JP2625498B2 - Hot-dip aluminized steel sheet for can lid with excellent corrosion resistance - Google Patents
Hot-dip aluminized steel sheet for can lid with excellent corrosion resistanceInfo
- Publication number
- JP2625498B2 JP2625498B2 JP12819888A JP12819888A JP2625498B2 JP 2625498 B2 JP2625498 B2 JP 2625498B2 JP 12819888 A JP12819888 A JP 12819888A JP 12819888 A JP12819888 A JP 12819888A JP 2625498 B2 JP2625498 B2 JP 2625498B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- aluminum
- alloy layer
- film
- corrosion resistance
- 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
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は耐食性の優れた缶蓋用溶融アルミニウムめっ
き鋼板に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip aluminized steel sheet for a can lid having excellent corrosion resistance.
従来の技術 ビール・炭酸飲料あるいは一般飲料缶の分野におい
て、金属缶が、内容物の保存性、頑丈さ、外観の美麗
さ、価格等の多くの利点を有するため幅広く利用されて
いる。なかでも、缶蓋の一部を人間の手て容易に開けう
る易開缶性容器蓋は、屋外にて消費されることが多い飲
料缶の分野においては必須のものとなっている。2. Description of the Related Art In the field of beer / carbonated beverages or general beverage cans, metal cans are widely used because they have many advantages such as preservability of contents, toughness, beautiful appearance, and price. Above all, an easily openable container lid which can easily open a part of the can lid by a human hand is essential in the field of beverage cans which are often consumed outdoors.
この易開缶性容器蓋(以下EOE:Easy Open Endと略称
する)は、様々な方式により製造されているが、国内で
はスコア方式が最も多用されている。スコア方式とは、
開缶する部分を形どった切り込みを蓋素材に入れ、その
部分を人力により引き裂くことにより開缶する方式を示
している。人力により引く裂くためには、、力をかける
ための取手(以下タブと呼称する)が必要であり、この
タブを缶蓋に固定するには、リベット方式が採用されて
いる。リベット方式とは、機械的にタブをかしめる方式
を意味している。This easy-open container lid (hereinafter abbreviated as EOE: Easy Open End) is manufactured by various methods, but the score method is most frequently used in Japan. What is the scoring method?
This shows a method in which a notch that forms a part to be opened is put in a lid material, and the part is opened by tearing the part by human power. In order to tear by human power, a handle (hereinafter referred to as a tab) for applying force is required, and a rivet method is employed to fix the tab to the can lid. The rivet method means a method of mechanically swaging a tab.
現在、EOE用に使用されてる素材には、アルミニウム
とぶりき(錫めっき鋼板)がある。これらの素材は、表
裏に約5ミクロン程度の有機塗装後EOE成形に供される
が、スコア加工あるいはリベット加工はかなりの厳しい
加工であり、加工前に施された薄い塗膜には欠陥が生じ
易く、素材の耐食性が重要視されている。Currently, materials used for EOE include aluminum and tinplate (tin-plated steel). These materials are subjected to EOE molding after an organic coating of about 5 microns on both sides, but scoring or riveting is a very severe process, and defects occur in the thin coating applied before processing. The corrosion resistance of the material is important.
一方、アルミめっき鋼板は、耐熱性、耐食性が優れて
おり、従来から溶融めっき法によって製造されている。
従来の溶融アルミニウムめっき鋼板は、溶融アルミと基
材の鋼板中の鉄とが反応して、かなり厚い鉄−アルミニ
ウム合金層が生成しており、厳しい加工に曝された場
合、合金層よりアルミニウム皮膜が剥離するため、容器
用材料としては使用されなかった。合金層は、光学顕微
鏡程度の倍率(×500)で十分観察できる程の厚さに発
達しており、完全に基材表面を合金層で被覆してしまっ
ている。On the other hand, aluminum-plated steel sheets have excellent heat resistance and corrosion resistance, and have been conventionally manufactured by a hot-dip plating method.
In conventional hot-dip aluminized steel sheets, the hot-dip aluminum reacts with the iron in the base steel sheet to produce a considerably thick iron-aluminum alloy layer. Was not used as a container material because of the peeling. The alloy layer has developed to a thickness that can be sufficiently observed at a magnification (× 500) of the order of an optical microscope, and the base material surface is completely covered with the alloy layer.
合金層成長の抑制方法として、アルミニウムにシリコ
ンを10%程度添加する方法がある。また、溶融めっきを
行なう前に予備めっきを行ない、基材鋼板とアルミニウ
ムめっき層との間に形成される合金層量を低滅させる方
法として、例えば特開昭57−76176号公報、特開昭57−1
40864号公報、特開昭56−33463号公報、特開昭57−1146
50号公報、特開昭57−70268号公報等に記載の方法が提
案されている。As a method of suppressing alloy layer growth, there is a method of adding about 10% of silicon to aluminum. Further, as a method of performing pre-plating before hot-dip plating to reduce the amount of the alloy layer formed between the base steel sheet and the aluminum plating layer, for example, JP-A-57-76176 and JP-A- 57-1
No. 40864, JP-A-56-33463, JP-A-57-1146
No. 50, JP-A-57-70268 and the like have been proposed.
しかし、これらの方法ではいずれも合金層の低減は不
十分であり、厚さが薄くとも、完全に基材表面を合金層
にて被覆してしまっているため、加工性の良好な鋼板を
得ることは困難であり、容器用、ましてやEOE等の缶蓋
として適用された例はない。However, in any of these methods, the reduction of the alloy layer is insufficient, and even if the thickness is thin, the surface of the base material is completely covered with the alloy layer, so that a steel sheet having good workability is obtained. It is difficult to do so, and there is no example applied as a can lid for containers or even EOE.
発明が解決しようとする課題 ぶりきの場合、めっき厚が非常に薄いため、スコア加
工部あるいはリベット加工部等では、塗膜に欠陥が生じ
ると共に基材の素地が露出することが多く、高酸性飲料
を内容物とする場合、基材鋼板中の鉄溶出による味、フ
レーバーの低下を招き易い弱い欠点を有している。従っ
て、耐食性を改善するため、EOE成形後にスコア加工部
およびリベット加工部を、有機塗料により再度塗装せざ
るをえない現状にある。Problems to be Solved by the Invention In the case of tinplate, since the plating thickness is very thin, in the score-processed portion or the rivet-processed portion, the coating film often causes defects and the base material of the base material is often exposed, resulting in high acidity. When a beverage is used as a content, the beverage has a weak defect that tends to cause a decrease in taste and flavor due to iron elution in the base steel sheet. Therefore, in order to improve the corrosion resistance, the score-processed portion and the rivet-processed portion have to be painted again with the organic paint after the EOE molding.
また、ぶりきの場合、一般的に有機塗料の密着性が良
くないため、缶蓋巻き締め部内面(以下CS:Countersink
部と呼称する)においても塗膜欠陥が生じ易く、鉄溶出
による味、フレーバー問題を生じ易い傾向を有してい
る。In addition, in the case of tinplate, the adhesion of the organic paint is generally not good, so the inner surface of the can cover winding portion (hereinafter CS: Countersink)
(Referred to as “parts”), coating film defects are likely to occur, and taste and flavor problems due to iron elution tend to occur.
アルミニウムの場合、素材そのものが内容物の腐食性
を左右する有機酸に比較的強い特性を有するため、スコ
ア加工部およびリベット加工部で塗膜に欠陥が生じたと
しても、必ずしも補修塗装をする必要がない利点を有し
ている。In the case of aluminum, the material itself has a relatively strong property to the organic acid that affects the corrosiveness of the contents, so even if the coating film has defects in the score processing part and the rivet processing part, it is necessary to perform repair painting. Has no advantages.
本発明は、以上詳述した様なぶりきの欠点を解消する
ため、アルミニウムの高耐食性を利用し、補修塗装を必
要としない、耐食性の優れた缶蓋用溶融アルミニウムめ
っき鋼板を提供することを目的としてなされたものであ
る。The present invention is to provide a hot-dip aluminized steel sheet for a can lid having excellent corrosion resistance, utilizing the high corrosion resistance of aluminum and eliminating the need for repair painting, in order to eliminate the disadvantages of tinplate as described in detail above. It was made for the purpose.
また他の目的は従来のアルミニウムめっき鋼板の加工
性上の欠点を解消して、缶蓋用に適用できるアルミニウ
ムめっき鋼板を提供することにある。It is another object of the present invention to provide an aluminum-plated steel sheet which can be applied to a can lid by solving the drawbacks of the conventional aluminum-plated steel sheet in workability.
課題を解決するための手段 本発明は前記の目的を達成するために、従来のアルミ
ニウムめっき鋼板のFe−Al合金層が基材の鋼板表面を完
全に被覆している点を改良して、Fe−Al合金層を部分的
に破壊し、基材鋼板とアルミニウムめっき皮膜との間
に、Fe−Al合金層の存在部と非存在部を形成させると共
に最表層部にクロム化合物を被覆させたことに特徴があ
る。Means for Solving the Problems In order to achieve the above object, the present invention is to improve the point that the Fe-Al alloy layer of the conventional aluminum-plated steel sheet completely covers the steel sheet surface of the base material, -Partially destroyed the Al alloy layer, forming the presence and absence of the Fe-Al alloy layer between the base steel sheet and the aluminum plating film, and coating the outermost layer with a chromium compound. There is a feature.
すなわち、本発明は、基材としての薄鋼板の表面にFe
−Al合金層と、その表面にAl皮膜またはAl合金皮膜と、
さらにその表面に少くとも最表層がクロムに換算して5
〜50mg/m2のクロム化合物からなる皮膜を有する缶蓋用
溶融アルミニウムめっき鋼板であって、前記基材表面に
は前記のFe−Al合金層の存在部と非存在部が形成され、
その合金層の非存在部が基材表面の10%以上であること
を特徴とする耐食性に優れた缶蓋用溶融アルミニウムめ
っき鋼板である。That is, the present invention relates to a method of manufacturing a steel
-Al alloy layer, and on its surface Al film or Al alloy film,
In addition, at least the outermost layer on the surface is 5
A molten aluminum-plated steel sheet for a can lid having a film made of chromium compounds of to 50 mg / m 2, there portion and absence of said Fe-Al alloy layer is formed on the substrate surface,
A hot-dip aluminized steel sheet for a can lid excellent in corrosion resistance, characterized in that the non-existent portion of the alloy layer is at least 10% of the surface of the base material.
作用 以下、本発明について詳しく説明する。Operation Hereinafter, the present invention will be described in detail.
本発明の特徴の一つは、基材とめっき金属であるアル
ミニウムまたはアルミニウム合金皮膜との結合形態を変
える所にある。前述した如く、従来の溶融アルミニウム
めっき鋼板では、必ず基材鋼板の表面は全面が合金層に
覆われており、その厚みにより加工性に若干の差は存在
するが、スコア加工あるいはリベット加工等強度の加工
にさらされた場合、合金層の破壊に起因するめっき皮膜
の剥離が発生し、EOE用鋼板として使用することが出来
ない。One of the features of the present invention resides in that the bonding form between the base material and the aluminum or aluminum alloy film as the plating metal is changed. As described above, in the conventional hot-dip aluminized steel sheet, the entire surface of the base steel sheet is always covered with the alloy layer, and although there is a slight difference in workability depending on the thickness, the strength such as score processing or rivet processing is used. When it is subjected to the above-mentioned processing, peeling of the plating film occurs due to the destruction of the alloy layer, and it cannot be used as a steel sheet for EOE.
本発明は、めっき金属の加工密着性を得るため、基材
鋼板とめっき皮膜間に一定限度以上のFe−Al合金層の非
存在部を確保する。ここでいうFe−Al合金層の非存在部
とは、基材鋼板とめっき皮膜との界面に実質的に合金層
が存在しない状態を示すものであり、例えば、電気めっ
きによって金属をめっきした場合の鋼板とめっき金属と
の界面に類似したものである。The present invention secures a non-existent portion of the Fe-Al alloy layer at a certain limit or more between the base steel sheet and the plating film in order to obtain the processing adhesion of the plated metal. The non-existent portion of the Fe-Al alloy layer referred to here indicates a state in which substantially no alloy layer is present at the interface between the base steel sheet and the plating film, for example, when a metal is plated by electroplating. Is similar to the interface between the steel sheet and the plated metal.
本発明における前記の合金層の非存在部の割合は、溶
融アルミニウムめっき鋼板の断面を顕微鏡で観察して、
線状に観察される合金層部分の全長(観察視野全長)に
対する破線部(合金層が破壊されている部分)の長さの
合計も百分率をもって表す。The proportion of the non-existing portion of the alloy layer in the present invention, by observing the cross section of the hot-dip aluminum-plated steel sheet with a microscope,
The sum of the length of the broken line portion (the portion where the alloy layer is broken) with respect to the entire length of the alloy layer portion observed linearly (the entire observation visual field) is also expressed as a percentage.
本発明は、めっき層を剥離させることなく部分的に合
金層を破壊し、基材鋼板上に一定限度以上の合金層の非
存在部を持たせることにより、EOE加工にも耐えうる溶
融アルミめっき鋼板を見出したものである。めっき層を
剥離させることなく合金層を破壊するためには冷間圧延
法が最適であるが、余り強度の加工を行なうと基材の機
械的性質を劣化させ、鋼板そのものの加工性に問題を生
じる。めっき皮膜の密着性は、冷間圧延の圧下率が大き
くなるとともに向上するが、基材の機械的性質は劣化す
るため適度の圧下率が設定されなければならない。冷間
圧延のかけ方としては、多パス圧延を行なう場合、前段
にて高圧下率を採用するほうが良好な密着性を得ること
が出来る。The present invention is a hot-dip aluminum plating that can withstand EOE processing by partially destroying the alloy layer without peeling the plating layer and having a non-existent part of the alloy layer over a certain limit on the base steel sheet I found a steel plate. The cold rolling method is most suitable for destroying the alloy layer without peeling off the plating layer.However, processing with excessive strength degrades the mechanical properties of the base material and poses a problem in the workability of the steel sheet itself. Occurs. The adhesion of the plating film is improved as the rolling reduction of the cold rolling is increased, but the mechanical properties of the base material are deteriorated, so that an appropriate rolling reduction must be set. As a method of applying cold rolling, when performing multi-pass rolling, it is possible to obtain better adhesion by adopting a high-pressure reduction in the preceding stage.
全圧下率としては、5%〜50%、更に望ましくは10〜
30%の圧下率により、密着性を向上するために必要な10
%以上の鉄〜アルミニウム合金層の非存在部を生成させ
ると共に、基材の機械的性質を確保することが必要であ
る。The total reduction is 5% to 50%, and more preferably 10% to 50%.
The 30% rolling reduction is necessary to improve adhesion.
% Or more of the iron-aluminum alloy layer must be generated and the mechanical properties of the base material must be ensured.
合金層を存在させる部分の合金層厚みとしては、出来
るだけ薄いことが望ましく、3.0ミクロン以下、出来れ
ば1.5ミクロン以下にすることが肝要である。The thickness of the alloy layer where the alloy layer is present is desirably as thin as possible, and it is important that the thickness be 3.0 microns or less, and preferably 1.5 microns or less.
このような方法により、加工密着性に優れた溶融アル
ミニウムめっき鋼板を得ることが出来るが、缶蓋用とし
てほそれだけでは性能的に不十分であり、アルミニウム
表面は有機塗膜により被覆されなければならない。その
際、有機塗膜の加工密着性および塗装耐食性は極めて重
要な要因であり、少くとも最表層にクロム化合物皮膜の
存在が必要である。By such a method, it is possible to obtain a hot-dip aluminized steel sheet having excellent work adhesion, but it is not sufficient in performance alone for a can lid, and the aluminum surface must be coated with an organic coating film. . At that time, the processing adhesion and coating corrosion resistance of the organic coating film are extremely important factors, and at least the presence of a chromium compound film on the outermost layer is necessary.
本発明者らの知見した所によれば、少くとも最表層に
クロム化合物を有する皮膜を形成する例としては、若干
の陰イオンを含んだクロム酸溶液中にて陰極電解処理を
行なうことにより、金属クロムと水和酸化クロム皮膜の
2層構造を有する皮膜を電解で形成させる方法、あるい
は重クロム酸化合物溶液中にて陰極電解処理を行なうこ
とにより、水和酸化クロムを主体とする皮膜を電解で形
成させる方法等が有効であった。According to the findings of the present inventors, as an example of forming a film having a chromium compound on at least the outermost layer, by performing cathodic electrolytic treatment in a chromic acid solution containing some anions, Electrolytic formation of a film having a two-layer structure of metallic chromium and hydrated chromium oxide film, or by performing cathodic electrolysis treatment in a dichromate compound solution to electrolyze a film mainly composed of hydrated chromium oxide Was effective.
この際、クロム皮膜量として、クロムに換算して、5m
g/m2未満では有機塗膜の加工密着性および塗装耐食性に
対する効果が弱く、50mg/m2超では有効性が飽和すると
共にクロム皮膜による着色が起こり好ましくない。At this time, the amount of chromium film
If it is less than g / m 2 , the effect on the processing adhesion and coating corrosion resistance of the organic coating film is weak, and if it is more than 50 mg / m 2 , the effectiveness is saturated and coloring by the chromium film occurs, which is not preferable.
特に望ましいクロム皮膜量としては、15〜30mg/m2で
ある。A particularly desirable chromium coating amount is 15 to 30 mg / m 2 .
クロム皮膜の形成法としては、電解法に限定するもの
ではなく、化学反応により形成されるクロム化合物皮膜
にても十分な性能を得ることが出来る。例えば、クロム
酸、リン酸およびフッ酸を主成分とする処理液中にて、
リン酸クロム皮膜を5〜50mg/m2形成させる事により、
極めて優れた有機塗膜の加工密着性および塗装耐食性を
得る事が出来る。The method of forming the chromium film is not limited to the electrolytic method, and sufficient performance can be obtained even with a chromium compound film formed by a chemical reaction. For example, in a processing solution containing chromic acid, phosphoric acid and hydrofluoric acid as main components,
By causing the phosphate chrome surface 5 to 50 mg / m 2 formed,
Extremely good processing adhesion and coating corrosion resistance of the organic coating film can be obtained.
なお、本発明でいうアルミニウム合金とは、シリコ
ン、マンガン、マグネシウム、鉄等をアルミニウムに配
合して合金化させたものをいう。The aluminum alloy in the present invention refers to an alloy obtained by mixing silicon, manganese, magnesium, iron, or the like with aluminum and alloying it.
本発明は溶融アルミニウムまたは溶融アルミニウム合
金めっき鋼板をベースとして、基材鋼板上に鉄−アルミ
ニウム合金層が存在しない部分を一定以上有するのでめ
っき密着性がすぐれ、また表面に有機塗膜を施し、その
後にスコア方式のEOEを製造すれば極めて優れた有機塗
膜の加工密着性および塗装耐食性を得る事が出来ること
より、成形後に耐食性を保持するための補修塗装を行な
わずとも十分な耐食性を得ることが出来る。The present invention is based on a hot-dip aluminum or hot-dip aluminum alloy-plated steel sheet, and has a certain or more portion where the iron-aluminum alloy layer is not present on the base steel sheet, so that the plating adhesion is excellent, and the surface is coated with an organic coating film. By producing a score type EOE, it is possible to obtain extremely excellent processing adhesion and coating corrosion resistance of the organic coating film, so that sufficient corrosion resistance can be obtained without performing repair coating to maintain corrosion resistance after molding. Can be done.
このような効果は他の用途、例えば一般の製蓋用とし
ても良好な耐食性を期待することが出来る。With such an effect, good corrosion resistance can be expected for other uses, for example, for general lid production.
実施例1 板厚0.25mmの薄鋼板の両面に表裏合計30μmのアルミ
ニウム(10%シリコン含有)めっきを行なった。めっき
後、冷間圧延により0.22mmにまで圧延し基材鋼板の表面
に合金層の存在しない割合が15%の溶融アルミニウムめ
っき鋼板を得た。この鋼板を、クロム酸、リン酸および
フッ酸を主成分とする化成処理液中に浸漬し、25mg/m2
のリン酸クロム被膜を得た。Example 1 Both sides of a thin steel plate having a thickness of 0.25 mm were plated with aluminum (containing 10% silicon) having a total of 30 μm on both sides. After the plating, the steel sheet was rolled to 0.22 mm by cold rolling to obtain a hot-dip aluminum-plated steel sheet having a 15% alloy free layer on the surface of the base steel sheet. This steel sheet was immersed in a chemical conversion treatment solution containing chromic acid, phosphoric acid, and hydrofluoric acid as main components, and was subjected to 25 mg / m 2
Of chromium phosphate was obtained.
この鋼板の片面にエポキシフェノール系の塗料を5μ
m、もう片面にビニル系の塗料を5μm塗布したのち、
EOEの成形を行なった。5μ of epoxyphenol paint is applied on one side of this steel plate.
m, after applying 5 μm of vinyl paint on the other side,
EOE molding was performed.
EOEの成形はスコア方式のものとし、スコア部のスチ
ール残厚が65μmになるようにビニル系の塗料面を缶外
面になるよう成形した。成形したEOEのスコア部内面側
の塗膜を剥離後、めっき面を詳細に調査した所、基材表
面が露出したところは皆無であった。基材表面の露出程
度は、X線マイクロアナライザーにより、表面に鉄が検
出されるかどうかにより判定したものである。また、リ
ベット加工部におけるアルミニウム皮膜の密着性は極め
て優れたものであり、皮膜剥離は皆無であった。The EOE was formed by a score method, and the vinyl-based paint surface was formed so as to be the outer surface of the can so that the steel thickness of the score portion was 65 μm. After peeling off the coating film on the inner surface of the score portion of the formed EOE, the plating surface was examined in detail, and there was no place where the substrate surface was exposed. The degree of exposure of the substrate surface was determined based on whether or not iron was detected on the surface by an X-ray microanalyzer. Further, the adhesion of the aluminum film in the rivet processing portion was extremely excellent, and there was no peeling of the film.
実施例2 板厚0.30mmの薄鋼板の両面に表裏合計50μmのアルミ
ニウム(10%シリコン含有)めっきを行なった。めっき
後、冷間圧延により0.24mmにまで圧延し基材鋼板の表面
に合金層の存在しない割合が40%の溶融アルミニウムめ
っき鋼板を得た。この鋼板を、重クロム酸ソーダを主体
とする溶液中にて陰極電解し、8mg/m2の水和酸化クロム
皮膜を得た。Example 2 Both sides of a 0.30 mm-thick thin steel plate were plated with aluminum (containing 10% silicon) having a total of 50 μm on both sides. After the plating, the steel sheet was rolled to 0.24 mm by cold rolling to obtain a hot-dip aluminum-plated steel sheet having a ratio of 40% without an alloy layer on the surface of the base steel sheet. This steel sheet was subjected to cathodic electrolysis in a solution mainly containing sodium bichromate to obtain an 8 mg / m 2 hydrated chromium oxide film.
この鋼板の片面にエポキシフェノール系、もう片方の
面にビニル系の塗料を塗装し、エポキシフェノール系塗
料面を缶内面として製蓋加工に供した。One surface of this steel plate was coated with an epoxy phenol-based paint, and the other surface was coated with a vinyl-based paint.
製蓋加工後、内面のエポキシフェノール系塗料を溶剤
剥離し、アルミニウム皮膜の密着性および均一性を調べ
た所、皮膜剥離は全くなく、基材表面の露出も皆無であ
った。After the lid-forming process, the epoxyphenol-based paint on the inner surface was solvent-peeled, and the adhesion and uniformity of the aluminum film were examined. As a result, there was no film peeling and no exposure of the substrate surface.
比較例1 板厚0.18mmの薄鋼板の両面に表裏合計40μmのアルミ
ニウム(10%シリコン含有)めっきを行なった。このめ
っき鋼板での基材〜アルミニウム皮膜間には約3μmの
厚さの合金層が基材表面の全面に存在し、合金層の非存
在部は0%であった。Comparative Example 1 Both sides of a 0.18 mm-thick thin steel plate were plated with aluminum (containing 10% silicon) having a total of 40 μm on both sides. An alloy layer having a thickness of about 3 μm was present on the entire surface of the base material between the base material and the aluminum film in the plated steel sheet, and the non-existent portion of the alloy layer was 0%.
この鋼板表面をクロメート処理および実施例1と同様
の塗装後、スコア方式のEOE成形を行なった所、リベッ
ト部においてアルミニウムの剥離が起こり、実用的性能
のないものであつた。After the surface of this steel sheet was subjected to chromate treatment and coating in the same manner as in Example 1, score-type EOE molding was performed. As a result, aluminum was peeled off at the rivet portion, and the steel sheet had no practical performance.
発明の効果 以上説明したとおり、本発明のめっき鋼板は加工性、
密着性、耐食性に優れたもので缶蓋用として有用なもの
である。Effect of the Invention As described above, the plated steel sheet of the present invention has workability,
It has excellent adhesion and corrosion resistance and is useful for can lids.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平1−298142(JP,A) 特開 昭58−224159(JP,A) 特開 昭57−126960(JP,A) 実開 昭58−83457(JP,U) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-298142 (JP, A) JP-A-58-224159 (JP, A) JP-A-57-126960 (JP, A) 83457 (JP, U)
Claims (1)
ウム合金層と、その表面にアルミニウム皮膜またはアル
ミニウム合金皮膜と、さらにその表面に少くとも最表層
がクロムに換算して5〜50mg/m2のクロム化合物からな
る皮膜を有する缶蓋用溶融アルミニウムめっき鋼板であ
って、前記基材表面には前記の鉄−アルミニウム合金層
の存在部と非存在部が形成され、その合金層の非存在部
が基材表面の10%以上であることを特徴とする耐食性に
優れた缶蓋用溶融アルミニウムめっき鋼板。An iron-aluminum alloy layer on the surface of a thin steel sheet as a substrate, an aluminum film or an aluminum alloy film on the surface, and at least the outermost layer on the surface has a chromium equivalent of 5 to 50 mg / mm. a molten aluminum-plated steel sheet for a can lid having a film made of chromium compounds of m 2, wherein the iron to the substrate surface - the presence portions and absence of the aluminum alloy layer is formed, non of the alloy layer Hot-dip aluminized steel sheet for can lids with excellent corrosion resistance, characterized in that the existing part is at least 10% of the surface of the base material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12819888A JP2625498B2 (en) | 1988-05-27 | 1988-05-27 | Hot-dip aluminized steel sheet for can lid with excellent corrosion resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12819888A JP2625498B2 (en) | 1988-05-27 | 1988-05-27 | Hot-dip aluminized steel sheet for can lid with excellent corrosion resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01298141A JPH01298141A (en) | 1989-12-01 |
JP2625498B2 true JP2625498B2 (en) | 1997-07-02 |
Family
ID=14978887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12819888A Expired - Lifetime JP2625498B2 (en) | 1988-05-27 | 1988-05-27 | Hot-dip aluminized steel sheet for can lid with excellent corrosion resistance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2625498B2 (en) |
-
1988
- 1988-05-27 JP JP12819888A patent/JP2625498B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01298141A (en) | 1989-12-01 |
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