JP4256721B2 - Method for producing silver metallic design-plated steel sheet - Google Patents
Method for producing silver metallic design-plated steel sheet Download PDFInfo
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- JP4256721B2 JP4256721B2 JP2003143686A JP2003143686A JP4256721B2 JP 4256721 B2 JP4256721 B2 JP 4256721B2 JP 2003143686 A JP2003143686 A JP 2003143686A JP 2003143686 A JP2003143686 A JP 2003143686A JP 4256721 B2 JP4256721 B2 JP 4256721B2
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- steel sheet
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Description
【０００１】
【発明の属する技術分野】
本発明は、家電製品の筐体、家電部品等に適する、意匠性に優れたシルバーメタリック調のめっき鋼板の製造方法に関するものである。
【０００２】
【従来の技術】
従来より、食洗機あるいは炊飯器などの家電用途には、ステンレスあるいは後めっきのＣｒめっき鋼板等がメタリック調の意匠性に優れることから、広く使用されている。
【０００３】
【発明が解決しようとする課題】
最近、特にこれらのステンレスや後めっきのＣｒめっき鋼板のようなシルバーメタリック調の外観を有しており、低コストの鋼板でしかも疵がついても赤錆が発生しにくい犠牲防食効果の有るプレめっき鋼板が望まれていた。
本発明の目的は、上記のニーズである、意匠性と犠牲防食効果のある鋼板の製造方法を提供することにある。
【０００４】
【課題を解決するための手段】
本発明者らは、上記課題を解決するために種々検討した結果、付着量３ｇ/m2 以上有する電気Ｚｎめっき鋼板のめっき層表面の光沢度がＧ値で２００以上、表面粗さがＲａで０．２５μｍ以下である場合に、意匠性と疵部の耐赤錆性に優れた犠牲防食効果のあるめっき鋼板が得られることを見出した。また、そのめっき層の上にクリヤーあるいはシルバーメタリック調の有機系後処理皮膜、有機塗装あるいはラミネート皮膜を処理することにより、平面部及び疵部の耐食性がさらに高まることも見出した。
【０００５】
めっき層の表面粗さの調整方法としては、付着量３ｇ/m２ 以上有する電気Ｚｎめっき鋼板に有機系後処理皮膜、有機塗装あるいはラミネート皮膜から選ばれた皮膜を施した後、１．０％以上のスキンパス圧延をすることにより、本発明鋼板が得られることがわかった。
さらには、めっき原板の粗度Ｒａを０．１μｍ以下にコントロールすることにより、さらに優れたシルバーメタリック調の意匠性が得られることも見出した。
本発明は、これらの新知見を基に完成した。
【０００６】
すなわち、本発明の要旨は以下の構成からなる。
（１）付着量３ｇ/m２ 以上の電気Ｚｎめっき層を有する鋼板に、有機系後処理皮膜、有機塗装あるいはラミネート皮膜から選ばれた皮膜を施した後、１．０％以上のスキンパス圧延をすることを特徴とするシルバーメタリック調めっき鋼板の製造方法。
（２）上記記載の製造方法において、使用するめっき原板の表面粗度Ｒａが０．１μｍ以下であることを特徴とする前記（１）に記載のシルバーメタリック調めっき鋼板の製造方法。
【０００７】
【発明の実施の形態】
本発明者らは電気Ｚｎめっき鋼板の表面粗度の異なるサンプルを作成し、検討した結果、付着量３ｇ/m2 以上有する電気Ｚｎめっき層表面の光沢度がＧ値で２００以上、表面粗さがＲａで０．２５μｍ以下である場合に、目的とするシルバーメタリック調めっき鋼板が得られることを見出した。
めっき層表面のＧ値が２００未満、表面粗さＲａが０．２５μｍ超である場合には、シルバーメタリック調の外観が不充分である。
【０００８】
Ｇ値の上限については特に限定しなくてもよいが、５００以下で十分である。
表面粗さＲａの下限は低いほどよい。
電気Ｚｎめっき層の付着量を３ｇ/m2 以上としたのは、耐食性（平面部及び疵部の耐赤錆性）が良好となるためである。付着量の上限は特に限定しないが、加工性などの点から１５０ｇ/m2 までが好ましい。
【０００９】
本発明のポイントとして、下地のめっき層表面の有する光沢、表面粗度を活かしてメタリック調の外観を得ることが最大の特徴であり、めっき層の上にクリヤーの有機系後処理皮膜、有機塗装あるいはラミネート皮膜から選ばれた皮膜を有することとしたのは、めっき層表面のメタリック調はそのまま活かしつつ、耐食性（平面部及び疵部の耐赤錆性）がさらに向上するためである。
【００１０】
また、めっき層の上にシルバーメタリック調の有機系後処理皮膜、有機塗装あるいはラミネート皮膜から選ばれた皮膜を有することとしたのは、めっき層のメタリック調を活かしつつ、メタリック調をこれらの皮膜で補うことにより意匠性がさらに向上し、耐食性（平面部及び疵部の耐赤錆性）もさらに向上するためである。
【００１１】
さらには、付着量３ｇ/m2 以上有する電気Ｚｎめっき鋼板に１．０％以上のスキンパス圧延を施すことを特徴とするシルバーメタリック調めっき鋼板の製造方法としたのは、スキンパス率１．０％以上でめっき層表面光沢が良好となり、シルバーメタリック調を有するようになるからである。
【００１２】
さらに、付着量３ｇ/m2 以上有する電気Ｚｎめっき鋼板に、クリヤーあるいはシルバーメタリック調の有機系後処理皮膜、有機皮膜あるいはラミネート皮膜を施した後、１．０％以上のスキンパス圧延をすることとしたのは、スキンパス圧下率１．０％以上でやはりめっき層表面光沢が良好となり、シルバーメタリック調を有するようになるからである。
スキンパス圧下率の上限については特に限定しないが、１０％以下にするのが好ましい。
【００１３】
さらにはこれらの製造方法において、電気めっき鋼板の原板の表面粗度Ｒａが０．１μｍ以下であることとしたのは、この範囲の表面粗度でシルバーメタリック調がさらに優れためっき鋼板が得られるためである。粗度は低いほどよい。
【００１４】
有機系後処理皮膜の有機成分および添加剤の種類は特に限定しないが、通常のアクリル、エポキシ、ウレタン系樹脂、シリカなどを主成分としたクリヤーの有機系クロメートフリー皮膜が使用できる。また、有機塗装の有機成分は通常のアクリル、エポキシ、ウレタン系樹脂が使用できる。
上記皮膜の厚みも特に限定しないが、耐食性及びコストを考慮すると１〜５μｍ程度が望ましい。ラミネート皮膜としては、ＰＥＴ（ポリエチレンテレフタレート）、ＰＰ（ポリプロピレン）樹脂系などを使用できる。
【００１５】
製造設備には特にとらわれないが、電気亜鉛めっきラインの後処理ラインで製造するのが望ましい。電気亜鉛めっき浴としては、通常の硫酸亜鉛を含んだ酸性浴が使用できる。また、デキストリンなどの光沢材添加材を入れた浴を使用すると、光沢度が増加し、メタリック意匠性への効果が助長される。
【００１６】
めっき原板は鋼種の制約もなく、例えばＡｌキルド鋼、Ｔｉ等の炭窒化物形成元素を添加した極低炭素鋼板、およびこれに強化元素（Ｐ，Ｓｉ，Ｍｎ等）を添加した高強度鋼など種々の鋼板が使用できる。
【００１７】
【実施例】
以下、実施例によって本発明をさらに詳細に説明する。
表１に示すようなめっき鋼板を作成し、意匠性（目視）、光沢度、表面粗度および耐食性を調査した。評価基準は次の通りである。結果を表１に併せて示す。
【００１８】
１) シルバーメタリック意匠性：
評点５：シルバー調極めて良好。光沢度Ｇ値：３００以上、
表面粗さＲａ：０．２μｍ以下
４：良好。光沢度Ｇ値：２００以上３００未満、
表面粗さＲａ：０．２超０．２５μｍ以下
３：普通。光沢度Ｇ値：１００以上２００未満、
表面粗さＲａ：０．２５超０．３μｍ以下
２：やや劣化。光沢度Ｇ値：８０以上１００未満、
表面粗さＲａ：０．３超０．４μｍ以下
１：劣化（通常Ｚｎめっき並）：光沢度Ｇ値：８０未満、
表面粗さＲａ：０．４μｍ超
【００１９】
２）耐食性（評価３点以上が合格） ＳＳＴ７２ｈｒ
表１に示す通り、本発明の製造方法で作成した本発明鋼板（ No.２，３，５，７〜９）は、シルバーメタリック意匠性が良好で、かつ耐食性（平面部及び疵つき部の耐赤錆性）が良好である。それに比較して、本発明範囲を逸脱する場合（ No.１０〜１１）は、外観あるいは耐食性が不良である。
なお、ステンレスや、後めっきのＣｒめっきは光沢度Ｇ値で３００超であり、本発明の No.８，９等は、光沢度Ｇ値も近い値を示し、優れた意匠性が得られた。
【００２１】
【表１】
【発明の効果】
本発明の製造方法によるめっき鋼板は、表面外観がシルバーメタリック調で耐食性にも優れ、家電用途等に有効である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a silver-metallic-plated steel sheet excellent in design, which is suitable for housings of home appliances, home appliance parts, and the like.
[0002]
[Prior art]
Conventionally, stainless steel or post-plated Cr-plated steel sheets have been widely used for household appliances such as dishwashers or rice cookers because of their excellent metallic design.
[0003]
[Problems to be solved by the invention]
Recently, pre-plated steel sheets that have a silver metallic appearance, especially these stainless steels and post-plated Cr-plated steel sheets, are low-cost steel sheets and have a sacrificial anti-corrosion effect that does not cause red rust even if they are wrinkled. It was desired.
The objective of this invention is providing the manufacturing method of the steel plate which has the design nature and sacrificial anticorrosive effect which are said needs.
[0004]
[Means for Solving the Problems]
As a result of various studies to solve the above problems, the inventors of the present invention have a G-value of 200 or more in terms of gloss on the surface of the electroplated steel sheet having an adhesion amount of 3 g / m 2 or more and a surface roughness of Ra. It has been found that when the thickness is 0.25 μm or less, a plated steel sheet having a sacrificial anticorrosive effect excellent in design properties and red rust resistance of the buttocks can be obtained. Further, it has also been found that the corrosion resistance of the flat portion and the heel portion is further improved by treating the plating layer with a clear or silver metallic-like organic post-treatment film, organic coating or laminate film.
[0005]
As a method for adjusting the surface roughness of the plating layer , the adhesion amount is 3 g / m 2. It is understood that the steel sheet of the present invention can be obtained by applying a film selected from an organic post-treatment film , an organic coating or a laminate film to the electroplated Zn-plated steel sheet having the above, and then performing skin pass rolling of 1.0% or more. It was.
Furthermore, it has also been found that by controlling the roughness Ra of the plating original plate to 0.1 μm or less, a further excellent silver metallic design can be obtained.
The present invention has been completed based on these new findings.
[0006]
That is, the gist of the present invention has the following configuration.
( 1 ) Adhesion amount 3g / m 2 Silver metallic plating characterized by applying a film selected from an organic post-treatment film, an organic coating or a laminate film to a steel sheet having the above-described electric Zn plating layer, followed by skin pass rolling of 1.0% or more A method of manufacturing a steel sheet .
( 2 ) In the manufacturing method described above, the surface roughness Ra of the plating base plate to be used is 0.1 μm or less. The method for manufacturing a silver metallic-tone plated steel plate according to (1) above.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
As a result of preparing and examining samples having different surface roughnesses of the electric Zn-plated steel sheet, the present inventors have found that the surface of the Zn-plated layer having an adhesion amount of 3 g / m 2 or more has a gloss value of 200 or more in terms of G value. It was found that the target silver metallic tone plated steel sheet can be obtained when Ra is 0.25 μm or less .
When the G value on the surface of the plating layer is less than 200 and the surface roughness Ra is more than 0.25 μm, the appearance of silver metallic tone is insufficient.
[0008]
The upper limit of the G value is not particularly limited, but 500 or less is sufficient.
The lower the lower limit of the surface roughness Ra, the better.
The reason why the adhesion amount of the electric Zn plating layer is set to 3 g / m 2 or more is that the corrosion resistance (red rust resistance of the flat surface portion and the flange portion) becomes good. The upper limit of the adhesion amount is not particularly limited, but is preferably up to 150 g / m 2 from the viewpoint of workability.
[0009]
The most important feature of the present invention is that a metallic appearance is obtained by taking advantage of the gloss and surface roughness of the underlying plating layer surface, and a clear organic post-treatment film or organic coating is applied on the plating layer. Or it has decided to have the film | membrane chosen from the laminate film | membrane because corrosion resistance (red rust resistance of a plane part and a collar part) improves further, utilizing the metallic tone of the plating layer surface as it is.
[0010]
In addition, it was decided to have a silver metallic-like organic post-treatment coating, organic coating or laminate coating on the plating layer, while taking advantage of the metallic tone of the plating layer, This is because the design properties are further improved by supplementing, and the corrosion resistance (red rust resistance of the flat surface portion and the collar portion) is further improved.
[0011]
Further, the adhesion amount had a manufacturing method of the silver metallic tone plated steel sheet, characterized in that the electrical Zn plated steel sheet having 3 g / m 2 or more is subjected to skin pass rolling of 1.0%, the skin pass of 1.0% or more This is because the surface gloss of the plating layer becomes good and has a silver metallic tone.
[0012]
Furthermore, after applying a clear or silver metallic-like organic post-treatment film, organic film or laminate film to an electroplated Zn-plated steel sheet having an adhesion amount of 3 g / m 2 or more, a skin pass rolling of 1.0 % or more is performed. This is because, when the skin pass reduction ratio is 1.0 % or more, the surface gloss of the plating layer is also good and has a silver metallic tone.
The upper limit of the skin pass reduction ratio is not particularly limited, but is preferably 10% or less.
[0013]
Furthermore, in these manufacturing methods, the surface roughness Ra of the original plate of the electroplated steel plate is 0.1 μm or less because a plated steel plate having a surface roughness in this range and a more excellent silver metallic tone is obtained. It is. The lower the roughness, the better.
[0014]
The organic components and additives of the organic post-treatment film are not particularly limited, and a clear organic chromate-free film mainly composed of a normal acrylic, epoxy, urethane resin, silica or the like can be used. The organic component of the organic coating can be a normal acrylic, epoxy, or urethane resin.
The thickness of the film is not particularly limited, but is preferably about 1 to 5 μm in consideration of corrosion resistance and cost. As the laminate film, PET (polyethylene terephthalate), PP (polypropylene) resin, or the like can be used.
[0015]
Although it is not particularly limited by the production facility, it is desirable to produce it on the post-treatment line of the electrogalvanizing line. As the electrogalvanizing bath, an ordinary acidic bath containing zinc sulfate can be used. In addition, when a bath containing a glossy additive such as dextrin is used, the glossiness is increased and the effect on the metallic design is promoted.
[0016]
There are no restrictions on the type of steel used for plating. For example, Al killed steel, ultra-low carbon steel sheet to which carbonitride- forming elements such as Ti are added, and high strength steel to which reinforcing elements (P, Si, Mn, etc.) are added. Various steel plates can be used.
[0017]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
Plated steel sheets as shown in Table 1 were prepared and examined for designability (visual observation), glossiness, surface roughness, and corrosion resistance. The evaluation criteria are as follows. The results are also shown in Table 1.
[0018]
1) Silver metallic design:
Score 5 : Silver tone is extremely good. Gloss level G value: 300 or more,
Surface roughness Ra: 0.2 μm or less 4: Good. Glossiness G value: 200 or more and less than 300,
Surface roughness Ra: more than 0.2 and 0.25 μm or less 3: Normal. Glossiness G value: 100 or more and less than 200,
Surface roughness Ra: more than 0.25 and not more than 0.3 μm 2: slightly deteriorated. Glossiness G value: 80 or more and less than 100,
Surface roughness Ra: More than 0.3 and 0.4 μm or less 1: Deterioration (usually equivalent to Zn plating): Gloss value G: less than 80
Surface roughness Ra: more than 0.4 μm
2) Corrosion resistance (Evaluation is 3 points or higher) SST72hr
As shown in Table 1, the steel plates of the present invention (Nos. 2, 3, 5, 7 to 9) prepared by the production method of the present invention have good silver metallic design properties and corrosion resistance (resistance to flat and wrinkled portions). Good red rust). On the other hand, when deviating from the scope of the present invention (No. 10 to 11), the appearance or corrosion resistance is poor.
In addition, stainless steel and post-plated Cr plating have a gloss value G of more than 300, and Nos. 8 and 9 of the present invention show similar values of gloss value G, and excellent design properties were obtained. .
[0021]
[Table 1]
【The invention's effect】
The plated steel sheet produced by the production method of the present invention has a silver metallic appearance and excellent corrosion resistance, and is effective for home appliances and the like.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003143686A JP4256721B2 (en) | 2003-05-21 | 2003-05-21 | Method for producing silver metallic design-plated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003143686A JP4256721B2 (en) | 2003-05-21 | 2003-05-21 | Method for producing silver metallic design-plated steel sheet |
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| Publication Number | Publication Date |
|---|---|
| JP2004346363A JP2004346363A (en) | 2004-12-09 |
| JP4256721B2 true JP4256721B2 (en) | 2009-04-22 |
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| JP2003143686A Expired - Fee Related JP4256721B2 (en) | 2003-05-21 | 2003-05-21 | Method for producing silver metallic design-plated steel sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007043102A1 (en) * | 2005-09-30 | 2007-04-19 | Mitsubishi Denki Kabushiki Kaisha | Electrode for discharge surface treatment, discharge surface treatment method, and film |
| KR20170045394A (en) * | 2010-08-30 | 2017-04-26 | 에이케이 스틸 프로퍼티즈 인코포레이티드 | Galvanized carbon steel with stainless steel-like finish |
| DE102013100730B3 (en) * | 2013-01-25 | 2014-06-05 | Thyssenkrupp Rasselstein Gmbh | Method and apparatus for producing galvanized fine or fine sheet with high corrosion resistance and use of galvanized fine or Feinstblechs |
| CN114108043B (en) * | 2021-11-19 | 2023-08-11 | 山东省路桥集团有限公司 | Repairing and regenerating pretreatment method for rusted area of steel structure bridge |
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