JP2005213580A - Production method of tin plated steel plate - Google Patents
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Abstract
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本発明は、錫鍍金鋼板の製造方法、より具体的には、表面の青みの色調が抑制されて外観に優れ、さらに耐食性と塗料密着性に優れる錫鍍金鋼板の製造方法に関するものである。 The present invention relates to a method for producing a tin-plated steel sheet, and more specifically, to a method for producing a tin-plated steel sheet that is excellent in appearance by suppressing the color tone of the bluish surface and further excellent in corrosion resistance and paint adhesion.
ぶりき材（錫鍍金鋼板）は、連続錫鍍金設備の前処理工程で鋼板表面が清浄化され、鍍金工程で電気錫鍍金され、リフロー工程で錫層の溶融処理が施される。錫層溶融後の鍍金鋼板表面は、自然発生した酸化物に覆われており、長期間の保管や塗料焼き付け時の酸化により、塗料密着性などの特性が劣化する。これを防ぐため、リフロー処理に引き続いて化成処理が施される。化成処理では、鍍金鋼板をクロム酸系の水溶液中で電解し、自然発生の錫酸化物を除去し、クロム水和酸化物層を形成させる。 The tinplate (tin-plated steel sheet) is cleaned in the pre-treatment process of the continuous tin-plating facility, electroplated in the plating process, and the tin layer is melted in the reflow process. The surface of the plated steel sheet after melting the tin layer is covered with naturally occurring oxides, and properties such as paint adhesion deteriorate due to long-term storage and oxidation during paint baking. In order to prevent this, a chemical conversion process is performed following the reflow process. In the chemical conversion treatment, the plated steel sheet is electrolyzed in a chromic acid aqueous solution to remove naturally occurring tin oxide, thereby forming a chromium hydrated oxide layer.
近年の客先要求度の向上に伴い、一般ぶりき材においても耐食性と塗料密着性を向上させるニーズが高まっている。 With the recent improvement in customer requirements, there is an increasing need for improving the corrosion resistance and paint adhesion of general tinting materials.
化成処理において、金属クロム層とクロム水和酸化物層とからなる皮膜を形成させることで、耐食性と塗料密着性を向上できることが知られている（例えば、特許文献１等参照）。 It is known that in a chemical conversion treatment, corrosion resistance and paint adhesion can be improved by forming a film composed of a metal chromium layer and a chromium hydrated oxide layer (see, for example, Patent Document 1).
クロム酸系の水溶液中での電解処理方法として、重クロム酸溶液を用いる方法と、無水クロム酸溶液を用いる方法とが知られている。本発明者らの検討結果によれば、重クロム酸溶液を用いた場合、所要の耐食性と塗料密着性を確保できないことが多く、無水クロム酸溶液を用いた場合、この問題がないことが明らかになった。 As an electrolytic treatment method in a chromic acid aqueous solution, a method using a dichromic acid solution and a method using a chromic anhydride solution are known. According to the examination results of the present inventors, it is clear that when a dichromic acid solution is used, the required corrosion resistance and paint adhesion cannot be ensured in many cases, and when a chromic anhydride solution is used, this problem does not occur. Became.
以下に先行文献情報について記載する。
多岐のサイズの製品が製造されるようになった結果、その中には、厚物サイズ等において、リフロー工程の加熱・冷却能力の点から、ライン速度が制約を受ける場合等がある。無水クロム酸溶液で電解処理を行った場合、低速域で操業、例えばライン速度が２００ｍｐｍ以下の速度域で操業した場合、錫鍍金鋼板の表面が青く変色し、これによって外観不良になるという問題点があることが明らかになった。 As a result of the production of products of various sizes, there are cases in which the line speed is restricted in terms of the heating / cooling capability of the reflow process, for example, in the size of thick materials. When electrolytic treatment is performed with a chromic anhydride solution, when the operation is performed at a low speed range, for example, when the line speed is 200 mpm or less, the surface of the tin-plated steel plate is discolored blue, which causes a poor appearance. It became clear that there is.
そこで、本発明は、前述の問題点を解消し、表面の青みの色調を抑制して、外観に優れ、また耐食性と塗料密着性に優れる錫鍍金鋼板の製造方法を提供することが課題である。 Therefore, the present invention has an object to provide a method for producing a tin-plated steel sheet that solves the above-mentioned problems, suppresses the color tone of the surface bluish, has excellent appearance, and has excellent corrosion resistance and paint adhesion. .
上記課題を解決する手段は、鋼板に、前処理工程、錫鍍金工程及びリフロー工程を施した後、５〜３５ｇ／ｌの炭酸ソーダ水溶液中で鋼板を陰極として０．５〜３．７ｃ／ｄｍ2で電解処理を行い、次いで、１０〜６０ｇ／ｌの無水クロム酸を含み、温度が３０〜４０℃の水溶液中で鋼板を陰極として電解処理を行い、鍍金表面に下層としてクロム量が５〜２０ｍｇ／ｍ2の金属クロム層と、その上層として金属クロム換算で１０〜３０ｍｇ／ｍ2のクロム水和酸化物層を形成することを特徴とする、錫鍍金鋼板の製造方法である。 The means for solving the above-mentioned problems is that the steel sheet is subjected to a pretreatment process, a tin plating process and a reflow process, and then the steel sheet is used as a cathode in a sodium carbonate aqueous solution of 5 to 35 g / l to 0.5 to 3.7 c / dm. 2 followed by electrolytic treatment with 10 to 60 g / l of chromic anhydride and a steel plate as a cathode in an aqueous solution at a temperature of 30 to 40 ° C. a metal chromium layer of 20 mg / m 2, and forming a hydrated chromium oxide layer of 10 to 30 mg / m 2 reckoned as metal chromium as an upper layer, a method for producing a tin-plated steel sheet.
本発明によれば、低速操業であっても、ライン速度に影響されることなく、表面の青みの色調を抑制して、外観に優れ、また耐食性と塗料密着性に優れる錫鍍金鋼板を製造できる。 According to the present invention, it is possible to manufacture a tin-plated steel sheet that is excellent in appearance, corrosion resistance, and paint adhesion, by suppressing the color tone of the bluish surface without being affected by the line speed, even at low speed operation. .
本発明者らは、表面が青色化する原因を調査すべく、化成処理後の皮膜を観察した。その結果、表面が青くなる皮膜はそうでない皮膜と比較して、化成処理皮膜の形態が不均一で凹凸が大きくなっていることがわかった。そこで、極力皮膜を均一に析出させる手法について種々検討した。 The present inventors observed the film after chemical conversion treatment in order to investigate the cause of the blue surface. As a result, it was found that the film having a blue surface was non-uniform in shape and unevenness as compared with the other film. Therefore, various methods for uniformly depositing the film as much as possible were examined.
先ず、化成皮膜の不均一な析出は無水クロム酸溶液で電解処理する前の鍍金表面の状態が不安定であるとの考えから、電解処理前にアルカリ処理を行い鍍金表面状態の不安定さを緩和することを検討した。その結果、化成皮膜の不均一な析出を改善するには、アルカリ電解処理条件を緩和された条件で行うこと、具体的には炭酸ソーダ溶液を使用し、その濃度、電気量を低下することが有効であることを見出した。 First, the non-uniform deposition of the chemical conversion film is considered to be because the state of the plating surface before the electrolytic treatment with the chromic anhydride solution is unstable. Considered mitigation. As a result, in order to improve the non-uniform deposition of the chemical conversion film, the alkaline electrolysis treatment conditions should be relaxed. Specifically, a sodium carbonate solution may be used to reduce the concentration and quantity of electricity. I found it effective.
また、化成処理反応に係わる因子の不均一な化成皮膜形成への影響有無を調査した。その結果、化成皮膜の不均一な析出を改善するには、無水クロム酸濃度の増加、溶液温度の低下が有効であることが明らかになった。 Moreover, the presence or absence of the influence on the formation of a non-uniform chemical film was investigated. As a result, it was found that increasing the chromic anhydride concentration and lowering the solution temperature are effective in improving the non-uniform deposition of the chemical conversion film.
そして、無水クロム酸溶液による電解処理前に、炭酸ソーダ溶液を用いて特定条件で電解処理を行うこと、次いで、無水クロム酸溶液を用いて特定条件で電解処理することで、低速域で操業した場合に起こる錫鍍金鋼板の表面が青く変色する問題点を解消し、また耐食性と塗料密着性に優れた錫鍍金鋼板が得られることを見出した。本発明はこの知見に基づきなされた。 And before the electrolytic treatment with the chromic anhydride solution, the electrolytic treatment was performed under specific conditions using the sodium carbonate solution, and then the electrolytic treatment was performed under the specific conditions using the anhydrous chromic acid solution. The present inventors have found that a tin-plated steel sheet having excellent corrosion resistance and paint adhesion can be obtained by solving the problem that the surface of the tin-plated steel sheet turns blue in some cases. The present invention has been made based on this finding.
本発明は、鋼板に、前処理工程、錫鍍金工程及びリフロー工程を施した後、５〜３５ｇ／ｌの炭酸ソーダ水溶液中で鋼板を陰極として０．５〜３．７ｃ／ｄｍ2で電解処理を行い、次いで、１０〜６０ｇ／ｌの無水クロム酸を含み、温度が３０〜４０℃の水溶液中で鋼板を陰極として電解処理を行い、鍍金表面に下層としてクロム量が５〜２０ｍｇ／ｍ2の金属クロム層と、その上層として金属クロム換算で１０〜３０ｍｇ／ｍ2のクロム水和酸化物層を形成することが特徴である。 In the present invention, a steel plate is subjected to a pretreatment step, a tin plating step and a reflow step, and then subjected to electrolytic treatment at 0.5 to 3.7 c / dm 2 using a steel plate as a cathode in an aqueous sodium carbonate solution of 5 to 35 g / l. Next, electrolytic treatment is performed using a steel plate as a cathode in an aqueous solution containing 10 to 60 g / l chromic anhydride and having a temperature of 30 to 40 ° C., and the chromium content is 5 to 20 mg / m 2 as a lower layer on the plating surface. And a chromium hydrated oxide layer of 10 to 30 mg / m 2 in terms of metal chrome as an upper layer.
以下、本発明について詳しく説明する。 The present invention will be described in detail below.
本発明の錫鍍金鋼板を製造する際に、鋼板（冷延鋼板）をアルカリ水溶液中で電解脱脂後、酸洗を行う通常の前処理工程後、電気錫鍍金を施し、リフロー工程により鍍金された錫を溶融光沢化する。次いで、炭酸ソーダ溶液中で電解処理を行い、さらにクロム酸溶液中で電解処理を行う。炭酸ソーダ溶液中での電解処理方法、及び無水クロム酸溶液中での電解処理方法について以下に記載する。 When producing the tin-plated steel sheet of the present invention, the steel sheet (cold-rolled steel sheet) was electrolytically degreased in an alkaline aqueous solution and then subjected to a normal pretreatment step in which pickling was performed. Melt and tin tin. Next, electrolytic treatment is performed in a sodium carbonate solution, and further electrolytic treatment is performed in a chromic acid solution. An electrolytic treatment method in a sodium carbonate solution and an electrolytic treatment method in a chromic anhydride solution are described below.
（炭酸ソーダ水溶液中での電解処理）
炭酸ソーダ水溶液中で鍍金鋼板を陰極として以下のようにして電解処理を行う。
(Electrolytic treatment in aqueous sodium carbonate solution)
Electrolytic treatment is performed in a sodium carbonate aqueous solution as follows using a plated steel plate as a cathode.
炭酸ソーダの濃度は５〜３５ｇ／ｌとする。濃度が５ｇ／ｌ未満又は３５ｇ／ｌ超になると、鍍金表面状態の不安定さを緩和する効果が不十分になり、化成処理皮膜の青みの色調を抑制する効果が不十分になり、外観が劣化する。 The concentration of sodium carbonate is 5 to 35 g / l. When the concentration is less than 5 g / l or more than 35 g / l, the effect of reducing the instability of the plating surface state becomes insufficient, the effect of suppressing the blue color tone of the chemical conversion coating film becomes insufficient, and the appearance is improved. to degrade.
電解電気量は０．５〜３．７ｃ／ｄｍ2とする。電気量が０．５ｃ／ｄｍ2未満又は３．７ｃ／ｄｍ2超になると、鍍金表面状態の不安定さを緩和する効果が不十分になり、化成処理皮膜の青みの色調を抑制する効果が不十分になり、外観が劣化する。 Electrolytic electrical quantity is a 0.5~3.7c / dm 2. When the amount of electricity is less than 0.5 c / dm 2 or more than 3.7 c / dm 2 , the effect of reducing the instability of the plating surface state becomes insufficient, and the effect of suppressing the blue color tone of the chemical conversion coating film is insufficient. It becomes insufficient and the appearance deteriorates.
鍍金鋼板を陰極として前記条件で電解処理することで、鍍金表面状態の不安定さが緩和され、後記する無水クロム酸溶液で電解処理したときに化成皮膜の不均一な析出が緩和される。 By subjecting the plated steel plate to an electrolytic treatment under the above conditions, the instability of the plated surface state is alleviated, and uneven deposition of the chemical conversion film is alleviated when electrolytic treatment is performed with a chromic anhydride solution described later.
鍍金表面状態の不安定さを緩和する観点から、前記以外の条件は、ｐＨは７．１〜９．５の範囲が好ましく、溶液温度は４５〜５５℃の範囲が好ましい。 From the viewpoint of alleviating the instability of the plating surface condition, the conditions other than the above are preferably in the range of pH 7.1 to 9.5, and the solution temperature is preferably in the range of 45 to 55 ° C.
（無水クロム酸溶液中での電解処理）
本発明では、クロム酸系の処理液として、無水クロム酸を主成分として含み、さらに助剤として硫酸を含むことが好ましい。これらの浴中で陰極電解処理を行うことで、金属クロム層とクロム水和酸化物層を形成させ、耐食性と塗料密着性を良好とし、さらに錫酸化物の経時生成を抑制する。
(Electrolytic treatment in chromic anhydride solution)
In the present invention, the chromic acid-based treatment liquid preferably contains chromic anhydride as a main component, and further contains sulfuric acid as an auxiliary agent. By performing cathodic electrolytic treatment in these baths, a metal chromium layer and a chromium hydrated oxide layer are formed, corrosion resistance and paint adhesion are improved, and formation of tin oxide over time is suppressed.
無水クロム酸溶液は、無水クロム酸を１０〜６０ｇ／ｌ含有する必要があり、さらに該溶液には、ｐＨを適正に制御して電解効率を向上、安定化させるために、助剤として、硫酸、フッ化ナトリウム、ほうフッ化ナトリウムのうちから選ばれる１種または２種以上を含有させることができる。硫酸を単独で含有させるときは、硫酸を０．０７〜０．５０ｇ／ｌ含有させることが望ましい。無水クロム酸含有量が１０ｇ／ｌ未満又は６０ｇ／ｌ超になると、化成処理皮膜の析出が不均一になり、化成処理皮膜が青みの色調となる。助剤の硫酸含有量が０．０７ｇ／ｌ未満又は０．５０ｇ／ｌ超になると、化成皮膜が均一に析出する作用が低下し、析出が不安定になり、外観が著しく劣化する。 The chromic anhydride solution needs to contain 10 to 60 g / l of chromic anhydride. Further, the solution contains sulfuric acid as an auxiliary agent in order to improve and stabilize electrolytic efficiency by appropriately controlling pH. 1 type, or 2 or more types chosen from sodium fluoride and sodium borofluoride can be contained. When sulfuric acid is contained alone, it is desirable to contain 0.07 to 0.50 g / l of sulfuric acid. When the chromic anhydride content is less than 10 g / l or more than 60 g / l, the chemical conversion film is non-uniformly deposited, and the chemical conversion film has a bluish color tone. When the sulfuric acid content of the auxiliary agent is less than 0.07 g / l or more than 0.50 g / l, the effect of uniformly depositing the chemical conversion film is lowered, the deposition becomes unstable, and the appearance is remarkably deteriorated.
化成皮膜の析出をより安定化させ、さらに化成処理薬液コストを低減させる観点からは、無水クロム酸含有量は１４〜１６ｇ／ｌ、助剤の硫酸含有量は０．１０〜０．１５ｇ／ｌがより好ましい。 From the viewpoint of further stabilizing the conversion coating deposition and further reducing the chemical treatment chemical cost, the chromic anhydride content is 14-16 g / l, and the sulfuric acid content of the auxiliary is 0.10-0.15 g / l. Is more preferable.
無水クロム酸溶液温度は３０〜４０℃とする。化成皮膜の析出の不均一を抑制する点からは、無水クロム酸溶液温度の影響が特に大きい。溶液温度が４０℃以下で化成処理皮膜が青みの色調となるのを抑制する効果が顕著に発現され、３５℃以下で特に顕著に発現される。 The chromic anhydride solution temperature is 30-40 ° C. The influence of the chromic anhydride solution temperature is particularly large from the viewpoint of suppressing the non-uniformity of the chemical conversion film deposition. When the solution temperature is 40 ° C. or lower, the effect of suppressing the blue color tone of the chemical conversion film is remarkably exhibited, and particularly remarkable at 35 ° C. or lower.
無水クロム酸溶液中で電解処理を行い、鍍金表面に下層としてクロム量が５〜２０ｍｇ／ｍ2の金属クロム層と、その上層として金属クロム換算で１０〜３０ｍｇ／ｍ2のクロム水和酸化物層を形成する。 Electrolytic treatment is carried out in an anhydrous chromic acid solution, and a chromium metal hydration oxide having a chromium content of 5 to 20 mg / m 2 as a lower layer on the plating surface and a chromium hydrated oxide of 10 to 30 mg / m 2 in terms of metal chromium as the upper layer. Form a layer.
下層の金属クロム層のクロム付着量を５〜２０ｍｇ／ｍ2に限定するのは、５ｍｇ／ｍ2未満では耐食性と塗料密着性が低下し、２０ｍｇ／ｍ2超では溶接性が低下するためである。金属クロム層のクロム付着量を８ｍｇ／ｍ2以上に限定すると耐食性と塗料密着性がより優れ、また金属クロム層のクロム付着量を１４ｍｇ／ｍ2以下に限定すると溶接性がより優れるので、より好ましい。 To limit the chromium coating weight of the underlying metallic chromium layer to 5 to 20 mg / m 2 is because the it is less than 5 mg / m 2 reduced the corrosion resistance and paint adhesion decreases weldability at 20 mg / m 2 greater is there. When the chromium adhesion amount of the metal chromium layer is limited to 8 mg / m 2 or more, the corrosion resistance and paint adhesion are more excellent, and when the chromium adhesion amount of the metal chromium layer is limited to 14 mg / m 2 or less, the weldability is more excellent. preferable.
上層のクロム水和酸化物層の付着量を金属クロム換算で１０〜３０ｍｇ／ｍ2に限定するのは、１０ｍｇ／ｍ2未満では塗料密着性が低下し、３０ｍｇ／ｍ2超では溶接性が低下するためである。上層のクロム水和酸化物層の付着量は、金属クロム換算で１２ｍｇ／ｍ2以上に限定すると塗料密着性がより優れ、また１８ｍｇ／ｍ2以下に限定すると溶接性がより優れるので、より好ましい。 To limit the deposition amount of the upper layer of hydrated chromium oxide layer in 10 to 30 mg / m 2 reckoned as metal chromium is reduced paint adhesion is less than 10 mg / m 2, weldability is 30 mg / m 2 than is It is because it falls. The adhesion amount of the upper chromium hydrated oxide layer is more preferable because it is more excellent in paint adhesion when it is limited to 12 mg / m 2 or more in terms of metallic chromium and more excellent when it is limited to 18 mg / m 2 or less. .
無水クロム酸含有溶液中の電解処理では、電解による金属クロムとクロム水和酸化物の析出反応と溶液中の浸漬によるクロム水和酸化物の溶解反応が並行して起こっている。下層の金属クロム層と上層のクロム水和酸化物層の付着量は、主に電解電気量と無水クロム酸濃度を調整することで所望の付着量に調整される。 In electrolytic treatment in a chromic anhydride-containing solution, a precipitation reaction of metallic chromium and chromium hydrated oxide by electrolysis and a dissolution reaction of chromium hydrated oxide by immersion in the solution occur in parallel. The adhesion amount of the lower metal chromium layer and the upper chromium hydrated oxide layer is adjusted to a desired adhesion amount mainly by adjusting the amount of electrolysis and the concentration of chromic anhydride.
前記で製造される錫鍍金鋼板は、表面の青みの色調が抑制されて外観に優れ、また塗料密着性、耐食性、溶接性に優れる。 The tin-plated steel sheet produced as described above is excellent in appearance due to the suppression of the bluish color tone of the surface, and excellent in paint adhesion, corrosion resistance, and weldability.
厚さ０．２０〜０．４０ｍｍの冷延鋼板を１０％の水酸化ナトリウム水溶液中で電解脱脂し、水洗し、７％硫酸溶液中に浸漬酸洗し、水洗した後、公知の錫鍍金浴中で２．８ｇ／ｍ2（片面あたり）の錫鍍金を施し、次いでリフローで錫を溶融した。前記得た鍍金鋼板を、炭酸ソーダ水溶液中で陰極処理し、水洗後、硫酸を含むクロム酸溶液中で鋼板を陰極として電解処理を行い、金属クロム層とクロム水和酸化物層を形成させた。さらに水洗後、乾燥した。錫鍍金鋼板の製造条件を表１に記載する。 A cold rolled steel sheet having a thickness of 0.20 to 0.40 mm is electrolytically degreased in a 10% aqueous sodium hydroxide solution, washed with water, dipped in a 7% sulfuric acid solution, washed with water, and then washed with a known tin plating bath. Inside, tin plating of 2.8 g / m 2 (per one side) was applied, and then tin was melted by reflow. The obtained plated steel sheet was subjected to cathode treatment in a sodium carbonate aqueous solution, washed with water, and then subjected to electrolytic treatment using a steel sheet as a cathode in a chromic acid solution containing sulfuric acid to form a metal chromium layer and a chromium hydrated oxide layer. . Further, it was washed with water and dried. The production conditions for the tin-plated steel sheet are shown in Table 1.
前記で製造した錫鍍金鋼板の金属クロム、クロム水和酸化物の付着量を調査し、また、表面外観、塗料密着性、耐食性を評価した。表面外観、塗料密着性、耐食性の評価方法を以下に記載する。 The amount of metallic chromium and chromium hydrated oxide deposited on the tin-plated steel sheet produced above was investigated, and the surface appearance, paint adhesion, and corrosion resistance were evaluated. The methods for evaluating surface appearance, paint adhesion, and corrosion resistance are described below.
（表面外観）
錫めっき鋼板の表面を目視観察し、表面の青み色調の程度に応じて以下のように評価した。
○：青みが目立たないもの。
△：やや青みが目立つもの。
×：著しく青みが目立つもの。
(Surface appearance)
The surface of the tin-plated steel sheet was visually observed and evaluated as follows according to the degree of blueness of the surface.
○: Blue is not conspicuous.
Δ: Slightly conspicuous blue.
X: The one where the bluish color is remarkably conspicuous.
（塗料密着性）
幅７０ｍｍ×長さ１６０ｍｍに切断した試料を、２１０℃で１０分空焼き後、その表面にエポキシフェノール系塗料を５ｇ／ｍ2塗布し、２０５℃×１０分間焼き付けた。この試料の塗装面にカッターナイフで鋼素地に達するクロスカット状の疵を入れた後、その表面にニチバンテープ（幅２４ｍｍ）を密着させ、次いで密着させたニチバンテープを一気に剥がし、塗膜の剥離状態を観察し、剥離のないものを「○」、剥離のあるものを「×」とした。
(Paint adhesion)
A sample cut to a width of 70 mm and a length of 160 mm was air-baked at 210 ° C. for 10 minutes, and then 5 g / m 2 of an epoxyphenol-based paint was applied to the surface and baked at 205 ° C. for 10 minutes. After putting a crosscut-shaped wrinkle that reaches the steel base with a cutter knife on the painted surface of this sample, the Nichiban tape (width 24 mm) is adhered to the surface, and then the adhered Nichiban tape is peeled off at once, and the coating film is peeled off. The state was observed, and “◯” indicates that there was no peeling, and “X” indicates that there was peeling.
（耐食性）
幅５０ｍｍ×長さ１５０ｍｍに切断した試料を、塗料密着性試験に供した試料の作成と同様の条件で、空焼、塗装、焼き付けを行い、次いでこの試料の塗装面にカッターナイフで鋼素地に達するクロスカット状の疵を入れた後、エリクセン加工を行って高さ５ｍｍの押出し加工を行い、その端部をシールした。前記で作成した試料を、クエン酸：１５ｇ／ｌ、ＮａＣｌ：１５ｇ／ｌを含有する酸溶液中に２０時間浸漬し、その表面にニチバンテープ（幅２４ｍｍ）を密着させ、次いで密着させたニチバンテープを一気に剥がし、塗膜剥離部分の錆発生の有無を観察し、錆発生のないものを「○」、錆発生のあるものを「×」とした。
(Corrosion resistance)
A sample cut to a width of 50 mm and a length of 150 mm is baked, painted, and baked under the same conditions as for the preparation of the sample used in the paint adhesion test. After reaching the cross-cut wrinkles that reached, Erichsen processing was performed to perform extrusion processing at a height of 5 mm, and the ends were sealed. The sample prepared above was immersed in an acid solution containing citric acid: 15 g / l and NaCl: 15 g / l for 20 hours, and Nichiban tape (width 24 mm) was adhered to the surface, and then the Nichiban tape was adhered. The film was peeled off at a stretch, and the presence or absence of rust generation at the part where the coating film was peeled was observed.
評価結果を表１に併せて記載した。 The evaluation results are also shown in Table 1.
本発明範囲の発明例の鋼板は、ライン速度が２００ｍｐｍ以下の低速であっても表面の青みの色調を抑制されて外観評価が良好であり、また塗料密着性、耐食性も優れている。これに対して、本発明範囲を外れる比較例の鋼板は、外観評価、塗料密着性、耐食性のうちの少なくとも１の特性が劣る。 The steel sheet of the invention example within the scope of the present invention has a good appearance evaluation because the color tone of the surface bluish is suppressed even at a low line speed of 200 mpm or less, and has excellent paint adhesion and corrosion resistance. On the other hand, the steel plate of the comparative example outside the scope of the present invention is inferior in at least one characteristic among appearance evaluation, paint adhesion, and corrosion resistance.
本発明は、表面の青みの色調が抑制され、外観と塗料密着性に優れる錫鍍金鋼板の製造方法として利用できる。 INDUSTRIAL APPLICABILITY The present invention can be used as a method for producing a tin-plated steel sheet that suppresses the blue tone of the surface and is excellent in appearance and paint adhesion.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103847162A (en) * | 2014-02-21 | 2014-06-11 | 苏州米达思精密电子有限公司 | Surface gold-plated golden reinforcing piece and preparation process thereof |
| US20150337448A1 (en) * | 2012-11-21 | 2015-11-26 | Tata Steel Ijmuiden B.V. | Chromium-chromium oxide coatings applied to steel substrates for packaging applications and a method for producing said coatings |
| US10000861B2 (en) | 2012-03-30 | 2018-06-19 | Tata Steel Ijmuiden Bv | Coated substrate for packaging applications and a method for producing said coated substrate |
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2004
- 2004-01-29 JP JP2004021284A patent/JP2005213580A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10000861B2 (en) | 2012-03-30 | 2018-06-19 | Tata Steel Ijmuiden Bv | Coated substrate for packaging applications and a method for producing said coated substrate |
| US20150337448A1 (en) * | 2012-11-21 | 2015-11-26 | Tata Steel Ijmuiden B.V. | Chromium-chromium oxide coatings applied to steel substrates for packaging applications and a method for producing said coatings |
| CN103847162A (en) * | 2014-02-21 | 2014-06-11 | 苏州米达思精密电子有限公司 | Surface gold-plated golden reinforcing piece and preparation process thereof |
| CN103847162B (en) * | 2014-02-21 | 2016-01-27 | 苏州米达思精密电子有限公司 | A kind of golden reinforcing chip of surface gold-plating and preparation technology thereof |
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