JPH0765152B2 - Method for forming oxide film on hot-dip galvanized steel sheet - Google Patents
Method for forming oxide film on hot-dip galvanized steel sheetInfo
- Publication number
- JPH0765152B2 JPH0765152B2 JP1281910A JP28191089A JPH0765152B2 JP H0765152 B2 JPH0765152 B2 JP H0765152B2 JP 1281910 A JP1281910 A JP 1281910A JP 28191089 A JP28191089 A JP 28191089A JP H0765152 B2 JPH0765152 B2 JP H0765152B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- atomized water
- oxide film
- galvanized steel
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Coating With Molten Metal (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は溶融亜鉛めっき鋼板および合金化溶融亜鉛めっ
き鋼板の酸化膜生成方法に関するものである。TECHNICAL FIELD The present invention relates to a hot dip galvanized steel sheet and a method for forming an oxide film on an alloyed hot dip galvanized steel sheet.
（従来技術） 溶融亜鉛めっき鋼板および合金化溶融亜鉛めっき鋼板の
スポット溶接性を向上するため、その表面にZnO含有の
酸化膜を生成することが知られている（特開昭59−1044
63）。(Prior Art) It is known to form a ZnO-containing oxide film on the surface of a hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet in order to improve spot weldability (JP-A-59-1044).
63).
（発明が解決しようとする課題） しかして、このようなZnO系酸化膜を工業的規模で、確
実に生成することが、最も重要なことであり、強く要請
されいるところである。本発明は、このような要求を有
利に満足する優れたZnO系酸化膜の生成方法に提供する
ものである。(Problems to be Solved by the Invention) The reliable production of such a ZnO-based oxide film on an industrial scale is of utmost importance and is strongly demanded. The present invention provides an excellent method for producing a ZnO-based oxide film that advantageously satisfies these requirements.
（課題を解決するための手段） 本発明の特徴とするところは、（１）溶融めっき直後あ
るいは溶融めっきを合金化処理した直後の高温状態の水
粒の大きさが平均粒径５〜1000μｍである霧化水雰囲気
内で、該霧化水を高温にあるめっき鋼板表面付近で蒸気
化する熱処理をすることを特徴とする溶融系亜鉛めっき
鋼板の酸化膜生成方法（２）霧化水雰囲気での熱処理に
おいて、霧化水突出ノズルと処理板間距離を100〜2500m
mとし、霧化水の突出速度を10〜100m/secとすることを
特徴とした、前記（１）記載の溶融系亜鉛めっき鋼板の
酸化膜生成方法に関するものである。(Means for Solving the Problems) The feature of the present invention is that (1) the size of water particles in a high temperature state immediately after hot dip coating or immediately after hot dip galvanizing is an average particle diameter of 5 to 1000 μm. A method for producing an oxide film of a galvanized steel sheet, which comprises subjecting the atomized water to vaporization near the surface of the galvanized steel sheet at a high temperature in an atomized water atmosphere (2) in an atomized water atmosphere In the heat treatment of, the distance between the atomizing water ejection nozzle and the treatment plate is 100-2500m.
The present invention relates to the method for producing an oxide film of a hot-dip galvanized steel sheet according to (1) above, characterized in that the projection speed of atomized water is 10 to 100 m / sec.
本発明における溶融亜鉛めっき鋼板とは、Zn主成分とし
て、Fe,Al,Ni,Mg,Li,Mnなどの成分を単独ないしは複合
して含有させためっき浴に浸漬させた、めっき付着量20
〜200（g/m2）のめっき鋼板である。また、合金化溶融
亜鉛めっき鋼板とは、上記溶融亜鉛めっき鋼板をめっき
後、加熱し、熱拡散により、鋼板の鉄がめっき層中へ拡
散し、めっき層中の鉄量が７〜15％、めっき付着量20〜
100（g/m2）のめっき鋼板である。The hot-dip galvanized steel sheet in the present invention, as the Zn main component, Fe, Al, Ni, Mg, Li, was immersed in a plating bath containing a component such as Mn alone or in combination, the coating weight 20
It is a plated steel sheet of ~ 200 (g / m 2 ). Further, the alloyed hot-dip galvanized steel sheet, after the hot-dip galvanized steel sheet is plated, heated, by heat diffusion, iron of the steel sheet diffuses into the plating layer, the amount of iron in the plating layer is 7 to 15%, Plating coverage 20〜
It is a 100 (g / m 2 ) plated steel sheet.
しかして、このようなめっき鋼板においては、めっき後
あるいは合金化処理後、板温度450℃以上において、数
秒経過する。一般に、この過程でZnO系酸化膜が僅かに
形成されるがスポット溶接性を改善する必要な量は得ら
れない。しかし、この高温域において、即ち溶融めっき
直後、あるいは合金化処理直後の雰囲気を霧化水雰囲気
にすることにより、スポット溶接性改善に必要な量のZn
O系酸化膜が形成されることを見出した。However, in such a plated steel sheet, after plating or alloying treatment, several seconds elapse at a plate temperature of 450 ° C. or higher. In general, a slight amount of ZnO-based oxide film is formed in this process, but the amount necessary to improve spot weldability cannot be obtained. However, in this high temperature range, that is, immediately after the hot dip plating or immediately after the alloying treatment, the atomized water atmosphere is used to adjust the amount of Zn required for improving spot weldability
It was found that an O-based oxide film was formed.
霧化水としては、水を霧化状にしたもの、または気水混
合で霧化状にしたものを用いることができる。このよう
な霧化水は、高温にある板表面付近で蒸気化し、板表面
の霧点を高めることによりZnO系酸化膜の形成を促進す
る。このZnO系酸化膜を形成する霧化水の条件として、
霧化水の水粒の大きさ、霧化水を供給するノズルと処理
板の距離、ノズルから突出する霧化水の速度、霧化水の
温度および水量密度が重要である。As the atomized water, it is possible to use atomized water or atomized water-air mixture. Such atomized water is vaporized near the surface of the plate at high temperature, and promotes the formation of the ZnO-based oxide film by increasing the fog point on the surface of the plate. As conditions for atomized water to form this ZnO-based oxide film,
The size of the atomized water particles, the distance between the nozzle supplying the atomized water and the treatment plate, the speed of the atomized water protruding from the nozzle, the temperature of the atomized water, and the water amount density are important.
霧化水の水粒の大きさとしては、平均粒径で５〜1000μ
ｍが最適である。処理板表面の露点を高くかつ安定して
確保するうえで、水粒の大きさは小さすぎても、大きす
ぎてもこのましくない。同様の理由により、霧化水を供
給するノズルと処理板の距離およびノズルから突出する
霧化水の速度、霧化水の温度および水量密度も、最適な
条件が存在する。すなわち、霧化水を供給するノズルと
処理板の距離は、100〜2500mmの範囲が、ノズルから突
出する霧化水の速度は10〜100m/secの範囲が、また霧化
水の温度として５〜100℃の範囲が、さらに、霧化水の
水量密度は処理板の単位表面面積あたり１〜100/m2/m
inが最適である。The size of the water droplets of atomized water is 5 to 1000μ in average particle diameter.
m is optimal. In order to secure a high and stable dew point on the surface of the treated plate, it is not preferable that the size of the water particles is too small or too large. For the same reason, optimum conditions exist for the distance between the nozzle supplying the atomized water and the treatment plate, the speed of the atomized water protruding from the nozzle, the temperature of the atomized water, and the water amount density. That is, the distance between the nozzle supplying the atomized water and the treatment plate is in the range of 100 to 2500 mm, the speed of the atomized water protruding from the nozzle is in the range of 10 to 100 m / sec, and the temperature of the atomized water is 5 In the range of up to 100 ℃, the water density of atomized water is 1 to 100 / m 2 / m per unit surface area of the treated plate.
in is the best.
しかして、このような霧化水雰囲気処理は、めっき直後
あるいは合金化処理直後に設けた霧化水雰囲気炉でなさ
れ、高温下にある板表面の露点を高く確保することによ
り、ZnO形成を促進するうえで有効である。このような
条件で、形成される酸化膜の生成量としては、30〜3000
（mg/m2）で、例えばスポット溶接電極が溶接時の発熱
による損耗を十分抑制することができる。However, such atomized water atmosphere treatment is performed in an atomized water atmosphere furnace provided immediately after plating or immediately after alloying treatment, and promotes ZnO formation by ensuring a high dew point on the plate surface under high temperature. It is effective in doing. Under such conditions, the amount of oxide film formed is 30 to 3000.
With (mg / m 2 ), for example, the spot welding electrode can sufficiently suppress wear due to heat generation during welding.
次ぎに、本発明の一例を第１図により説明する。図面に
おいて、鋼帯１を溶融亜鉛浴２へ導き、めっき後ノズル
３からガスを噴射し、所定の付着量に制御した後、合金
化炉４へ導き、加熱して、めっき金属を合金化処理し、
露化水雰囲気炉５で高露点雰囲気と接触せしめ、酸化膜
を生成する。霧化水は、タンクより供給管６を介して供
給された水とブロアー７を介して供給される空気によ
り、気水ノズル８を介して供給される。しかして、めっ
きラインによっては、露化水雰囲気炉５を設置するもの
である。Next, an example of the present invention will be described with reference to FIG. In the drawing, a steel strip 1 is introduced into a molten zinc bath 2, and after plating, a gas is injected from a nozzle 3 to control a predetermined adhesion amount, and then introduced into an alloying furnace 4, which is heated to alloy a plated metal. Then
The dew water atmosphere furnace 5 is brought into contact with a high dew point atmosphere to form an oxide film. The atomized water is supplied through the steam nozzle 8 by the water supplied from the tank through the supply pipe 6 and the air supplied through the blower 7. Depending on the plating line, the exposed water atmosphere furnace 5 is installed.
（発明の効果） かくすることにより、スポット溶接性を向上する酸化膜
を確実に、しかも工業的規模で、安定して生成すること
ができる等の優れた効果が得られる。 (Effects of the Invention) By doing so, excellent effects such as reliable and stable production of an oxide film that improves spot weldability on an industrial scale can be obtained.
の第１図は、本発明の一例を示す説明図である。 １……鋼帯 ２……溶融亜鉛浴 ３……ノズル ４……合金化炉 ５……霧化水雰囲気炉 ６……供給管 ７……ブロアー ８……気水ノズル FIG. 1 is an explanatory diagram showing an example of the present invention. 1 ... Steel strip 2 ... Molten zinc bath 3 ... Nozzle 4 ... Alloying furnace 5 ... Atomizing water atmosphere furnace 6 ... Supply pipe 7 ... Blower 8 ... Steam nozzle
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−230861（ＪＰ，Ａ) 特開 平２−190463（ＪＰ，Ａ) 特開 平２−19450（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-63-230861 (JP, A) JP-A-2-190463 (JP, A) JP-A-2-19450 (JP, A)
Claims (2)
化処理した直後の高温状態において水粒の大きさが平均
粒径５〜1000μｍである霧化水雰囲気内で、該霧化水を
高温にあるめっき鋼板表面付近で蒸気化する熱処理をす
ることを特徴とする溶融系亜鉛めっき鋼板の酸化膜生成
方法。1. The atomized water is at a high temperature in an atomized water atmosphere having an average particle size of 5 to 1000 μm immediately after hot dipping or immediately after hot dip alloying treatment. A method for forming an oxide film on a hot dip galvanized steel sheet, characterized by performing a heat treatment for vaporization near the surface of the galvanized steel sheet.
突出ノズルと処理板間距離を100〜2500mmとし、霧化水
の突出速度を10〜100m/secとすることを特徴とした、特
許請求の範囲第１項記載の溶融系亜鉛めっき鋼板の酸化
膜生成方法。2. A heat treatment in an atomized water atmosphere, wherein the distance between the atomized water ejection nozzle and the treatment plate is 100 to 2500 mm, and the atomized water ejection speed is 10 to 100 m / sec. A method for producing an oxide film of a hot-dip galvanized steel sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1281910A JPH0765152B2 (en) | 1989-10-31 | 1989-10-31 | Method for forming oxide film on hot-dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1281910A JPH0765152B2 (en) | 1989-10-31 | 1989-10-31 | Method for forming oxide film on hot-dip galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03146648A JPH03146648A (en) | 1991-06-21 |
| JPH0765152B2 true JPH0765152B2 (en) | 1995-07-12 |
Family
ID=17645660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1281910A Expired - Lifetime JPH0765152B2 (en) | 1989-10-31 | 1989-10-31 | Method for forming oxide film on hot-dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765152B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0772332B2 (en) * | 1987-03-20 | 1995-08-02 | 新日本製鐵株式会社 | Method for producing alloyed molten zinc plated steel sheet with excellent spot weldability |
| JPH02190463A (en) * | 1989-01-20 | 1990-07-26 | Kawasaki Steel Corp | Production of hot dipping galvanized steel sheet excellent in spot weldability |
-
1989
- 1989-10-31 JP JP1281910A patent/JPH0765152B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03146648A (en) | 1991-06-21 |
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