JP2000080498A - Chemical treatment of tin group plated steel plate - Google Patents
Chemical treatment of tin group plated steel plateInfo
- Publication number
- JP2000080498A JP2000080498A JP10246645A JP24664598A JP2000080498A JP 2000080498 A JP2000080498 A JP 2000080498A JP 10246645 A JP10246645 A JP 10246645A JP 24664598 A JP24664598 A JP 24664598A JP 2000080498 A JP2000080498 A JP 2000080498A
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- Prior art keywords
- treatment
- bath
- plated steel
- tin
- temp
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、錫系めっき鋼板に
塗料密着性及び耐食性及び溶接性に優れた化学処理被膜
を形成させる方法に関するものである。The present invention relates to a method for forming a chemically treated film having excellent paint adhesion, corrosion resistance and weldability on a tin-based plated steel sheet.
【０００２】[0002]
【従来の技術】錫めっき鋼板は、缶詰、乾電池など種々
の金属容器用の材料として広く使用されているが、近年
錫の付着量を低減し、缶内外に塗装を施して耐食性を確
保するという使われ方が増加している。この場合塗膜密
着性の良否が耐食性を左右する重要な因子となる。錫め
っき鋼板の塗膜密着性を高める方法として硫酸、フッ素
化合物などを助剤として含有する無水クロム酸系処理浴
中で陰極電解することにより、金属クロム（以下、Ｍｅ
−Ｃｒという）と水和酸化クロム（以下、Ｏｘ−Ｃｒと
いう）からなる被膜を形成させる方法が知られている
が、単に無水クロム酸系浴中で陰極電解処理を行っただ
けでは下記のような問題点がある。すなわち、塗料密着
性向上を得るのに必要なＭｅ−Ｃｒ量を生成させた場
合、同時に生成するＯｘ−Ｃｒ量が多くなり過ぎる傾向
にあり、シーム溶接性を損なうとともに、Ｏｘ−Ｃｒ生
成量の不均一による外観ムラが生じやすい。2. Description of the Related Art Tin-plated steel sheets are widely used as materials for various metal containers such as cans and dry batteries. In recent years, however, tin-coated steel sheets have been reduced in the amount of tin adhered and painted inside and outside the can to ensure corrosion resistance. Usage is increasing. In this case, the quality of the coating film adhesion is an important factor that determines the corrosion resistance. As a method of improving the adhesion of the coating film of the tin-plated steel sheet, cathodic electrolysis is performed in a chromic anhydride-based treatment bath containing sulfuric acid, a fluorine compound, or the like as an auxiliary, so that metal chromium (hereinafter, Me)
A method of forming a film composed of chromium oxide (hereinafter referred to as Ox-Cr) and hydrated chromium oxide (hereinafter referred to as Ox-Cr) is known. Problems. That is, when the amount of Me-Cr necessary to improve the paint adhesion is generated, the amount of Ox-Cr generated simultaneously tends to be too large, which impairs the seam weldability and reduces the amount of Ox-Cr generated. Appearance unevenness due to unevenness is likely to occur.
【０００３】この問題を解決するために、Ｏｘ−Ｃｒ量
の低減及びこれに伴う半田性、溶接性、外観均一性、塗
料密着性の向上効果をもたらす技術として特開昭６１−
１２８９６号公報、特開平５−２４７６８８号公報では
通常より硫酸根含有率の低い無水クロム酸水溶液中での
陰極電解処理に引き続いて、比較的高濃度の無水クロム
酸水溶液への浸漬処理を行う処理法を発明している。確
かにこのような発明による製造方法は、半田性、溶接
性、外観均一性、塗料密着性の向上効果をもたらす。In order to solve this problem, Japanese Patent Application Laid-Open No. Sho 61-61 discloses a technique for reducing the amount of Ox-Cr and concomitantly improving the solderability, weldability, appearance uniformity, and paint adhesion.
In JP-A No. 12896 and JP-A-5-247688, a treatment of performing a cathodic electrolysis treatment in a chromic anhydride aqueous solution having a lower sulfate content than usual, followed by a dipping treatment in a relatively high-concentration chromic anhydride aqueous solution. Inventing the law. Certainly, such a manufacturing method according to the present invention has effects of improving solderability, weldability, appearance uniformity, and paint adhesion.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この製
造方法の無水クロム酸系浴中において電解で生成したＯ
ｘ−Ｃｒは溶解速度が遅く、かつ浸漬処理浴中クロム酸
濃度が高濃度であるため塗料密着性に優れているオキソ
型主体のＯｘ−Ｃｒまで溶解してしまう可能性がある。
そこで、発明者らは誠意検討した結果、浸漬浴中の無水
クロム酸濃度を低下させオキソ型主体のＯｘ−Ｃｒの溶
解を防ぎ、かつ、オール型主体のＯｘ−Ｃｒを効率的に
溶解除去するため浸漬処理浴中の無水クロム酸量の低減
により解決することができることを見出した。However, the O.sub.2 formed by electrolysis in a chromic anhydride-based bath of this production method is not suitable.
Since x-Cr has a slow dissolution rate and a high concentration of chromic acid in the immersion bath, there is a possibility that oxo-based Ox-Cr having excellent paint adhesion may be dissolved.
Then, as a result of the inventor's sincere examination, the concentration of chromic anhydride in the immersion bath is reduced to prevent the dissolution of oxo-type main Ox-Cr, and to efficiently dissolve and remove the all-type main Ox-Cr. Therefore, it has been found that the problem can be solved by reducing the amount of chromic anhydride in the immersion treatment bath.
【０００５】また、陰極電解処理浴温度を低下するほど
Ｏｘ−Ｃｒの被覆性は共に良好で、また、Ｏｘ−Ｃｒ量
は増加するものの、このとき生成したＯｘ−Ｃｒ被膜中
上層のオール型主体のＯｘ−Ｃｒは硫酸イオンの共析量
が多いため溶解性が高く、電解した後高温の低濃度無水
クロム酸浴に浸漬処理することで容易に溶解することが
でき、さらに、以上の処理により生成した皮膜を高温水
で洗浄することにより皮膜中の硫酸根やクロム酸イオン
等の不純物を効率的に除去でき塗料密着性が更に向上す
ることを突き止めた。すなわち、本発明は所定の浴組
成、浴温での陰極電解及び浸漬，さらに高温水洗処理に
よりＯｘ−Ｃｒの良質化を図り、半田性、溶接性、外観
均一性の向上、さらに塗料密着性に対しても著しい効果
をもたらす錫系めっき鋼板の化学処理方法を提供するこ
とを目的としている。The lower the temperature of the cathodic electrolysis bath, the better the coatability of Ox-Cr, and the higher the amount of Ox-Cr, but the all-type main layer in the Ox-Cr film formed at this time is the upper layer. Ox-Cr has a high solubility due to the large amount of eutectoid of sulfate ions, and can be easily dissolved by immersion in a high-temperature, low-concentration chromic anhydride bath after electrolysis. It has been found that by washing the formed film with high-temperature water, impurities such as sulfate groups and chromate ions in the film can be efficiently removed, and the adhesiveness of the paint can be further improved. That is, the present invention improves the quality of Ox-Cr by cathodic electrolysis and immersion at a predetermined bath composition and bath temperature, and furthermore, performs high-temperature water-washing treatment to improve solderability, weldability, appearance uniformity, and paint adhesion. It is an object of the present invention to provide a method for chemically treating a tin-based plated steel sheet that has a remarkable effect.
【０００６】[0006]
【課題を解決するための手段】本発明の要旨は次の通り
である。 （１）錫系めっき鋼板に５ｇ〜３０ｇ／ｌ以下のＣｒＯ
3 及びＣｒＯ3 との重量比で１／５０〜１／３００のＨ
2 ＳＯ4 を含む処理浴中で陰極電解を行い、引き続いて
３０ｇ／ｌ超〜５０ｇ／ｌ未満のＣｒＯ3 を含んだ処理
浴中で浸漬処理を行うことを特徴とする錫系めっき鋼板
の化学処理法。 （２）陰極電解処理浴中の温度が４５℃以下であること
を特徴とする前記（１）に記載の錫系めっき鋼板の化学
処理法。The gist of the present invention is as follows. (1) 5 g to 30 g / l or less of CrO on tin-based plated steel sheet
H in a weight ratio of 1/50 to 1/300 with 3 and CrO 3
2. Catalytic electrolysis in a treatment bath containing 2 SO 4 , followed by immersion treatment in a treatment bath containing more than 30 g / l to less than 50 g / l of CrO 3 , characterized in that the tin-plated steel sheet is chemically treated. Processing method. (2) The chemical treatment method for a tin-based plated steel sheet according to (1), wherein the temperature in the cathodic electrolysis treatment bath is 45 ° C. or less.
【０００７】（３）浸漬処理浴中の温度が５０℃以上で
あることを特徴とする前記（１）、（２）に記載の錫系
めっき鋼板の化学処理法。 （４）前記（１）〜（３）の処理により得られた所定量
の皮膜を更にｐＨ４以上、６５〜１００℃、０．２秒以
上の高温水処理を行うことを特徴とする錫系めっき鋼板
の化学処理法にある。(3) The method for chemically treating a tin-based plated steel sheet according to the above (1) or (2), wherein the temperature in the immersion treatment bath is 50 ° C. or more. (4) Tin-based plating characterized by further subjecting a predetermined amount of the film obtained by the treatments (1) to (3) to a high-temperature water treatment at a pH of 4 or more, 65 to 100 ° C, and 0.2 seconds or more. It is in the chemical treatment of steel sheet.
【０００８】以下、本発明をさらに詳細に説明する。本
発明において、錫系めっき鋼板とは一般に“ぶりき”と
呼ばれる通常の錫めっき鋼板だけでなく、いわゆる溶接
缶などの用途に用いられる錫付着量低減による耐食性低
下を何らかの方法で補った種々の材料（すなわちＮｉな
ど錫以外の金属を含有させた錫系合金めっき鋼板、Ｎ
ｉ、Ｆｅ−Ｎｉなどの下地めっき処理あるいは、Ｎｉめ
っきを施しさらに熱拡散処理を施した下地層上に薄目付
錫めっきを施した錫系積層めっき鋼板など）が対象とな
り、これらのいずれに対しても本発明方法の適用が可能
である。Hereinafter, the present invention will be described in more detail. In the present invention, the tin-based plated steel sheet is not only a normal tin-plated steel sheet generally called “tinplate”, but also various methods for compensating for a decrease in corrosion resistance due to a reduction in the amount of tin used in applications such as so-called welding cans by any method. Materials (ie, tin-based alloy-coated steel sheets containing metals other than tin such as Ni, N
i, Fe-Ni or the like, or a tin-based laminated steel sheet in which a thin tin plating is applied on an underlayer that has been subjected to Ni plating and further subjected to heat diffusion treatment). However, the method of the present invention can be applied.
【０００９】錫系のめっきを施した後、めっき表面の酸
化物等を除去するためにｐＨ４以下の酸溶液中での陰極
電解あるいは浸漬処理など表面活性処理を行うことが好
ましい。ただし、ノーリフロー仕上げのめっきなど表面
の活性なものに対してはこのような表面活性処理は行わ
なくてもかまわない。処理条件としては通常のぶりきで
実施される条件と同一で良く、具体的には浴濃度２〜１
０％硫酸、浴温３０〜８０℃の酸性浴に浸漬処理する
か、あるいは前記酸性浴中で陰極電気量密度５Ａ／ｄｍ
2 程度以下の陰極電解処理を行えばよい。After the tin-based plating, a surface activation treatment such as cathodic electrolysis or immersion treatment in an acid solution having a pH of 4 or less is preferably performed to remove oxides and the like on the plating surface. However, such a surface active treatment may not be performed on a surface active material such as a no-reflow finish plating. The treatment conditions may be the same as those used in normal tinting, and specifically, the bath concentration is 2 to 1
0% sulfuric acid, immersion treatment in an acidic bath at a bath temperature of 30 to 80 ° C., or a cathode charge density of 5 A / dm.
A cathode electrolysis treatment of about 2 or less may be performed.
【００１０】上記の表面活性化処理及び水洗の後に、請
求項記載の低温無水クロム酸系浴中で陰極電解処理及び
高温無水クロム酸系浴中への浸漬処理によりＭｅ−Ｃｒ
とＯｘ−Ｃｒからなる被膜を形成させるがその付着量は
それぞれ０．５〜２０ｍｇ／ｍ2 及び０．５〜１５ｍｇ
／ｍ2 （いづれも片面当たり）が望ましい。このような
低付着量で均一なＭｅ−Ｃｒ被膜を形成させるために
は、電解処理浴中に含まれるＣｒＯ3 濃度を５ｇ／ｌ以
上にするのが望ましく、あまり高すぎると塗料・フィル
ム密着性の低下が生じるため５０ｇ／ｌを上限とする必
要がある。After the above-mentioned surface activation treatment and washing with water, Me-Cr is subjected to a cathodic electrolysis treatment in a low-temperature chromic anhydride-based bath and a immersion treatment in a high-temperature chromic anhydride-based bath as set forth in the claims.
And Ox-Cr, and the coating amount is 0.5 to 20 mg / m 2 and 0.5 to 15 mg, respectively.
/ M 2 (both per side). In order to form a uniform Me—Cr coating with such a small amount of adhesion, it is desirable that the concentration of CrO 3 contained in the electrolytic treatment bath be 5 g / l or more. Is required to be 50 g / l as the upper limit.
【００１１】処理浴への硫酸添加はＭｅ−Ｃｒの生成に
は不可欠であり、無水クロム酸に対する重量比（以下硫
酸濃度比という）１／３００〜１／５０とする必要があ
る。硫酸濃度比は、高すぎても低すぎてもＭｅ−Ｃｒ電
析効率が著しく低下するので、硫酸濃度比の下限は１／
２００、上限は１／５０とする。なお、上記電解処理浴
はＭｅ−Ｃｒ析出助剤として、硫酸以外にケイフッ化ナ
トリウム、ホウフッ化ナトリウム、フッ化アンモニウム
などのフッ素化合物を含有してもかまわない。また、処
理浴中への三価のクロムイオンの混入量が０．１〜５ｇ
／ｌではクロメート被膜の均一化に効果があるので混入
してもかまわない。The addition of sulfuric acid to the treatment bath is indispensable for the generation of Me-Cr, and it is necessary to make the weight ratio to chromic anhydride (hereinafter referred to as sulfuric acid concentration ratio) 1/300 to 1/50. If the sulfuric acid concentration ratio is too high or too low, the Me-Cr electrodeposition efficiency is remarkably reduced.
200, the upper limit is 1/50. The electrolytic treatment bath may contain a fluorine compound such as sodium silicofluoride, sodium borofluoride, or ammonium fluoride as a Me-Cr deposition aid in addition to sulfuric acid. The amount of trivalent chromium ions mixed into the treatment bath is 0.1 to 5 g.
Since / 1 is effective in making the chromate film uniform, it may be mixed.
【００１２】陰極電解処理の際、浴温度の低下によりＭ
ｅ−Ｃｒの均一被覆性が向上するので電解処理の浴温度
を４５℃以下にするのが望ましい。電解処理浴温の下限
については特に設けないがあまり低すぎると強力な冷却
器の設置が必要となり不経済であるため、１０℃を下限
とするのが好ましい。上記処理条件での陰極電解処理に
引き続いて、この陰極電解処理で過剰に生成したオール
型主体のＯｘ−Ｃｒ量の溶解除去による塗膜密着性の向
上を目的とした無水クロム酸水溶液浸漬処理が行われ
る。During the cathodic electrolysis, the bath temperature decreases and
The bath temperature of the electrolytic treatment is desirably set to 45 ° C. or lower because the uniform coverage of e-Cr is improved. The lower limit of the electrolytic treatment bath temperature is not particularly set, but if it is too low, a powerful cooler must be installed, which is uneconomical. Therefore, the lower limit is preferably set to 10 ° C. Subsequent to the cathodic electrolysis treatment under the above treatment conditions, a chromic anhydride aqueous solution immersion treatment for the purpose of improving coating film adhesion by dissolving and removing the amount of all-type Ox-Cr excessively generated by the cathodic electrolysis treatment is performed. Done.
【００１３】オール型主体Ｏｘ−Ｃｒの溶解については
浸漬処理浴中の無水クロム酸濃度が３０ｇ／ｌ以下では
オール型Ｏｘ−Ｃｒを溶解する能力が著しく低下するた
め、これ以上の濃度が望ましく、５０ｇ／ｌ以上の高濃
度とすると、エッチング作用が強すぎてオキソ型主体の
Ｏｘ−Ｃｒも溶解されるため塗料密着性、耐食性の低下
につながることがある。そこで無水クロム酸濃度の上限
を５０ｇ／ｌ未満とすることが必要である。また、能力
は浴温の上昇と共に増加し、効率的に溶解させるために
は５０℃以上の浴温にすることが望ましい。浴温の上限
は特に規定しないが、あまり高温にすると浴のヒューム
回収が大がかりとなり不経済であるため、８０℃を上限
とするのが好ましい。With respect to dissolution of the all-type main Ox-Cr, if the chromic anhydride concentration in the immersion treatment bath is 30 g / l or less, the ability to dissolve the all-type Ox-Cr is remarkably reduced. If the concentration is 50 g / l or more, the etching action is too strong and the oxo-type Ox-Cr is also dissolved, which may lead to a decrease in paint adhesion and corrosion resistance. Therefore, it is necessary to set the upper limit of the chromic anhydride concentration to less than 50 g / l. Further, the capacity increases as the bath temperature rises, and it is desirable to set the bath temperature to 50 ° C. or higher for efficient dissolution. The upper limit of the bath temperature is not particularly specified, but if the temperature is too high, the fume recovery of the bath becomes large and it is uneconomical. Therefore, it is preferable to set the upper limit to 80 ° C.
【００１４】なお、浸漬処理浴中には無水クロム酸以外
に三価のクロム酸イオン、硫酸、ケイフッ化ナトリウ
ム、ホウフッ化ナトリウム、フッ化アンモニウムなどの
フッ素化合物等を含有してもかまわない。さらに、以上
の処理を施し所定量の皮膜を形成させた後、皮膜中の硫
酸イオンやクロム酸イオン等の不純物が存在すると塗料
密着性が著しく低下するため、十分な水洗浄が必要とな
る。連続製造ラインでは短時間での効率的な水洗浄のた
め６５℃以上の温度が必要である。また、水のｐＨが低
くなるとＯｘ−Ｃｒ自体が溶解されるのでｐＨは４以上
必要である。その処理時間は０．２秒未満の短時間では
効果が乏しいため０．２秒以上の洗浄が必要である。The immersion bath may contain, in addition to chromic anhydride, trivalent chromate ions, sulfuric acid, fluorine compounds such as sodium silicofluoride, sodium borofluoride and ammonium fluoride. Further, after a predetermined amount of the film is formed by performing the above-mentioned treatment, if impurities such as sulfate ions and chromate ions are present in the film, the adhesion of the paint is remarkably reduced, so that sufficient water washing is required. In a continuous production line, a temperature of 65 ° C. or more is required for efficient water washing in a short time. Further, when the pH of water is lowered, Ox-Cr itself is dissolved, so that the pH needs to be 4 or more. If the treatment time is shorter than 0.2 seconds, the effect is poor, and cleaning for 0.2 seconds or more is required.
【００１５】以下、本発明の実施例について説明する。Hereinafter, embodiments of the present invention will be described.
【実施例】冷間圧延、焼鈍及び調質圧延を施した鋼板
に、脱脂・酸洗したのちフェロスタン浴により片面当た
り２．８ｇ／ｍ2 の錫めっき及び加熱溶融処理を施した
素材α、および脱脂・酸洗したのちＦｅ−Ｎｉめっきを
行った後フェロスタン浴により片面当たり１．２ｇ／ｍ
2 の錫めっき及び加熱溶融処理を施した素材βに種々の
条件で化学処理を施し、外観均一性、シーム溶接性、塗
膜密着性、耐食性への影響を調べた。なお、ノーリフロ
ー仕上げのめっき鋼板以外のものは、各化学処理に先立
って、５％硫酸溶液（常温）中４Ａ／ｄｍ2 の陰極電解
処理による表面活性化を実施した。Example: A material α obtained by subjecting a steel sheet subjected to cold rolling, annealing and temper rolling to degrease and pickling, then tin plating of 2.8 g / m 2 per side by a ferrostan bath and heat melting treatment, and After degreased and pickled, Fe-Ni plating was performed, and a ferrostan bath was used to obtain 1.2 g / m2 per side.
The material β subjected to tin plating and heat melting treatment was chemically treated under various conditions, and the effects on appearance uniformity, seam weldability, coating film adhesion, and corrosion resistance were examined. In addition, except for the no-reflow finish plated steel sheet, surface activation was performed by a cathodic electrolytic treatment of 4 A / dm 2 in a 5% sulfuric acid solution (normal temperature) prior to each chemical treatment.
【００１６】各処理材について、以下に示す（Ａ）〜
（Ｄ）の各項目について実施し、その性能を評価した。 （Ａ）外観均一性 目視により下記の通り評価した。 〇：色調ムラ無し ×：色調ムラ有りFor each treatment material, the following (A) to (A)
Each item of (D) was performed, and the performance was evaluated. (A) Uniformity of appearance It was visually evaluated as follows. 〇: No color tone unevenness ×: Color tone unevenness
【００１７】（Ｂ）シーム溶接性 ラップ代０．５ｍｍ、加圧力４５ｋｇｆ、溶接ワイヤー
スピード１００ｍ／ｍｉｎの条件で、電流を変更して溶
接を実施し十分な溶接強度が得られる最小電流値とチリ
などの溶接欠陥が目立ち始める最大電流値からなる適正
電流範囲の広さから総合的に判断し、３段階（◎：非常
に広い、〇：実用上問題なし、×：狭い）で評価した。(B) Seam weldability Under the conditions of a lap margin of 0.5 mm, a pressing force of 45 kgf, and a welding wire speed of 100 m / min, the current is changed and welding is performed. Judgment was made comprehensively from the width of the appropriate current range consisting of the maximum current value at which welding defects at which the welding defects start to stand out were evaluated in three stages (段 階: very wide, Δ: no problem in practical use, ×: narrow).
【００１８】（Ｃ）塗料密着性 試験片の缶内面側に相当する面にエポキシフェノール系
の塗料を５５ｍｇ／ｄｍ2 塗布し、さらに缶外面に相当
する面にクリヤーラッカーを４０ｍｇ／ｄｍ2塗布し、
２９０℃まで１５ｓｅｃの焼き付け条件で乾燥硬化し
た。引き続き、各々の面に１ｍｍ間隔でスクラッチを入
れ、１００個の碁盤目を作製し、速やかにテープ剥離
し、その剥離状況を観察し、３段階（◎：剥離無し、
〇：１〜４個剥離、×：５個以上剥離）で塗料密着性を
評価した。(C) Adhesiveness of paint The epoxyphenol-based paint is applied at 55 mg / dm 2 on the surface corresponding to the inner surface of the can of the test piece, and the clear lacquer is applied at 40 mg / dm 2 on the surface corresponding to the outer surface of can. ,
Drying and curing were performed under a baking condition of 15 seconds up to 290 ° C. Subsequently, scratches were made on each surface at intervals of 1 mm to prepare 100 grids, the tape was peeled off promptly, the peeling state was observed, and three stages (、 ３: no peeling,
Δ: 1 to 4 pieces peeled, ×: 5 or more pieces peeled) to evaluate paint adhesion.
【００１９】（Ｄ）ＵＣＣ（アンダーカッティングコロ
ージョン）評価テスト 試験片の缶内面に相当する面の耐食性を評価するため、
缶内面側に相当する面に厚さ１５μｍのＰＥＴ（ポリエ
チレンテレフタレート）系フィルムをラミネートした。
その後地鉄に達するまでクロスカットを入れ、１．５％
クエン酸−１．５％食塩混合液からなる試験液中に大気
開放下５５℃×４日間浸漬した。試験終了後、速やかに
スクラッチ部および平面部をテープで剥離して、スクラ
ッチ部近傍の腐食状況、スクラッチ部のピッティング状
況および平面部のフィルム剥離状況を３段階（◎：剥離
が無く腐食も認められない、〇：僅かな剥離があるが腐
食は認められない、×：大部分で剥離し激しい腐食が認
められる）で総合的に評価した。表１に示すように、本
発明により化学処理された錫系めっき鋼板は、優れたシ
ーム溶接性、塗料密着性および耐食性を有することが明
らかになった。(D) UCC (Undercutting Corrosion) Evaluation Test In order to evaluate the corrosion resistance of the surface of the test piece corresponding to the inner surface of the can,
A PET (polyethylene terephthalate) film having a thickness of 15 μm was laminated on a surface corresponding to the inner surface of the can.
After that, make a cross cut until the steel reaches 1.5%
It was immersed in a test solution composed of a citric acid-1.5% salt mixture at 55 ° C. for 4 days in the open to the atmosphere. After the test is completed, the scratch part and the flat part are immediately peeled off with a tape, and the corrosion state near the scratch part, the pitting state of the scratch part, and the film peeling state of the flat part are evaluated in three stages. Not observed, Δ: slight peeling but no corrosion was observed, x: peeling was observed in most parts and severe corrosion was observed). As shown in Table 1, the tin-plated steel sheet chemically treated according to the present invention was found to have excellent seam weldability, paint adhesion, and corrosion resistance.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】以上述べたように、本発明により化学処
理された錫系めっき鋼板は、極めて優れたシーム溶接
性、塗料密着性および耐食性を有するものである。As described above, the tin-plated steel sheet chemically treated according to the present invention has extremely excellent seam weldability, paint adhesion and corrosion resistance.
Claims (4)
のＣｒＯ3 及びＣｒＯ3 との重量比で１／５０〜１／３
００のＨ2 ＳＯ4 を含む処理浴中で陰極電解を行い、引
き続いて３０ｇ／ｌ超〜５０ｇ／ｌ未満のＣｒＯ3 を含
んだ処理浴中で浸漬処理を行うことを特徴とする錫系め
っき鋼板の化学処理法。1. A tin-based plated steel sheet having a weight ratio of 5 to 30 g / l of CrO 3 and CrO 3 of 1/50 to 1/3.
Characterized in that cathodic electrolysis is carried out in a treatment bath containing H 2 SO 4 of 00 and subsequently immersion treatment is carried out in a treatment bath containing CrO 3 of more than 30 g / l to less than 50 g / l. Steel sheet chemical treatment.
あることを特徴とする請求項１に記載の錫系めっき鋼板
の化学処理法。2. The method according to claim 1, wherein the temperature in the cathodic electrolysis bath is 45 ° C. or lower.
ことを特徴とする請求項１、２に記載の錫系めっき鋼板
の化学処理法。3. The method according to claim 1, wherein the temperature in the immersion bath is 50 ° C. or higher.
量の皮膜を更にｐＨ４以上、６５〜１００℃、０．２秒
以上の高温水処理を行うことを特徴とする錫系めっき鋼
板の化学処理法。4. A tin-based plated steel sheet further comprising subjecting a predetermined amount of the film obtained by the treatment according to claims 1 to 3 to a high-temperature water treatment at a pH of 4 or more, 65 to 100 ° C. for 0.2 seconds or more. Chemical treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10246645A JP2000080498A (en) | 1998-09-01 | 1998-09-01 | Chemical treatment of tin group plated steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10246645A JP2000080498A (en) | 1998-09-01 | 1998-09-01 | Chemical treatment of tin group plated steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000080498A true JP2000080498A (en) | 2000-03-21 |
Family
ID=17151502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10246645A Pending JP2000080498A (en) | 1998-09-01 | 1998-09-01 | Chemical treatment of tin group plated steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000080498A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009025390A1 (en) * | 2007-08-23 | 2009-02-26 | Nippon Steel Corporation | Environmentally friendly steel sheet for container material, process for producing the same, and environmentally friendly laminated steel sheet for container material and precoated steel sheet for container material each produced from that steel sheet |
| CN108796584A (en) * | 2017-04-28 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of tin-plated product surface passivated membrane structural flexibility control method |
-
1998
- 1998-09-01 JP JP10246645A patent/JP2000080498A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009025390A1 (en) * | 2007-08-23 | 2009-02-26 | Nippon Steel Corporation | Environmentally friendly steel sheet for container material, process for producing the same, and environmentally friendly laminated steel sheet for container material and precoated steel sheet for container material each produced from that steel sheet |
| JP2009068108A (en) * | 2007-08-23 | 2009-04-02 | Nippon Steel Corp | Steel sheet for container materials with less loading to circumstance, its manufacturing method, laminate steel sheet for container materials with less loading to circumstance using this, coating precoated steel sheets for container materials, and these production methods |
| CN101784700B (en) * | 2007-08-23 | 2012-10-24 | 新日本制铁株式会社 | Environmentally friendly steel sheet for container material, process for producing the same, and environmentally friendly laminated steel sheet for container material and precoated steel sheet for container material each produced from that steel shee |
| US8404357B2 (en) | 2007-08-23 | 2013-03-26 | Nippon Steel & Sumitomo Metal Corporation | Environmentally-friendly steel sheet for a can or a container as well as laminated and pre-coated steel sheet by using it |
| TWI418653B (en) * | 2007-08-23 | 2013-12-11 | Nippon Steel & Sumitomo Metal Corp | A method for producing a steel sheet for a container material having a low environmental burden, a method for producing the same, and a method for producing the same, |
| CN108796584A (en) * | 2017-04-28 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of tin-plated product surface passivated membrane structural flexibility control method |
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