JP4189296B2 - Method for producing tin-plated steel sheet for containers with excellent gloss - Google Patents
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Description
本発明は、最適な目付量をもって錫めっき処理された光沢性に優れた容器用錫めっき鋼板の製造方法に関する。 The present invention relates to a method for producing a tin-plated steel sheet for containers that is tin-plated with an optimum basis weight and has excellent gloss.
錫めっきを施した鋼板では、錫めっきの目付量を多くすることによって光沢度は高くなるが、コスト低減等の要請から、めっきの目付量を少なくし、かつ光沢度を確保したいというニーズがあり、それを達成するために様々な技術が提案されている。例えば、特許文献１では、めっき処理を施した鋼板を、フラックス剤を所定量含有したドラグアウト液中に浸漬することにより錫面の凹凸を抑制して、鋼板片面当たりのめっき量を２．０ｇ／ｍ２未満とすることができる方法が開示されている。
しかしながら、上記の従来技術は、めっきの目付量を少なくできるものではあるが、要求された光沢度に対して最適なめっき量を算出することができるものではないため、めっきの目付量が過不足することによって、要求された光沢度を達成できないもしくはめっきを過剰に目付けしてしまい、多量のめっきを無駄に使用してしまう可能性があるという問題があった。 However, although the above-mentioned conventional technology can reduce the plating weight per unit area, it cannot calculate the optimum plating amount for the required glossiness, so the plating per unit area is excessive or insufficient. As a result, there is a problem that the required glossiness cannot be achieved, or the plating is excessively weighted and a large amount of plating may be used wastefully.
本発明は、上記課題を解決するためになされたものであり、最適なめっきの目付量をもってめっき処理することにより、要求された光沢度を達成した光沢性に優れた容器用錫めっき鋼板の製造方法を提供することを目的とする。 The present invention has been made in order to solve the above-mentioned problems, and is manufactured with a tin-plated steel sheet for containers excellent in glossiness that achieves a required glossiness by performing plating treatment with an optimum plating weight per unit area. an object of the present invention to provide a method.
まず、本発明の解明経緯について説明する。図１に示すように、所定の原板粗度を持った鋼板１に対しめっき処理を行う際、めっきＭの目付量を多くするのに従いめっき表面の凹凸が解消されていき、それによって粗度が低下し光沢度が向上するが、ある所定の目付量を超えると、表面の凹凸が解消され、目付量を増加させても光沢度が比例的に向上しなくなる。このことから、発明者らは、めっき目付量による粗度の変化を定式化して特定の光沢度を求めることにより、最適なめっき目付量をもって鋼板にめっき処理を行うことで要求された光沢度を達成することができるとの知見を得た。 First, the elucidation process of the present invention will be described. As shown in FIG. 1, when plating is performed on a steel sheet 1 having a predetermined original plate roughness, the unevenness of the plating surface is eliminated as the basis weight of the plating M is increased, thereby reducing the roughness. However, if a certain basis weight is exceeded, unevenness on the surface is eliminated, and even if the basis weight is increased, the gloss does not increase proportionally. From this, the inventors formulated the change in roughness due to the coating weight to obtain a specific glossiness, thereby obtaining the required glossiness by performing the plating process on the steel sheet with the optimum coating weight. The knowledge that it can be achieved was obtained.
即ち、本発明に係る光沢性に優れた容器用錫めっき鋼板の製造方法は、容器用鋼板に対して錫めっきを行い、要求された光沢度Ｇｓを持つ光沢性に優れた容器用錫めっき鋼板を製造する方法であって、原板粗度Ｒａと要求された光沢度Ｇｓとを下式（I）に代入して目付量Ｑの許容範囲を算出し、目付量Ｑが算出された許容範囲となるように錫めっきを行うことを特徴とするものである。
７．２８×〔Ｒａ−０．５＋（Ｇｓ／１９４０）〕≦Ｑ≦７．２８×〔Ｒａ＋０．２＋（Ｇｓ／１９４０）〕 （I）
ただし、Ｒａの単位はμｍ、光沢度Ｇｓの単位は無次元、Ｑの単位はｇ／ｍ ２ である。
That is, the manufacturing method of the superior container tinned steel sheet gloss according to the present invention performs a tin plating to the container for steel sheet excellent container for tin-plated steel sheet glossiness with the required gloss Gs Is calculated by substituting the raw sheet roughness Ra and the required glossiness Gs into the following formula (I) to calculate the allowable range of the basis weight Q, and the allowable range where the basis weight Q is calculated: Thus, tin plating is performed.
7.28 × [Ra−0.5 + (Gs / 1940)] ≦ Q ≦ 7.28 × [Ra + 0.2 + (Gs / 1940)] (I)
However, the unit of Ra is μm, the unit of glossiness Gs is dimensionless, and the unit of Q is g / m 2 .
本発明によれば、容器用鋼板の原板粗度Ｒａと、鋼板への錫めっき目付量Ｑと、その目付量Ｑをもって鋼板に錫めっき処理したときの光沢度との関係を導出することにより、所定の原板粗度を持つ容器用鋼板に対して、要求された光沢度Ｇｓを達成するためにはどれくらいの目付量Ｑで錫めっき処理を行うのが最適であるかを算出することができる。従って、要求光沢度を確実に達成できると共に、要求された光沢度に応じて無駄に多量のめっき目付けをしてしまうことなく、めっきの目付量を最小限に抑えてめっき処理のコストを低減することができる。 According to the present invention, by deriving the relationship between the raw sheet roughness Ra of the steel plate for containers, the tin plating basis weight Q on the steel plate, and the glossiness when the steel plate is tin-plated with the basis weight Q, It is possible to calculate the optimum amount Q of tin plating for achieving the required glossiness Gs for a steel plate for containers having a predetermined original plate roughness. Therefore, the required glossiness can be surely achieved, and the plating weight can be minimized and the plating process cost can be reduced without wastefully applying a large amount of plating according to the required glossiness. be able to.
以下、本発明に係る光沢性に優れた容器用錫めっき鋼板及びその製造方法について具体的に説明する。尚、本実施の形態では、クロメート処理された容器用錫めっき鋼板及びその製造方法について説明する。錫めっき処理をした鋼板の光沢度を決定する要因として、錫めっき表面の凹凸状態が挙げられるが、図１に示すように、錫めっきＭの目付量の増加に伴ってめっき表面の凹凸が解消されて、光沢度が増加することになる。クロメート処理が施されている場合も、錫めっき表面のクロメート皮膜は錫めっき層に比べて非常に薄いため、実質的に錫めっき表面の凹凸状態によって光沢度が決まることになる。ここで、所定の目付量（Ｑ）をもって鋼板に錫めっき処理を行う場合、錫めっき処理後の仮想的な錫面（めっき面）粗度（以下、「計算粗度」という。）（ＲＡ）は、鋼板の原板粗度（Ｒａ）と錫めっきの厚さとから推定可能である。 Hereinafter, the tin-plated steel plate for containers excellent in luster according to the present invention and a method for producing the same will be described in detail. In addition, this Embodiment demonstrates the tin-plated steel plate for containers by which the chromate process was carried out, and its manufacturing method. As a factor for determining the glossiness of the tin-plated steel sheet, the uneven state of the tin-plated surface can be mentioned, but as shown in FIG. 1, the unevenness of the plated surface is eliminated as the amount of tin plating M increases. As a result, the glossiness increases. Even in the case where the chromate treatment is performed, the chromate film on the tin plating surface is very thin as compared with the tin plating layer, and therefore the glossiness is substantially determined by the uneven state of the tin plating surface. Here, when tin plating is performed on a steel sheet with a predetermined basis weight (Q), virtual tin surface (plated surface) roughness after tin plating (hereinafter referred to as “calculated roughness”) (RA). Can be estimated from the original plate roughness (Ra) of the steel plate and the thickness of the tin plating.
具体的には、計算粗度（ＲＡ）は、めっき目付量をＱとし、錫の密度の７．２８（ｇ／ｃｍ３）を用いて、原板粗度Ｒａからめっきの厚みを減じたものとして数式１のように表される。この計算粗度（ＲＡ）は、原板粗度（Ｒａ）が小さいほど、また錫めっきの目付量Ｑが多いほど小さくなり、めっき表面の凹凸が解消された後は負の値となる。従って、めっき表面の凹凸が解消された後は、めっき目付量の増加に伴って計算粗度は減少していくが、実質的に目付量の増加が光沢度に影響することはない。尚、数式１中のＡは錫の結晶形態を表すパラメータであり、０．５≦Ａ≦０．７である。 Specifically, the calculated roughness (RA) is obtained by subtracting the plating thickness from the original plate roughness Ra using a plating basis weight Q and a tin density of 7.28 (g / cm 3 ). It is expressed as Equation 1. The calculated roughness (RA) is smaller as the original plate roughness (Ra) is smaller and the basis weight Q of the tin plating is larger, and becomes a negative value after the unevenness of the plating surface is eliminated. Therefore, after the unevenness of the plating surface is eliminated, the calculated roughness decreases as the plating basis weight increases, but the increase in the basis weight does not substantially affect the glossiness. A in Formula 1 is a parameter representing the crystal form of tin, and 0.5 ≦ A ≦ 0.7.
次に、実際に、異なる原板粗度を持つ各鋼板に対し、所定の目付量をもって錫めっき処理を行ったときの計算粗度と光沢度との関係について説明する。表１に、異なる原板粗度を持つ各鋼板（１）〜（３）に対し、それぞれ所定量のめっき目付量をもって錫めっき処理した場合の計算粗度及び光沢度の実績を示し、表２に表１から得られた計算粗度と光沢度との関係を示す。尚、光沢度は、ＪＩＳＺ８７４１に規定される方法により、市販の光沢度計を用いて入射角及び反射角を２０°として測定した。 Next, the relationship between the calculated roughness and the gloss when the tin plating process is performed with a predetermined basis weight on each steel plate having different original plate roughness will be described. Table 1 shows the results of calculation roughness and gloss when each steel plate (1) to (3) having different original plate roughness is tin-plated with a predetermined amount of plating basis weight. The relationship between the calculated roughness obtained from Table 1 and the glossiness is shown. The glossiness was measured by a method specified in JISZ8741 using a commercially available glossiness meter with an incident angle and a reflection angle of 20 °.
鋼板（１）は、原板粗度が０．３５μｍであり、この鋼板に対して所定の目付量１．３〜１１．２ｇ／ｍ２をもってそれぞれめっき処理をしたときの計算粗度が数式１から算出される。以下同様に、数式１を用いて鋼板（２）及び（３）についてもそれぞれ計算粗度が算出され、表に示すように、各目付量及び計算粗度に対して光沢度が得られる。表１、２から明らかなように、計算粗度が低下するのに伴ってある範囲まで光沢度は増加し続けるが、負の領域で計算粗度がある程度まで減少すると、そこから光沢度はほとんど変化しなくなることが分かる。 The steel sheet (1) has an original sheet roughness of 0.35 μm, and the calculated roughness when the steel sheet (1) is plated with a predetermined basis weight of 1.3 to 11.2 g / m 2 is calculated from Equation 1. Calculated. Similarly, the calculated roughness is calculated for each of the steel plates (2) and (3) using Equation 1, and the glossiness is obtained for each basis weight and calculated roughness as shown in the table. As is clear from Tables 1 and 2, the glossiness continues to increase to a certain range as the calculated roughness decreases, but when the calculated roughness decreases to some extent in the negative region, the glossiness is almost from there. It turns out that it does not change.
また、表２に示すように、計算粗度の低下に伴って光沢度は比例的に増加しており、表２における計算粗度に対する光沢度の値を図示外のグラフ上にプロットすることによって、具体的には計算粗度の１μｍ減少に対して光沢度が略１９４０だけ増加する傾向があることが確認できる。これにより、計算粗度の減少に対し光沢度が比例的に増加する領域では、計算粗度（ＲＡ）と光沢度（Ｇｓ）との関係を数式２として与えることができる。尚、数式２中のＢは、錫の表面性状を表すパラメータであり、９００≦Ｂ≦１９００である。 Further, as shown in Table 2, the gloss increases proportionally as the calculated roughness decreases, and by plotting the gloss value with respect to the calculated roughness in Table 2 on a graph (not shown). Specifically, it can be confirmed that the glossiness tends to increase by about 1940 with respect to a decrease in the calculated roughness of 1 μm. As a result, in a region where the glossiness increases in proportion to the decrease in the calculated roughness, the relationship between the calculated roughness (RA) and the glossiness (Gs) can be given as Equation 2. Note that B in Formula 2 is a parameter representing the surface properties of tin, and 900 ≦ B ≦ 1900.
この数式２から、光沢度（Ｇｓ）と計算粗度（ＲＡ）との関係は数式３のように表され、さらに、この数式３と上記数式１とから、錫めっきの目付量（Ｑ）を、光沢度（Ｇｓ）と原板粗度（Ｒａ）とを用いて数式４のように表すことができる。 From Equation 2, the relationship between the glossiness (Gs) and the calculated roughness (RA) is expressed as Equation 3. Further, from this Equation 3 and Equation 1, the basis weight (Q) of the tin plating can be calculated. Further, it can be expressed as Equation 4 using the glossiness (Gs) and the original plate roughness (Ra).
ここで、上述のＡ及びＢの範囲から、数式４の右辺における−Ｂ／１９４０＋Ａの範囲は（−０．５≦−Ｂ／１９４０＋Ａ≦０．２）となり、数式４の右辺が、７．２８×（Ｒａ−０．５＋Ｇｓ／１９４０）であるとき、錫めっきの目付量（Ｑ）が最も少なくなり、７．２８×（Ｒａ＋０．２＋Ｇｓ／１９４０）であるとき、錫めっきの目付量（Ｑ）が最も多くなる。即ち、前者がめっき表面状態が最も良好な場合であり、後者がめっき表面状態が最も悪い場合であって、錫めっきの無駄を省くため、後者の場合よりも多くめっきを目付けする必要はなく、また、要求光沢度を達成するため、少なくとも前者の場合より目付量を多くしてめっきしなければならないことが分かる。従って、数式５を満足するように錫めっきの目付量（Ｑ）を調整すれば、所望の光沢度（Ｇｓ）を達成することができる。 Here, from the range of A and B described above, the range of −B / 1940 + A on the right side of Formula 4 is (−0.5 ≦ −B / 1940 + A ≦ 0.2), and the right side of Formula 4 is 7.28. When x (Ra-0.5 + Gs / 1940), the tin plating basis weight (Q) is the smallest, and when 7.28 x (Ra + 0.2 + Gs / 1940), the tin plating basis weight (Q) Will be the most. That is, the former is the case where the plating surface state is the best, and the latter is the case where the plating surface state is the worst, and in order to eliminate the waste of the tin plating, it is not necessary to apply plating more than the latter case, In addition, it can be seen that in order to achieve the required glossiness, plating must be performed with a larger basis weight than at least the former case. Therefore, the desired glossiness (Gs) can be achieved by adjusting the tin plating basis weight (Q) so as to satisfy Formula 5.
以上説明したように、本発明の光沢性に優れた容器用錫めっき鋼板の製造方法では、所定の原板粗度を持った容器用鋼板への錫めっき処理に際し、要求された光沢度を満足するためにどのくらいのめっき目付量が必要であるかを算出して最適なめっき目付量をもってめっき処理することができる。従って、要求通りの光沢度を達成した質の高いめっき処理を無駄なく行うことができ、めっき処理のコストを低減することができる。 As described above, in the manufacturing method of the superior container tin-plated steel sheet gloss of the present invention, when the tin plating treatment to the container for steel having a predetermined original sheet roughness satisfies the requested gloss Therefore, it is possible to calculate how much plating basis weight is necessary and perform the plating process with an optimum plating basis weight. Therefore, a high-quality plating process that achieves the required glossiness can be performed without waste, and the cost of the plating process can be reduced.
尚、本発明は上記実施の形態に限定されるものではなく、各種の変形が可能である。例えば、本実施の形態では、クロメート処理した錫めっきを施した鋼板について説明したが、何層も重ねるめっきの場合についても、同様に要求された光沢度から最適なめっき目付量を算出してめっき処理することができる。この場合の計算粗度は、鋼板の原板粗度から各層の厚さ（目付量／密度）を差し引いたものとして算出することができる。また、最表層に位置するめっき材料が錫以外のものである場合は、その材料でめっき処理したときの光沢度と計算粗度との関係式を導くことにより、錫めっきの場合と同様に最適なめっき目付量を算出することができる。 In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the present embodiment, the description has been given of the steel plate subjected to the tin plating subjected to the chromate treatment, but in the case of plating in which many layers are stacked, the optimum plating basis weight is similarly calculated from the required glossiness and plated. Can be processed. The calculated roughness in this case can be calculated by subtracting the thickness (weight per unit area / density) of each layer from the original sheet roughness of the steel sheet. Also, when the plating material located on the outermost layer is something other than tin, it is optimal as in the case of tin plating by deriving the relational expression between glossiness and calculated roughness when plating with that material It is possible to calculate an appropriate plating basis weight.
Claims (1)
７．２８×〔Ｒａ−０．５＋（Ｇｓ／１９４０）〕≦Ｑ≦７．２８×〔Ｒａ＋０．２＋（Ｇｓ／１９４０）〕 （I）
ただし、Ｒａの単位はμｍ、光沢度Ｇｓの単位は無次元、Ｑの単位はｇ／ｍ ２ である。 A method for producing a tin-plated steel sheet for containers having a required glossiness Gs and performing tin plating on the steel sheet for containers, wherein the raw sheet roughness Ra and the required glossiness Gs are obtained. Substituting into the following formula (I) to calculate the permissible range of the basis weight Q, and performing tin plating so that the per unit area Q falls within the calculated permissible range. A method of manufacturing a steel sheet.
7.28 × [Ra−0.5 + (Gs / 1940)] ≦ Q ≦ 7.28 × [Ra + 0.2 + (Gs / 1940)] (I)
However, the unit of Ra is μm, the unit of glossiness Gs is dimensionless, and the unit of Q is g / m 2 .
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