JP7732151B2 - Manufacturing method of zinc phosphate treated steel sheet - Google Patents
Manufacturing method of zinc phosphate treated steel sheetInfo
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- JP7732151B2 JP7732151B2 JP2023200730A JP2023200730A JP7732151B2 JP 7732151 B2 JP7732151 B2 JP 7732151B2 JP 2023200730 A JP2023200730 A JP 2023200730A JP 2023200730 A JP2023200730 A JP 2023200730A JP 7732151 B2 JP7732151 B2 JP 7732151B2
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Description
本発明は、自動車、家電、建材等の用途に用いられるリン酸亜鉛処理鋼板の製造方法に関する。 The present invention relates to a method for manufacturing zinc phosphate-treated steel sheets for use in automobiles, home appliances, building materials, etc.
リン酸亜鉛系被膜を有する鋼板（以下、リン酸亜鉛処理鋼板と称す）は、プレス成形時の摺動抵抗が小さく、鋼板をプレス金型へ流入させやすいため、自動車車体用途を中心に用いられている。
リン酸亜鉛処理鋼板は、例えば、冷延鋼板上に亜鉛めっきを施した後、表面調整液を鋼板表面に吹き掛けリン酸亜鉛結晶の核となる物質を鋼板表面に散布した後、リン酸亜鉛処理を施してリン酸亜鉛被膜を形成させ製造される。リン酸亜鉛処理法としては、スプレー方式やコーター方式が挙げられる。
Steel sheets having a zinc phosphate coating (hereinafter referred to as zinc phosphate-treated steel sheets) are primarily used for automobile bodies because they have low sliding resistance during press forming and can be easily passed through press dies.
A zinc phosphate-treated steel sheet is produced, for example, by plating a cold-rolled steel sheet with zinc, spraying a surface conditioner onto the surface of the steel sheet, and scattering a substance that will become the nuclei of zinc phosphate crystals onto the surface of the steel sheet, followed by zinc phosphate treatment to form a zinc phosphate coating. Examples of zinc phosphate treatment methods include a spray method and a coater method.
ここで、鋼板表面において化成ムラ（絞りムラ）が発生する問題がある。特に、鋼板のリン酸亜鉛処理法としてスプレー方式やコーター方式等はいずれも反応型の化成処理被膜（リン酸亜鉛被膜）形成であるため、鋼板表面において化成ムラが発生しやすい。
この問題を解決するために、従来、例えば、特許文献１に示すリン酸亜鉛処理鋼板の製造方法が提案されている。
Here, there is a problem of chemical conversion unevenness (uneven drawing) occurring on the steel sheet surface. In particular, since the spray method, coater method, and other zinc phosphate treatment methods for steel sheet all form a reactive chemical conversion coating (zinc phosphate coating), chemical conversion unevenness is likely to occur on the steel sheet surface.
To solve this problem, a method for manufacturing a zinc phosphate-treated steel sheet has been proposed in the past, for example, as shown in Patent Document 1.
特許文献１に示すリン酸亜鉛処理鋼板の製造方法は、亜鉛めっき鋼板の表面上に表面調整液を塗布し表面調整処理を行った後、鋼板表面に吹き付け圧力：０．２０ＭＰａ以上で気体を吹き付け、次いで、リン酸亜鉛系処理液を鋼板表面に塗布することによりリン酸亜鉛被膜を形成するものである。 The method for manufacturing zinc phosphate-treated steel sheet described in Patent Document 1 involves applying a surface conditioning liquid to the surface of a zinc-plated steel sheet to perform a surface conditioning treatment, then spraying gas onto the steel sheet surface at a spray pressure of 0.20 MPa or more, and then applying a zinc phosphate-based treatment liquid to the steel sheet surface to form a zinc phosphate coating.
特許文献１に示すリン酸亜鉛処理鋼板の製造方法によれば、表面調整処理直後に鋼板表面に気体を吹き付けることにより表面調整液が鋼板表面に均一にレベリング（平滑化）され、その後のリン酸亜鉛被膜形成時において化成ムラが抑制される。その結果、表面性状に優れたリン酸亜鉛処理鋼板を製造することができる。 According to the method for manufacturing zinc phosphate-treated steel sheet shown in Patent Document 1, by spraying gas onto the steel sheet surface immediately after the surface conditioning treatment, the surface conditioning liquid is uniformly leveled (smoothed) over the steel sheet surface, thereby suppressing uneven chemical conversion during the subsequent formation of the zinc phosphate coating. As a result, zinc phosphate-treated steel sheet with excellent surface quality can be manufactured.
しかしながら、この従来の特許文献１に示すリン酸亜鉛処理鋼板の製造方法にあっては、鋼板の板厚が０．３ｍｍ～３．３ｍｍの鋼板に関して、表面調整液の飛散によってリン酸亜鉛被膜形成時における化成ムラが残存し、当該化成ムラを抑制する対策としては十分ではなかった。特に、鋼板の板厚が２．３ｍｍ以上の厚物材については、リン酸亜鉛被膜形成時における化成ムラが顕在化していた。 However, with the conventional manufacturing method of zinc phosphate-treated steel sheet shown in Patent Document 1, for steel sheets with a thickness of 0.3 mm to 3.3 mm, scattering of the surface conditioning liquid leaves unevenness in the chemical conversion during the formation of the zinc phosphate coating, and the method is not sufficient as a measure to suppress such unevenness. In particular, for thick steel sheets with a thickness of 2.3 mm or more, unevenness in the chemical conversion during the formation of the zinc phosphate coating becomes apparent.
従って、本発明はこの従来の課題を解決するためになされたものであり、その目的は、板厚が０．３ｍｍ以上３．３ｍｍ以下の亜鉛系めっき鋼板を下地としたリン酸亜鉛処理鋼板について、リン酸亜鉛被膜形成時における化成ムラを適切に抑制し、表面外観品質に優れたリン酸亜鉛処理鋼板とすることができるリン酸亜鉛処理鋼板の製造方法を提供することにある。 The present invention has been made to solve this problem, and its purpose is to provide a method for manufacturing zinc phosphate-treated steel sheet that can appropriately suppress chemical conversion unevenness during zinc phosphate coating formation and produce zinc phosphate-treated steel sheet with excellent surface appearance quality for zinc phosphate-treated steel sheet having a substrate of zinc-based plated steel sheet with a sheet thickness of 0.3 mm to 3.3 mm.
本発明者らは、表面調整処理直後の鋼板の表面の状態に着目し、化成ムラの発生原因と対策を検討した。その結果、鋼板のリン酸亜鉛処理法としてのスプレー方式やコーター方式等では、主に圧延工程で鋼板に生じた波状の形状に起因して表面調整液の膜厚がわずかに変動し、それがリン酸亜鉛被膜形成時において絞り不良による化成ムラを引き起こしていることを知見した。また、そのような鋼板に生じた波状の形状の影響は、板厚が０．３ｍｍ～３．３ｍｍの鋼板、特に板厚が２．３ｍｍ以上の厚物材において顕在化していることを知見した。 The inventors focused on the surface condition of steel sheets immediately after surface conditioning and investigated the causes of and countermeasures for chemical conversion unevenness. As a result, they discovered that when zinc phosphate treatment of steel sheets is performed using methods such as spraying and coating, slight variations in the film thickness of the surface conditioning solution occur mainly due to the wavy shape that develops on the steel sheet during the rolling process, which in turn causes chemical conversion unevenness due to poor drawing when the zinc phosphate coating is formed. They also discovered that the effects of such wavy shape on steel sheets are most apparent in steel sheets with a thickness of 0.3 mm to 3.3 mm, and particularly in thick materials with a thickness of 2.3 mm or more.
そこで、本発明者らは、表面調整処理後において、リン酸亜鉛処理の前に、リンガーロールによって鋼板を押圧し、表面調整液の膜厚を均一化し、化成ムラの解消を試みた。当初、リンガーロールの押し付け圧力を２．０ｋｇｆ／ｃｍ２程度から３．０ｋｇｆ／ｃｍ２未満程度としてリンガーロールによって鋼板を押圧した。これは、表面調整液の膜厚を均一化するという思想に基づくものであり、平坦な鋼板上の表面調整液の膜厚を均一化する場合には、それで十分であり、これ以上のリンガーロールの押し付け圧力としても、膜厚の均一化効果は飽和していたずらに荷重増加に伴う電力の増加を招くのみであった。 Therefore, the inventors attempted to eliminate the unevenness of the chemical conversion by pressing the steel sheet with a wringer roll after the surface conditioning treatment but before the zinc phosphate treatment to make the film thickness of the surface conditioning solution uniform. Initially, the steel sheet was pressed with the wringer roll at a pressing pressure of about 2.0 kgf/ cm2 to less than 3.0 kgf/ cm2 . This was based on the idea of making the film thickness of the surface conditioning solution uniform, and was sufficient when making the film thickness of the surface conditioning solution uniform on a flat steel sheet. However, if the pressing pressure of the wringer roll was higher than this, the film thickness uniformity effect was saturated and only resulted in an unnecessary increase in power due to the increased load.
しかしながら、化成ムラは、リンガーロールの押し付け圧力が２．０ｋｇｆ／ｃｍ２程度から３．０ｋｇｆ／ｃｍ２未満程度では、慢性的に発生しており、本発明者らが鋭意調査した結果、鋼板の形状は完全には平坦ではなく非平坦部で化成ムラが発生しやすく、また、化成ムラを抑制する最適なリンガーロールの押し付け圧力は、鋼板の板厚により決定づけられることを知見した。 However, when the pressing pressure of the wringer roll is from about 2.0 kgf/ cm2 to less than 3.0 kgf/ cm2 , chemical conversion unevenness occurs chronically. As a result of extensive research by the present inventors, it was found that the shape of the steel sheet is not completely flat, and chemical conversion unevenness is likely to occur in non-flat portions, and that the optimal pressing pressure of the wringer roll to suppress chemical conversion unevenness is determined by the sheet thickness of the steel sheet.
このため、上記課題を解決するために、本発明の一態様に係るリン酸亜鉛処理鋼板の製造方法は、板厚が０．３ｍｍ以上３．３ｍｍ以下の亜鉛系めっき鋼板を下地としたリン酸亜鉛処理鋼板の製造方法であって、前記亜鉛系めっき鋼板の表面上に表面調整液を塗布し表面調整処理を行う表面調整処理工程と、該表面調整処理工程の後、表面調整処理が施された前記亜鉛系めっき鋼板の表面にリンガーロールを押し付けて表面調整液の膜厚の均一化処理を行う膜厚均一化処理工程と、該膜厚均一化処理工程の後、リン酸亜鉛系処理液を表面調整液の膜厚均一化処理が施された前記亜鉛系めっき鋼板の表面に塗布することによりリン酸亜鉛被膜を形成するリン酸亜鉛処理工程とを含み、前記膜厚均一化処理工程においては、前記リンガーロールの前記亜鉛系めっき鋼板に対する押し付け圧力を、当該押し付け圧力をＰ［ｋｇｆ／ｃｍ２］、亜鉛系めっき鋼板の板厚をｔ［ｍｍ］としたとき、下記式の範囲に制御することを要旨とする。 Therefore, in order to solve the above-mentioned problems, one aspect of the present invention provides a method for producing a zinc phosphate-treated steel sheet using a zinc-based plated steel sheet having a thickness of 0.3 mm or more and 3.3 mm or less as a substrate, the method comprising: a surface conditioning step of applying a surface conditioning liquid to the surface of the zinc-based plated steel sheet to perform a surface conditioning step; a film thickness uniforming step of, after the surface conditioning step, pressing a wringer roll against the surface of the zinc-based plated steel sheet that has been subjected to the surface conditioning step to uniformize the film thickness of the surface conditioning liquid; and a zinc phosphate treatment step of, after the film thickness uniforming step, applying a zinc phosphate-based treatment liquid to the surface of the zinc-based plated steel sheet that has been subjected to the film thickness uniforming treatment with the surface conditioning liquid to form a zinc phosphate coating, wherein in the film thickness uniforming step, the pressing pressure of the wringer roll against the zinc-based plated steel sheet is controlled within the range of the following formula, where P [kgf/ cm2 ] is the pressing pressure and t [mm] is the thickness of the zinc-based plated steel sheet.
０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０ 0.27t 3 -0.90t 2 +1.60t+2.60≦P≦0.27t 3 -0.90t 2 +1.60t+3.60
本発明に係るリン酸亜鉛処理鋼板の製造方法によれば、板厚が０．３ｍｍ～３．３ｍｍの鋼板についてリン酸亜鉛被膜形成時における化成ムラを適切に抑制し、表面外観品質に優れたリン酸亜鉛処理鋼板とすることができる。 The manufacturing method for zinc phosphate-treated steel sheet according to the present invention can appropriately suppress chemical conversion unevenness during the formation of a zinc phosphate coating on steel sheets with a thickness of 0.3 mm to 3.3 mm, resulting in zinc phosphate-treated steel sheets with excellent surface appearance quality.
以下、本発明の実施の形態を図面を参照して説明する。以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。
また、図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components.
In addition, the drawings are schematic, and therefore it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual relationship, and the drawings may also contain parts where the relationship and ratio of dimensions differ from each other.
図１には、本発明の一実施形態に係るリン酸亜鉛処理鋼板の製造方法が適用される化成処理設備の概略構成が示されている。
図１に示す化成処理設備１は、電気亜鉛メッキラインに備えられ、冷間圧延後焼鈍を施した鋼板Ｓ上に電気めっき設備５０で亜鉛めっき等を施された亜鉛系めっき鋼板ＳＭに化成処理被膜（リン酸亜鉛被膜）を形成するものである。これにより、リン酸亜鉛処理鋼板が製造される。
FIG. 1 shows a schematic configuration of a chemical conversion treatment facility to which a method for producing a zinc phosphate-treated steel sheet according to one embodiment of the present invention is applied.
The chemical conversion treatment equipment 1 shown in Fig. 1 is provided in an electrogalvanizing line and forms a chemical conversion coating (zinc phosphate coating) on a zinc-based plated steel sheet S M , which has been subjected to zinc plating or the like in an electroplating equipment 50 on a steel sheet S that has been cold-rolled and then annealed. In this way, a zinc phosphate-treated steel sheet is produced.
ここで、化成処理が施される下地鋼板としての亜鉛系めっき鋼板ＳＭとしては、例えば、電気亜鉛めっきをした電気亜鉛めっき鋼板、電気亜鉛―ニッケル合金めっき鋼板などが挙げられる。また、亜鉛系めっき鋼板ＳＭは、電気めっき設備５０を経ていない溶融めっきした溶融亜鉛めっき鋼板であってもよい。また、鋼板は冷延鋼板であるが、熱延鋼板であってもよい。 Here, examples of the zinc-based plated steel sheet S M as the base steel sheet to be subjected to chemical conversion treatment include an electrogalvanized steel sheet that has been electroplated with zinc, an electrogalvanized zinc-nickel alloy plated steel sheet, etc. The zinc-based plated steel sheet S M may also be a hot-dip galvanized steel sheet that has been hot-dip plated without passing through the electroplating equipment 50. The steel sheet is a cold-rolled steel sheet, but may also be a hot-rolled steel sheet.
また、亜鉛系めっき鋼板ＳＭの板厚（鋼板Ｓの板厚）は、０．３ｍｍ以上とする。板厚が０．３ｍｍ未満では、板形状が波状になりにくく、本発明で対象とするリン酸亜鉛被膜形成時における化成ムラは生じ難い。一方、板厚が０．３ｍｍ以上では、波状の板形状不良が生じ、リン酸亜鉛処理法としてのスプレー方式やコーター方式ではリン酸亜鉛処理薬液の付着量の不均一性に起因してリン酸亜鉛被膜形成時における化成ムラにより表面外観不良が生じる。板厚が３．３ｍｍを超えると、本発明の方法（後述するリンガーロール２１の亜鉛系めっき鋼板ＳＭに対する押し付け圧力の設定）を採用しても板形状の矯正が不十分となり、表面外観不良は十分には改善されない。従って、亜鉛系めっき鋼板ＳＭの板厚（鋼板Ｓの板厚）を０．３ｍｍ以上３．３ｍｍ以下とした。 Furthermore, the thickness of the zinc-based plated steel sheet S (the thickness of the steel sheet S) is set to 0.3 mm or more. If the thickness is less than 0.3 mm, the sheet shape is less likely to become wavy, and the chemical conversion unevenness targeted by the present invention is less likely to occur during the formation of the zinc phosphate coating. On the other hand, if the thickness is 0.3 mm or more, a wavy sheet shape defect occurs, and in the case of a zinc phosphate treatment method using a spray or coater, the unevenness of the amount of zinc phosphate treatment solution applied causes chemical conversion unevenness during the formation of the zinc phosphate coating, resulting in poor surface appearance. If the thickness exceeds 3.3 mm, even if the method of the present invention (setting the pressing pressure of the wringer roll 21 against the zinc-based plated steel sheet S M described below) is adopted, the sheet shape is insufficient, and the poor surface appearance is not sufficiently improved. Therefore, the thickness of the zinc-based plated steel sheet S (the thickness of the steel sheet S) is set to 0.3 mm or more and 3.3 mm or less.
化成処理設備１は、表面調整処理装置１０と、膜厚均一化処理装置２０と、気体吹き付け装置３０と、リン酸亜鉛処理装置４０とを備えている。
表面調整処理装置１０は、亜鉛系めっき鋼板ＳＭの表面（上面及び下面）上に表面調整液を塗布し表面調整処理を行うものである。リン酸亜鉛処理装置４０でリン酸亜鉛処理を行う前に表面調整処理を行うことで、リン酸亜鉛処理時にリン酸亜鉛系処理液とめっきとの反応性を増大させることができる。
The chemical conversion treatment equipment 1 includes a surface conditioning treatment device 10, a film thickness uniforming treatment device 20, a gas blowing device 30, and a zinc phosphate treatment device 40.
The surface conditioning treatment device 10 performs surface conditioning treatment by applying a surface conditioning liquid to the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M. By performing the surface conditioning treatment before zinc phosphate treatment in the zinc phosphate treatment device 40, it is possible to increase the reactivity between the zinc phosphate treatment liquid and the plating during the zinc phosphate treatment.
表面調整処理装置１０は、表面調整液をスプレーする方法を用いており、上下で対をなす複数対の表面調整液吹き付けノズル１２を備えている。各対の表面調整液吹き付けノズル１２から亜鉛系めっき鋼板ＳＭの上面及び下面のそれぞれに表面調整液を吹き付け、亜鉛系めっき鋼板ＳＭの上面及び下面上に表面調整液を塗布する。なお、表面調整処理の方法としては、亜鉛系めっき鋼板ＳＭを表面調整液中に浸漬する方法であってもよい。 The surface conditioning treatment device 10 uses a method of spraying a surface conditioning liquid and is equipped with multiple pairs of upper and lower surface conditioning liquid spray nozzles 12. Each pair of surface conditioning liquid spray nozzles 12 sprays the surface conditioning liquid onto the upper and lower surfaces of the zinc-based plated steel sheet S M , respectively, to apply the surface conditioning liquid to the upper and lower surfaces of the zinc-based plated steel sheet S M. Note that the surface conditioning treatment method may also be a method of immersing the zinc-based plated steel sheet S M in the surface conditioning liquid.
ここで、表面調整液中には、Ｔｉコロイドを含有することが好ましい。表面調整液中にＴｉコロイドを含有させることで、Ｔｉコロイドは分散性が高いためその後のリン酸亜鉛処理時に反応核となりリン酸亜鉛被膜を形成することができる。
なお、表面調整処理装置１０において、表面調整液吹き付けノズル１２の上流側には搬送ロール１１が設置されている。
Here, it is preferable that the surface conditioning liquid contains Ti colloid, which has high dispersibility and serves as a reaction nucleus during the subsequent zinc phosphate treatment, allowing a zinc phosphate coating to be formed.
In the surface conditioning treatment device 10, a transport roll 11 is installed upstream of the surface conditioning liquid spray nozzle 12.
また、膜厚均一化処理装置２０は、表面調整処理装置１０の下流側に設置され、表面調整処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）にリンガーロール２１を押し付けて表面調整液の膜厚の均一化処理を行う。
膜厚均一化処理装置２０は、上下から亜鉛系めっき鋼板ＳＭを所定の押し付け圧力で押圧するリンガーロール２１を備えている。リンガーロール２１は、上下から亜鉛系めっき鋼板ＳＭを所定の押し付け圧力で押圧し、表面調整処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に存在する表面調整液の膜厚の均一化処理を行う。
The film thickness uniformization treatment device 20 is installed downstream of the surface conditioning treatment device 10, and performs a treatment to uniformize the film thickness of the surface conditioning solution by pressing a wringer roll 21 against the surface (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to the surface conditioning treatment.
The film thickness uniforming treatment device 20 is provided with wringer rolls 21 that press the zinc-based plated steel sheet S M from above and below with a predetermined pressing pressure. The wringer rolls 21 press the zinc-based plated steel sheet S M from above and below with a predetermined pressing pressure to uniformize the film thickness of the surface conditioning solution present on the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to surface conditioning treatment.
ここで、リンガーロール２１の亜鉛系めっき鋼板ＳＭに対する押し付け圧力は、当該押し付け圧力をＰ［ｋｇｆ／ｃｍ２］、亜鉛系めっき鋼板ＳＭの板厚をｔ［ｍｍ］としたとき、下記式の範囲に制御される。 Here, the pressing pressure of the wringer roll 21 against the zinc-based plated steel sheet S M is controlled within the range of the following formula, where the pressing pressure is P [kgf/cm 2 ] and the thickness of the zinc-based plated steel sheet S M is t [mm].
０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０ 0.27t 3 -0.90t 2 +1.60t+2.60≦P≦0.27t 3 -0.90t 2 +1.60t+3.60
ここで、リンガーロール２１の押し付け圧力Ｐ［ｋｇｆ／ｃｍ２］を、「０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０」未満とすると、表面調整液の液絞りが不十分となる。これにより、リン酸亜鉛処理装置４０によるリン酸亜鉛系処理液の塗布に際し、当該リン酸亜鉛系処理液の付着量が不均一となり、その不均一性に起因するリン酸亜鉛被膜形成時における化成ムラにより表面外観不良が生じる。これは、特に、亜鉛系めっき鋼板ＳＭの板厚が２．３ｍｍ以上の厚物材について、主に板形状が波状となる板形状不良が生じ、当該リン酸亜鉛系処理液の付着量の不均一性に起因するリン酸亜鉛被膜形成時における化成ムラが顕著となる。このため、リンガーロール２１の押し付け圧力Ｐ［ｋｇｆ／ｃｍ２］を、「０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０」以上として、表面調整液の液絞りを十分なものとし、リン酸亜鉛系処理液の塗布に際し、当該リン酸亜鉛系処理液の付着量を均一なものとし、当該リン酸亜鉛系処理液の付着量の不均一性に起因するリン酸亜鉛被膜形成時における化成ムラを防止している。一方、リンガーロール２１の押し付け圧力Ｐ［ｋｇｆ／ｃｍ２］を、「０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０」より大きくすると、過荷重によりリンガーロール２１が荒れたり、リンガーロール２１の荒れによりリンガーロール２１が荒れた状態で表面調整液が局所的に不均一な状態に均されることで梨肌状ムラと呼ばれるムラが鋼板表面に発生したりする。また、過荷重により過剰に表面調整液が液絞りされ、表面調整液が局所的に不均一な状態に均されることで化成ムラが発生する。リンガーロール２１の押し付け圧力Ｐ［ｋｇｆ／ｃｍ２］を、０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０とすると、亜鉛系めっき鋼板ＳＭの板厚ｔに応じて亜鉛系めっき鋼板ＳＭの波状形状が矯正され、表面調整液の液絞りが適切になされて鋼板表面に付着する表面調整液の付着量がレベリングされる。これにより、リン酸亜鉛系処理液の塗布に際し、当該リン酸亜鉛系処理液の付着量が均一化し、リン酸亜鉛被膜形成時における化成ムラを改善することができる。このため、本実施形態においては、リンガーロール２１の押し付け圧力Ｐ［ｋｇｆ／ｃｍ２］を、０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０とした。 If the pressing pressure P [kgf/cm 2 ] of the wringer roll 21 is less than "0.27t 3 - 0.90t 2 + 1.60t + 2.60," the surface conditioning solution will not be sufficiently squeezed out. As a result, when the zinc phosphate treatment solution is applied by the zinc phosphate treatment device 40, the amount of zinc phosphate treatment solution deposited will be non-uniform, and this non-uniformity will cause uneven chemical conversion during zinc phosphate coating formation, resulting in poor surface appearance. This is particularly true for thick zinc-plated steel sheets S M having a thickness of 2.3 mm or more, where poor sheet shape, primarily wavy, occurs, and the uneven chemical conversion during zinc phosphate coating formation due to the non-uniformity of the amount of zinc phosphate treatment solution deposited will be significant. Therefore, the pressing pressure P [kgf/cm 2 ] of the wringer roll 21 is set to be equal to or greater than "0.27t 3 - 0.90t 2 + 1.60t + 2.60", which ensures sufficient wringing of the surface conditioner, ensures a uniform amount of zinc phosphate treatment solution when applied, and prevents uneven chemical conversion during formation of the zinc phosphate coating due to unevenness in the amount of zinc phosphate treatment solution applied. On the other hand, if the pressing pressure P [kgf/cm 2 ] of the wringer roll 21 is set to be greater than "0.27t 3 - 0.90t 2 + 1.60t + 3.60", the wringer roll 21 may become rough due to excessive load, or the rough wringer roll 21 may cause the surface conditioner to be locally leveled out unevenly, resulting in unevenness known as pear skin on the steel sheet surface. Furthermore, excessive load causes excessive squeezing of the surface conditioner, resulting in locally uneven leveling of the surface conditioner, resulting in uneven chemical conversion. When the pressing pressure P [kgf/cm 2 ] of the wringer roll 21 is set to 0.27t 3 - 0.90t 2 + 1.60t + 2.60≦P≦0.27t 3 - 0.90t 2 + 1.60t + 3.60, the wavy shape of the zinc-based plated steel sheet S M is corrected according to the sheet thickness t of the zinc-based plated steel sheet S M , the surface conditioner is appropriately squeezed out, and the amount of surface conditioner adhering to the steel sheet surface is leveled. This ensures that the amount of zinc phosphate-based treatment solution applied is uniform, thereby improving uneven chemical conversion during the formation of a zinc phosphate coating. Therefore, in this embodiment, the pressing pressure P [kgf/cm 2 ] of the wringer roll 21 is set to 0.27t 3 - 0.90t 2 + 1.60t + 2.60≦P≦0.27t 3 - 0.90t 2 + 1.60t + 3.60.
また、気体吹き付け装置３０は、膜厚均一化処理装置２０の下流側に設置され、表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に気体を吹き付ける。これにより、表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）の表面調整液が更に均一にレベリング（平滑化）される。このため、リン酸亜鉛系処理液の付着量の不均一性に起因するリン酸亜鉛被膜形成時における化成ムラをより抑制することができる。 The gas blowing device 30 is installed downstream of the film thickness uniforming treatment device 20 and blows gas onto the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been treated for film thickness uniformity with the surface conditioner. This further uniformly levels (smooths) the surface conditioner on the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been treated for film thickness uniformity with the surface conditioner. This makes it possible to further suppress uneven chemical conversion during the formation of a zinc phosphate coating that is caused by unevenness in the amount of zinc phosphate-based treatment solution applied.
気体吹き付け装置３０は、上下で対をなす気体吹き付けノズル３１を備えている。対の気体吹き付けノズル３１から亜鉛系めっき鋼板ＳＭの上面及び裏面のそれぞれに気体を吹き付ける。
気体吹き付けノズル３１からの亜鉛系めっき鋼板ＳＭの上面及び裏面への気体の吹き付け圧力は、０．２０ＭＰａ以上、特に０．３０ＭＰａ以上０．４０ＭＰａ以下であることが好ましい。
The gas blowing device 30 is provided with a pair of upper and lower gas blowing nozzles 31. Gas is blown from the pair of gas blowing nozzles 31 onto the top and back surfaces of the zinc-based plated steel sheet SM .
The pressure of the gas blown from the gas blowing nozzle 31 onto the top and back surfaces of the zinc-based plated steel sheet SM is preferably 0.20 MPa or more, particularly 0.30 MPa or more and 0.40 MPa or less.
また、気体吹き付けノズル３１から亜鉛系めっき鋼板ＳＭの上面及び裏面へ吹き付けられる気体は、表面調整液の表面調整機能に実用上の影響を及ぼさない気体であれば適用可能であり、例えば、空気、窒素、ヘリウム、アルゴン等が使用可能である。
また、リン酸亜鉛処理装置４０は、気体吹き付け装置３０の下流側に設置され、リン酸亜鉛系処理液を表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に塗布することによりリン酸亜鉛被膜を形成する。
Furthermore, the gas sprayed from the gas spraying nozzle 31 onto the top and back surfaces of the zinc-based plated steel sheet SM can be any gas that does not have a practical effect on the surface conditioning function of the surface conditioning liquid, and for example, air, nitrogen, helium, argon, etc. can be used.
The zinc phosphate treatment device 40 is installed downstream of the gas spraying device 30, and forms a zinc phosphate coating by applying a zinc phosphate-based treatment solution to the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to a film thickness uniformization treatment with a surface conditioning solution.
リン酸亜鉛処理装置４０は、リン酸亜鉛系処理液をスプレーする方法を用いており、上下で対をなす複数対のリン酸亜鉛系処理液吹き付けノズル４２を備えている。各対のリン酸亜鉛系処理液吹き付けノズル４２から亜鉛系めっき鋼板ＳＭの上面及び下面のそれぞれにリン酸亜鉛系処理液を吹き付け、亜鉛系めっき鋼板ＳＭの上面及び下面上にリン酸亜鉛系処理液を塗布する。なお、リン酸亜鉛処理法としては、前述のスプレー方式の他、コーター方式であってもよい。 The zinc phosphate treatment device 40 uses a method of spraying a zinc phosphate-based treatment solution, and is equipped with multiple pairs of upper and lower zinc phosphate-based treatment solution spray nozzles 42. The zinc phosphate-based treatment solution is sprayed from each pair of zinc phosphate-based treatment solution spray nozzles 42 onto the upper and lower surfaces of the zinc-based plated steel sheet S M , respectively, to coat the upper and lower surfaces of the zinc-based plated steel sheet S M. Note that the zinc phosphate treatment method may be a coater method in addition to the spray method described above.
ここで、リン酸亜鉛系処理液としては、特に限定はしない。通常用いられているリン酸亜鉛系処理液を用いることができる。Ｚｎイオン、リン酸イオンの他に硝酸イオン、Ｆ化合物等を含有するものを用いることができる。Ｎｉ，Ｍｎ，Ｍｇ，Ｃｏ，Ｃｕ等を含有させることもできる。 The zinc phosphate-based treatment solution is not particularly limited. Any commonly used zinc phosphate-based treatment solution can be used. It can contain nitrate ions, F compounds, etc. in addition to Zn ions and phosphate ions. It can also contain Ni, Mn, Mg, Co, Cu, etc.
なお、リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２以上３．０ｇ／ｍ２以下とすることが好ましい。リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２未満では、リン酸亜鉛結晶が粗大化し、耐食性の低下や外観不良を招くおそれがある。一方、リン酸亜鉛系処理液の塗布量が３．０ｇ／ｍ２を超えると、リン酸亜鉛処理鋼板の成形性やリン酸亜鉛被膜の密着性が低下する。このため、本実施形態においては、リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２以上３．０ｇ／ｍ２以下とした。 The amount of zinc phosphate-based treatment liquid applied is preferably 1.0 g/ m2 or more and 3.0 g/ m2 or less. If the amount of zinc phosphate-based treatment liquid applied is less than 1.0 g/ m2 , the zinc phosphate crystals may become coarse, which may result in reduced corrosion resistance and poor appearance. On the other hand, if the amount of zinc phosphate-based treatment liquid applied exceeds 3.0 g/ m2 , the formability of the zinc phosphate-treated steel sheet and the adhesion of the zinc phosphate coating may decrease. For this reason, in this embodiment, the amount of zinc phosphate-based treatment liquid applied is set to 1.0 g/ m2 or more and 3.0 g/ m2 or less.
なお、リン酸亜鉛処理装置４０において、リン酸亜鉛系処理液吹き付けノズル４２の上流側には搬送ロール４１が設置され、リン酸亜鉛系処理液吹き付けノズル４２の下流側には搬送ロール４３が設置されている。
リン酸亜鉛処理装置４０によってリン酸亜鉛被膜が形成された亜鉛系めっき鋼板ＳＭは、後工程に供され、リン酸亜鉛処理鋼板が製造される。
In the zinc phosphate treatment device 40, a transport roll 41 is provided upstream of the zinc phosphate treatment liquid spray nozzle 42, and a transport roll 43 is provided downstream of the zinc phosphate treatment liquid spray nozzle 42.
The zinc-based plated steel sheet SM on which the zinc phosphate coating has been formed by the zinc phosphate treatment device 40 is subjected to subsequent processes to produce a zinc phosphate-treated steel sheet.
次に、本発明の一実施形態に係るリン酸亜鉛処理鋼板の製造方法を表す化成処理設備における処理の流れを、図２に示すフローチャートを参照して説明する。図２は、図１に示す化成処理設備における処理の流れを説明するためのフローチャートである。 Next, the process flow in the chemical conversion treatment equipment, which represents a method for producing zinc phosphate-treated steel sheet according to one embodiment of the present invention, will be described with reference to the flowchart shown in Figure 2. Figure 2 is a flowchart for explaining the process flow in the chemical conversion treatment equipment shown in Figure 1.
先ず、化成処理設備１によって化成処理を行う前に、冷間圧延後焼鈍を施した鋼板Ｓが電気めっき設備５０において亜鉛めっき等を施される。そして、亜鉛めっき等を施された亜鉛系めっき鋼板ＳＭは、化成処理設備１によって化成処理が施される。 First, before chemical conversion treatment is performed in the chemical conversion treatment facility 1, the steel sheet S that has been cold rolled and then annealed is subjected to zinc plating or the like in the electroplating facility 50. Then, the zinc-based plated steel sheet S M that has been subjected to zinc plating or the like is subjected to chemical conversion treatment in the chemical conversion treatment facility 1.
亜鉛系めっき鋼板ＳＭの板厚は、０．３ｍｍ以上３．３ｍｍ以下である。板厚が０．３ｍｍ未満では、板形状が波状になりにくく、本発明で対象とするリン酸亜鉛被膜形成時における化成ムラは生じ難い。一方、板厚が０．３ｍｍ以上では、波状の板形状不良が生じ、リン酸亜鉛処理法としてのスプレー方式やコーター方式ではリン酸亜鉛処理薬液の付着量の不均一性に起因してリン酸亜鉛被膜形成時における化成ムラにより表面外観不良が生じる。板厚が３．３ｍｍを超えると、本発明の方法（後述するリンガーロール２１の亜鉛系めっき鋼板ＳＭに対する押し付け圧力の設定）を採用しても板形状の矯正が不十分となり、表面外観不良は十分には改善されない。従って、亜鉛系めっき鋼板ＳＭの板厚（鋼板Ｓの板厚）を０．３ｍｍ以上３．３ｍｍ以下とした。 The thickness of the zinc-based plated steel sheet S M is 0.3 mm or more and 3.3 mm or less. If the thickness is less than 0.3 mm, the sheet shape is less likely to become wavy, and the chemical conversion unevenness that is the target of the present invention is less likely to occur during the formation of the zinc phosphate coating. On the other hand, if the thickness is 0.3 mm or more, a wavy sheet shape defect occurs, and in the case of zinc phosphate treatment methods using a spray or coater method, the uneven amount of zinc phosphate treatment solution applied causes chemical conversion unevenness during the formation of the zinc phosphate coating, resulting in poor surface appearance. If the thickness exceeds 3.3 mm, even if the method of the present invention (setting the pressing pressure of the wringer roll 21 against the zinc-based plated steel sheet S M described below) is adopted, the sheet shape is insufficient, and the poor surface appearance is not sufficiently improved. Therefore, the thickness of the zinc-based plated steel sheet S M (the thickness of the steel sheet S) is set to 0.3 mm or more and 3.3 mm or less.
化成処理設備１における化成処理においては、亜鉛系めっき鋼板ＳＭは表面調整処理装置１０に搬送され、先ず、ステップＳ１において、表面調整処理装置１０が、亜鉛系めっき鋼板ＳＭの表面（上面及び下面）上に表面調整液を塗布し表面調整処理を行う（表面調整処理工程）。 In the chemical conversion treatment in the chemical conversion treatment equipment 1, the zinc-based plated steel sheet S M is transported to the surface conditioning treatment device 10, and first, in step S1, the surface conditioning treatment device 10 applies a surface conditioning liquid to the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M to perform surface conditioning treatment (surface conditioning treatment step).
次いで、ステップＳ２において、ステップＳ１の後、膜厚均一化処理装置２０が、表面調整処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）にリンガーロール２１を押し付けて表面調整液の膜厚の均一化処理を行う（膜厚均一化処理工程）。 Next, in step S2, after step S1, the film thickness uniformizing treatment device 20 presses the wringer roll 21 against the surface (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to the surface conditioning treatment, thereby performing a treatment to uniformize the film thickness of the surface conditioning solution (film thickness uniformizing treatment step).
そして、この膜厚均一化処理工程においては、リンガーロール２１の亜鉛系めっき鋼板ＳＭに対する押し付け圧力を、当該押し付け圧力をＰ［ｋｇｆ／ｃｍ２］、亜鉛系めっき鋼板ＳＭの板厚をｔ［ｍｍ］としたとき、前述の式の範囲に制御する。 In this film thickness uniformization process, the pressing pressure of the wringer roll 21 against the zinc-based plated steel sheet S M is controlled within the range of the above-mentioned formula, where the pressing pressure is P [kgf/cm 2 ] and the thickness of the zinc-based plated steel sheet S M is t [mm].
これにより、亜鉛系めっき鋼板ＳＭの板厚ｔに応じて亜鉛系めっき鋼板ＳＭの波状形状が矯正され、表面調整液の液絞りが適切になされて鋼板表面に付着する表面調整液の付着量がレベリングされる。これにより、リン酸亜鉛系処理液の塗布に際し、当該リン酸亜鉛系処理液の付着量が均一化し、リン酸亜鉛被膜形成時における化成ムラを改善することができる。このため、板厚が０．３ｍｍ以上３．３ｍｍ以下の亜鉛系めっき鋼板ＳＭを下地としたリン酸亜鉛処理鋼板について、リン酸亜鉛被膜形成時における化成ムラを適切に抑制し、表面外観品質に優れたリン酸亜鉛処理鋼板とすることができる。 This straightens out the wavy shape of the zinc-based plated steel sheet S M in accordance with the thickness t of the zinc-based plated steel sheet S M , and appropriately squeezes out the surface conditioner, leveling the amount of the surface conditioner that adheres to the steel sheet surface. This makes it possible to uniformize the amount of the zinc phosphate-based treatment solution that adheres when the zinc phosphate-based treatment solution is applied, and improves chemical conversion unevenness during zinc phosphate coating formation. Therefore, for a zinc phosphate-treated steel sheet having a base of zinc-based plated steel sheet S M with a thickness of 0.3 mm or more and 3.3 mm or less, chemical conversion unevenness during zinc phosphate coating formation can be appropriately suppressed, resulting in a zinc phosphate-treated steel sheet with excellent surface appearance quality.
次いで、ステップＳ３において、ステップＳ２の後、気体吹き付け装置３０が、表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に気体を吹き付ける（気体吹き付け工程）。 Next, in step S3, after step S2, the gas blowing device 30 blows gas onto the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet SM that has been subjected to the film thickness uniformization treatment with the surface conditioning liquid (gas blowing process).
これにより、表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）の表面調整液が更に均一にレベリング（平滑化）される。このため、リン酸亜鉛系処理液の付着量の不均一性に起因するリン酸亜鉛被膜形成時における化成ムラをより抑制することができる。 This allows the surface conditioning liquid to be more uniformly leveled (smoothed) on the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to a film thickness uniformization treatment with the surface conditioning liquid, thereby further suppressing chemical conversion unevenness during zinc phosphate coating formation that is caused by non-uniformity in the amount of zinc phosphate-based treatment liquid applied.
次いで、ステップＳ４において、ステップＳ３の後、リン酸亜鉛処理装置４０が、リン酸亜鉛系処理液を表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に塗布することによりリン酸亜鉛被膜を形成する（リン酸亜鉛処理工程）。 Next, in step S4, after step S3, the zinc phosphate treatment device 40 applies a zinc phosphate-based treatment solution to the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that has been subjected to the film thickness uniformization treatment with the surface conditioning solution, thereby forming a zinc phosphate coating (zinc phosphate treatment step).
ここで、リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２以上３．０ｇ／ｍ２以下とすることが好ましい。リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２未満では、リン酸亜鉛結晶が粗大化し、耐食性の低下や外観不良を招くおそれがある。一方、リン酸亜鉛系処理液の塗布量が３．０ｇ／ｍ２を超えると、リン酸亜鉛処理鋼板の成形性やリン酸亜鉛被膜の密着性が低下する。このため、本実施形態においては、リン酸亜鉛系処理液の塗布量は１．０ｇ／ｍ２以上３．０ｇ／ｍ２以下とした。 Here, the amount of zinc phosphate-based treatment liquid applied is preferably 1.0 g/ m2 or more and 3.0 g/ m2 or less. If the amount of zinc phosphate-based treatment liquid applied is less than 1.0 g/ m2 , the zinc phosphate crystals may become coarse, which may result in reduced corrosion resistance and poor appearance. On the other hand, if the amount of zinc phosphate-based treatment liquid applied exceeds 3.0 g/ m2 , the formability of the zinc phosphate-treated steel sheet and the adhesion of the zinc phosphate coating will decrease. For this reason, in this embodiment, the amount of zinc phosphate-based treatment liquid applied is set to 1.0 g/ m2 or more and 3.0 g/ m2 or less.
これにより、化成処理設備１における処理が終了し、リン酸亜鉛被膜が形成された亜鉛系めっき鋼板ＳＭは、後工程に供され、リン酸亜鉛処理鋼板が製造される。
以上、本発明の実施形態について説明してきたが、本発明はこれに限定されずに種々の変更、改良を行うことができる。
This completes the treatment in the chemical conversion treatment equipment 1, and the zinc-based plated steel sheet SM on which the zinc phosphate coating has been formed is then subjected to subsequent steps to produce a zinc phosphate-treated steel sheet.
Although the embodiment of the present invention has been described above, the present invention is not limited to this and various modifications and improvements can be made.
例えば、気体吹き付け装置３０及び気体吹き付け工程（ステップＳ３）を省略し、膜厚均一化処理装置２０で膜厚均一化処理（ステップＳ２）を行った直後にリン酸亜鉛処理装置４０でリン酸亜鉛処理（ステップＳ４）を行うようにしてもよい。この場合でも、亜鉛系めっき鋼板ＳＭの板厚ｔに応じて鋼板ＳＭの波状形状が矯正され、表面調整液の液絞りが適切になされて鋼板表面に付着する表面調整液の付着量がレベリングされる。これにより、リン酸亜鉛系処理液の塗布に際し、当該リン酸亜鉛系処理液の付着量が均一化し、リン酸亜鉛被膜形成時における化成ムラを改善することができる。これにより、板厚が０．３ｍｍ～３．３ｍｍのリン酸亜鉛処理鋼板についてリン酸亜鉛被膜形成時における化成ムラを適切に抑制し、表面外観品質に優れたリン酸亜鉛処理鋼板とすることができる。 For example, the gas blowing device 30 and the gas blowing process (step S3) may be omitted, and the zinc phosphate treatment (step S4) may be performed in the zinc phosphate treatment device 40 immediately after the film thickness uniformization treatment (step S2) in the film thickness uniformization treatment device 20. Even in this case, the corrugated shape of the steel sheet S M is corrected according to the thickness t of the zinc-based plated steel sheet S M , and the surface conditioner is appropriately squeezed out to level the amount of surface conditioner adhered to the steel sheet surface. This allows the amount of zinc phosphate treatment solution to be uniform when the zinc phosphate treatment solution is applied, thereby improving chemical conversion unevenness during zinc phosphate coating formation. This appropriately suppresses chemical conversion unevenness during zinc phosphate coating formation for zinc phosphate-treated steel sheets with a thickness of 0.3 mm to 3.3 mm, resulting in a zinc phosphate-treated steel sheet with excellent surface appearance quality.
冷間圧延後焼鈍を施した板厚０．８ｍｍ、２．３ｍｍ、３．０ｍｍの鋼板Ｓ上に、電気めっき設備５０にて片面当たり付着量１８ｇ／ｍ２、すなわち両面合計の付着量が３６ｇ／ｍ２となるように電気亜鉛めっきを施した。
次いで、表面調整処理装置１０によって、電気亜鉛めっきを施した亜鉛系めっき鋼板ＳＭの表面（上面及び下面）上に表面調整液（チタンコロイド系処理液、日本パーカライジング（株）製ＰＬ－ＺＮ３．０ｇ／ｌ）を塗布することにより表面調整処理を行った。
Steel sheets S having thicknesses of 0.8 mm, 2.3 mm, and 3.0 mm that had been cold-rolled and then annealed were electrogalvanized in electroplating equipment 50 to a coating weight of 18 g/m 2 per side, i.e., a total coating weight of 36 g/m 2 on both sides.
Next, a surface conditioning solution (titanium colloid-based treatment solution, PL-ZN 3.0 g/l manufactured by Nippon Parkerizing Co., Ltd.) was applied to the surfaces (upper and lower surfaces) of the electrogalvanized zinc-based plated steel sheet S M using the surface conditioning treatment device 10, thereby carrying out a surface conditioning treatment.
次いで、膜厚均一化処理装置２０によって、表面調整処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）にリンガーロール２１を表２に示す押し付け圧力で押し付けて表面調整液の膜厚の均一化処理を行った。表２において「押し付け圧力の範囲」は、各板厚に対して前述の式で計算される数値範囲である。
次いで、気体吹き付け装置３０によって、表面調整液の膜厚均一化処理が施された亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に気体を吹き付けた。気体吹き付け装置３０の気体吹き付けノズル３１としてはスリット状のノズルを用いた。
Next, a film thickness uniformization treatment was performed by pressing a wringer roll 21 against the surface (upper and lower surfaces) of the zinc-based plated steel sheet S M that had been subjected to the surface conditioning treatment using a film thickness uniformization treatment device 20, with the pressing pressure shown in Table 2. In Table 2, the "pressing pressure range" is the numerical range calculated by the above-mentioned formula for each sheet thickness.
Next, gas was sprayed onto the surfaces (upper and lower surfaces) of the zinc-based plated steel sheet S M that had been subjected to the film thickness uniformization treatment with the surface conditioning liquid by using the gas spraying device 30. A slit-shaped nozzle was used as the gas spraying nozzle 31 of the gas spraying device 30.
次いで、リン酸亜鉛処理装置４０によって、表１に示す浴組成からなるリン酸亜鉛系処理液を亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に塗布することによりリン酸亜鉛被膜を形成し、リン酸亜鉛処理鋼板を製造した。リン酸亜鉛系処理液の塗布量は表２に示す通りである。リン酸亜鉛処理装置４０においては、スプレー方式を用い、リン酸亜鉛系処理液吹き付けノズル４２によってリン酸亜鉛系処理液を亜鉛系めっき鋼板ＳＭの表面（上面及び下面）に吹き付けた。 Next, a zinc phosphate coating was formed by applying a zinc phosphate-based treatment solution having the bath composition shown in Table 1 to the surfaces (upper and lower surfaces) of the zinc-plated steel sheets S M using a zinc phosphate treatment device 40, thereby producing zinc phosphate-treated steel sheets. The amount of zinc phosphate-based treatment solution applied was as shown in Table 2. In the zinc phosphate treatment device 40, a spray system was used, and the zinc phosphate-based treatment solution was sprayed onto the surfaces (upper and lower surfaces) of the zinc-plated steel sheets S M using a zinc phosphate-based treatment solution spraying nozzle 42.
以上により得られたリン酸亜鉛処理鋼板に対して、鋼板表面のムラを目視にて観察し、梨肌状ムラ、絞り不良ムラの有無を確認した。ここで、梨肌状ムラとは、リンガーロール２１の荒れによりリンガーロール２１が荒れた状態で表面調整液が局所的に不均一な状態に均されることで発生するムラである。この梨肌状ムラは、リンガーロール２１の押し付け圧力Ｐが前述の式で決定される押し付け圧力の上限値（すなわち前述の式の右辺の値）を超えると発生しやすい。また、絞り不良ムラとは、リンガーロール２１が表面調整液を絞り切れずに、鋼板上の一部の表面調整液がそのまますり抜け、リン酸亜鉛系処理液の付着量が不均一化し、リン酸亜鉛被膜形成時において発生する化成ムラである。この絞り不良ムラは、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（すなわち前述の式の左辺の値）未満であると発生しやすい。 The zinc phosphate-treated steel sheets obtained in this manner were visually inspected for surface irregularities, and the presence or absence of pear-skin irregularities and poor drawing irregularities was confirmed. Here, pear-skin irregularities are irregularities that occur when the surface conditioner is locally leveled unevenly due to roughness of the wringer roll 21. This pear-skin irregularity is likely to occur when the pressing pressure P of the wringer roll 21 exceeds the upper limit of the pressing pressure determined by the above-mentioned equation (i.e., the value on the right side of the above-mentioned equation). Poor drawing irregularities are irregularities in the chemical conversion that occur when the zinc phosphate coating is formed, as the wringer roll 21 is unable to completely squeeze out the surface conditioner, causing some of the surface conditioner to slip through, resulting in uneven adhesion of the zinc phosphate-based treatment solution. This poor drawing irregularity is likely to occur when the pressing pressure P of the wringer roll 21 is below the lower limit of the pressing pressure in the above-mentioned equation (i.e., the value on the left side of the above-mentioned equation).
以上により得られた結果を条件とともに表２に示す。 The results obtained above, along with the conditions, are shown in Table 2.
表２では、各ムラの判定において、○は均一でムラなし、×はムラありである。すべての評価結果がすべて○の場合を合格とした。
表２より、板厚が０．８ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを２．８ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．１）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（３．４ｋｇｆ／ｃｍ２）未満となっており、比較例を構成し、絞り不良ムラが発生した。
In Table 2, for the evaluation of each type of unevenness, ◯ means uniform and no unevenness, and × means there is unevenness. When all the evaluation results were ◯, the product was deemed to have passed.
As can be seen from Table 2, when the pressing pressure P of the wringer roll 21 was set to 2.8 kgf/ cm2 for a zinc-based plated steel sheet S M having a sheet thickness of 0.8 mm (Test No. 1), the pressing pressure P of the wringer roll 21 was less than the lower limit value (3.4 kgf/ cm2 ) of the pressing pressure in the above formula, which constituted a comparative example, and poor drawing unevenness occurred.
また、板厚が０．８ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを３．２ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．２）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（３．４ｋｇｆ／ｃｍ２）未満となっており、比較例を構成し、絞り不良ムラが発生した。
また、板厚が０．８ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを５．０ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．４）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の上限値（４．４ｋｇｆ／ｃｍ２）を超えており、比較例を構成し、梨肌状ムラが発生した。
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 3.2 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 0.8 mm (Test No. 2), the pressing pressure P of the wringer roll 21 was less than the lower limit value (3.4 kgf/ cm2 ) of the pressing pressure in the above formula, which constituted a comparative example, and poor drawing unevenness occurred.
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 5.0 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 0.8 mm (Test No. 4), the pressing pressure P of the wringer roll 21 exceeded the upper limit of the pressing pressure (4.4 kgf/ cm2 ) in the above formula, which constituted a comparative example, and pear-skin unevenness occurred.
一方、板厚が０．８ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを４．０ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．３）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の範囲（３．４～４．４ｋｇｆ／ｃｍ２）内であり、本発明例を構成し、梨肌状ムラ及び絞り不良ムラが発生せず、合格となった。
また、板厚が２．３ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを４．５ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．５）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（４．８ｋｇｆ／ｃｍ２）未満となっており、比較例を構成し、絞り不良ムラが発生した。
On the other hand, when the pressing pressure P of the wringer roll 21 was set to 4.0 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 0.8 mm (Test No. 3), the pressing pressure P of the wringer roll 21 was within the range of pressing pressure in the above formula (3.4 to 4.4 kgf/ cm2 ), which constituted an example of the present invention, and no pear-skin unevenness or poor drawing unevenness occurred, resulting in a pass.
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 4.5 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 2.3 mm (Test No. 5), the pressing pressure P of the wringer roll 21 was less than the lower limit value (4.8 kgf/ cm2 ) of the pressing pressure in the above formula, which constituted a comparative example, and poor drawing unevenness occurred.
また、板厚が２．３ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを６．５ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．７）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の上限値（５．８ｋｇｆ／ｃｍ２）を超えており、比較例を構成し、梨肌状ムラが発生した。
一方、板厚が２．３ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを５．５ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．６）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の範囲（４．８～５．８ｋｇｆ／ｃｍ２）内であり、本発明例を構成し、梨肌状ムラ及び絞り不良ムラが発生せず、合格となった。
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 6.5 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 2.3 mm (Test No. 7), the pressing pressure P of the wringer roll 21 exceeded the upper limit of the pressing pressure (5.8 kgf/ cm2 ) in the above formula, which constituted a comparative example, and pear-skin unevenness occurred.
On the other hand, when the pressing pressure P of the wringer roll 21 was set to 5.5 kgf/ cm2 for a zinc-based plated steel sheet S M having a sheet thickness of 2.3 mm (Test No. 6), the pressing pressure P of the wringer roll 21 was within the pressing pressure range (4.8 to 5.8 kgf/ cm2 ) in the above formula, which constituted an example of the present invention, and no pear-skin unevenness or poor drawing unevenness occurred, resulting in a pass.
また、板厚が３．０ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを４．５ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．８）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（６．６ｋｇｆ／ｃｍ２）未満となっており、比較例を構成し、絞り不良ムラが発生した。
また、板厚が３．０ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを６．０ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．９）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の下限値（６．６ｋｇｆ／ｃｍ２）未満となっており、比較例を構成し、絞り不良ムラが発生した。
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 4.5 kgf/ cm2 for a zinc-based plated steel sheet S M having a thickness of 3.0 mm (Test No. 8), the pressing pressure P of the wringer roll 21 was less than the lower limit value (6.6 kgf/ cm2 ) of the pressing pressure in the above formula, which constituted a comparative example, and poor drawing unevenness occurred.
Furthermore, when the pressing pressure P of the wringer roll 21 was set to 6.0 kgf/ cm2 for a zinc-based plated steel sheet S M having a sheet thickness of 3.0 mm (Test No. 9), the pressing pressure P of the wringer roll 21 was less than the lower limit value (6.6 kgf/ cm2 ) of the pressing pressure in the above formula, which constituted a comparative example, and poor drawing unevenness occurred.
一方、板厚が３．０ｍｍの亜鉛系めっき鋼板ＳＭに対してリンガーロール２１の押し付け圧力Ｐを７．０ｋｇｆ／ｃｍ２とした場合（試験Ｎｏ．１０）、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の範囲（６．６～７．５ｋｇｆ／ｃｍ２）内であり、本発明例を構成し、梨肌状ムラ及び絞り不良ムラが発生せず、合格となった。 On the other hand, when the pressing pressure P of the wringer roll 21 was set to 7.0 kgf/ cm2 for a zinc-based plated steel sheet S M having a sheet thickness of 3.0 mm (Test No. 10), the pressing pressure P of the wringer roll 21 was within the pressing pressure range (6.6 to 7.5 kgf/ cm2 ) in the above formula, which constituted an example of the present invention, and no pear-skin unevenness or poor drawing unevenness occurred, resulting in a pass.
なお、これら試験Ｎｏ．１～１０では、亜鉛系めっき鋼板ＳＭの板厚が０．８ｍｍ、２．３ｍｍ、３．０ｍｍに限定されているが、亜鉛系めっき鋼板ＳＭの板厚が０．３ｍｍ～３．３ｍｍの範囲内のいずれの板厚の場合でも、良好な結果が得られることが確認されている。
また、リンガーロール２１の押し付け圧力Ｐが前述の式における押し付け圧力の範囲（０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０）内とした場合、梨肌状ムラ及び絞り不良ムラのすべてのムラによる歩留り率は０．０３％向上したことが確認されている。
In these Test Nos. 1 to 10, the thicknesses of the zinc-based plated steel sheets S to M are limited to 0.8 mm, 2.3 mm, and 3.0 mm, but it has been confirmed that good results can be obtained even when the thickness of the zinc-based plated steel sheets S to M is any thickness within the range of 0.3 mm to 3.3 mm.
Furthermore, when the pressing pressure P of the wringer roll 21 is within the range of pressing pressure in the above formula (0.27t 3 - 0.90t 2 + 1.60t + 2.60≦P≦0.27t 3 - 0.90t 2 + 1.60t + 3.60), it has been confirmed that the yield rate for all types of unevenness, including pear-skin unevenness and poor squeezing unevenness, is improved by 0.03%.
１ 化成処理設備
１０ 表面調整処理装置
１１ 搬送ロール
１２ 表面調整液吹き付けノズル
２０ 膜厚均一化処理装置
２１ リンガーロール
３０ 気体吹き付け装置
３１ 気体吹き付けノズル
４０ リン酸亜鉛処理装置
４１ 搬送ロール
４２ リン酸亜鉛系処理液吹き付けノズル
４３ 搬送ロール
５０ 電気めっき設備
Ｓ 鋼板
ＳＭ 亜鉛系めっき鋼板
REFERENCE SIGNS LIST 1 Chemical conversion treatment equipment 10 Surface conditioning treatment device 11 Transport roll 12 Surface conditioning liquid spray nozzle 20 Film thickness uniformization treatment device 21 Wringer roll 30 Gas spray device 31 Gas spray nozzle 40 Zinc phosphate treatment device 41 Transport roll 42 Zinc phosphate treatment liquid spray nozzle 43 Transport roll 50 Electroplating equipment S Steel sheet S M Zinc-plated steel sheet
Claims (2)
前記亜鉛系めっき鋼板の表面上に表面調整液を塗布し表面調整処理を行う表面調整処理工程と、
該表面調整処理工程の後、表面調整処理が施された前記亜鉛系めっき鋼板の表面にリンガーロールを押し付けて表面調整液の膜厚の均一化処理を行う膜厚均一化処理工程と、
該膜厚均一化処理工程の後、リン酸亜鉛系処理液を表面調整液の膜厚均一化処理が施された前記亜鉛系めっき鋼板の表面に塗布することによりリン酸亜鉛被膜を形成するリン酸亜鉛処理工程とを含み、
前記膜厚均一化処理工程においては、前記リンガーロールの前記亜鉛系めっき鋼板に対する押し付け圧力を、当該押し付け圧力をＰ［ｋｇｆ／ｃｍ２］、亜鉛系めっき鋼板の板厚をｔ［ｍｍ］としたとき、下記式の範囲に制御することを特徴とするリン酸亜鉛処理鋼板の製造方法。
０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋２．６０≦Ｐ≦０．２７ｔ３－０．９０ｔ２＋１．６０ｔ＋３．６０ A method for manufacturing a zinc phosphate-treated steel sheet using a zinc-based plated steel sheet having a thickness of 0.3 mm or more and 3.3 mm or less as a base,
a surface conditioning treatment step of applying a surface conditioning liquid to the surface of the zinc-based plated steel sheet and performing a surface conditioning treatment;
a film thickness uniforming step in which, after the surface conditioning step, a wringer roll is pressed against the surface of the zinc-based plated steel sheet that has been subjected to the surface conditioning step to uniformize the film thickness of the surface conditioning solution;
a zinc phosphate treatment step of forming a zinc phosphate coating by applying a zinc phosphate treatment solution to the surface of the zinc-based plated steel sheet that has been subjected to the film thickness uniforming treatment with the surface conditioning solution after the film thickness uniforming treatment step,
The method for producing a zinc phosphate-treated steel sheet is characterized in that in the film thickness uniforming treatment step, the pressing pressure of the wringer roll against the zinc-based plated steel sheet is controlled within the range of the following formula, where P [kgf/ cm2 ] is the pressing pressure and t [mm] is the thickness of the zinc-based plated steel sheet.
0.27t 3 -0.90t 2 +1.60t+2.60≦P≦0.27t 3 -0.90t 2 +1.60t+3.60
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001340792A (en) | 2000-06-01 | 2001-12-11 | Nkk Corp | Roll coating device and coating method |
| JP2003082485A (en) | 2001-09-11 | 2003-03-19 | Nippon Steel Corp | Apparatus and method for preventing sheet contamination in batch type steel sheet processing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001340792A (en) | 2000-06-01 | 2001-12-11 | Nkk Corp | Roll coating device and coating method |
| JP2003082485A (en) | 2001-09-11 | 2003-03-19 | Nippon Steel Corp | Apparatus and method for preventing sheet contamination in batch type steel sheet processing equipment |
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