JPS6340865B2 - - Google Patents
Info
- Publication number
- JPS6340865B2 JPS6340865B2 JP14936584A JP14936584A JPS6340865B2 JP S6340865 B2 JPS6340865 B2 JP S6340865B2 JP 14936584 A JP14936584 A JP 14936584A JP 14936584 A JP14936584 A JP 14936584A JP S6340865 B2 JPS6340865 B2 JP S6340865B2
- Authority
- JP
- Japan
- Prior art keywords
- plating layer
- steel plate
- steel sheet
- blackened
- microcracks
- 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
Links
Landscapes
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- ing And Chemical Polishing (AREA)
Description
（産業上の利用分野）
本発明は、事務用品、光学機器、電気製品、自
動車部品等の分野で、最近、裸使用の用途を開拓
しつつある黒色化鋼板に関する。
（従来技術とその問題点）
従来のメツキ鋼板は、外観が白色、あるいは灰
白色であり、高級感に欠けるので、裸使用を目的
とした用途にはあり適さない。
そこで最近、表面を黒色化した鋼板が開発さ
れ、裸使用でも外観的に十分高級感を有するた
め、事務用品、カメラ等の光学機器、オーデイオ
等の電気製品、自動車部品等の広い分野で使用さ
れてきた。即ち、公知の鋼板黒色化法としては、
下記のような方法があげられる。
(イ) カーボンブラツク等を主成分とした黒色樹脂
皮膜を、鋼板もしくはメツキ鋼板表面に形成す
る方法（特開昭56−62996）。
(ロ) 鋼板表面にAgを含む皮膜を形成する方法。
(ハ) 鋼板を、タンニン鉄水溶液に無機物の硝酸塩
を添加した処理液で処理する方法（特開昭56−
62968）。
(ニ) Co及び添加剤を含むZnメツキ鋼板を陽極処
理する方法（特開昭58−151490、特開昭58−
151491）。
しかし、これら公知の方法には、(1)銀等の貴金
属を使用するので、コスト的に不利である、(2)カ
ーボンブラツク等を主成分とする皮膜は密着性が
劣る、(3)処理方法及び設備が複雑である、等の問
題点がある。
本発明は、上述のような問題点を改善したもの
で、密着性等に優れた黒色化鋼板を提供するもの
である。
（発明の構成）
Zn−Ni系合金化メツキは、メツキ層中の残留
歪により、エツチングや応力でメツキ層に容易に
クラツクを生じる事は知られている。本発明者ら
は、この性質を利用してメツキ層表面に極微細な
クラツクを均一に生成させると美麗な黒色を呈す
ることを見出し、本発明をなしたものである。
即ち、本発明の骨子は、最上層にZn−Ni系合
金化メツキ層を有する鋼板において、該メツキ層
の表面全体にわたつて、方向性を有しないマイク
ロクロツクを均一に生成させた点にある。
第１図のイ及びロは、本発明の黒色化鋼板の皮
膜構造例で、イはマイクロクラツクが深い場合
を、ロは浅い場合を示す。鋼板１に施したZn−
Ni系合金化メツキ層２は、その表面全体にわた
つて、均一なマイクロクラツク３を有している。
第２図は、本鋼板のマイクロクラツクの分布を示
す顕微鏡表面SEM写真である。
本発明において、クラツクを生成させる方法と
しては、エツチングや応力等の公知の手段が使用
でき、特に限定されないが、生成させるべきクラ
ツクは、幅が0.5μ以下、長さ10μ以下が望ましい。
但し、クラツクは枝分れしているのが一般的であ
り、ここで長さとは、クラツクの分岐点間のクラ
ツクに沿つた長さを言うものである。これよりク
ラツクの大きさが大きくなると、即ち幅が0.5μ、
長さが10μをこえると、表面での光の吸収が逆に
損なわれるため、美麗な黒色化が得られない。
また、クラツクの密度は、面積分率にして、10
％〜50％にあるのが望ましい。これ以外の範囲で
は、表面粗度の関係から、光の吸収が損なわれる
ため、黒色化が十分でない。さらに、クラツク
は、表面全体に均一に、方向性を持たない様に分
布している必要がある。クラツク以外のメツキ表
面は、出来るだけ平滑である方が望ましい。表面
が平滑でないと、この部分での光の乱反射によ
り、やはり黒色化が損なわれる。
本発明の黒色化鋼板は、そのままでも良いが、
普通さらにその上に、クロメート皮膜又は樹脂皮
膜、あるいはこれら両方を形成させて使用する。
黒色化したあとに、クロメート皮膜又は樹脂皮
膜、あるいはこれら両方を形成するのは、これに
より表面に光沢を持たせるとともに、干渉色を調
整することが出来るからであり、この処理により
深味のある美麗な黒色皮膜を得ることができる。
樹脂皮膜としては、アクリル樹脂、エポキシ樹
脂、フエノール樹脂、メラミン樹脂、フツ素樹脂
等を用途に多じて選択使用する。皮膜圧は3μ以
下が適当である。
次に本発明を実施例によつて説明する。
実施例 １
Ni13％、Zn87％、メツキ付着量20ｇ／m2のZn
−Ni合金化電気メツキ鋼板を、20℃、５％
HNO3で、処理時間を変えてエツチング処理し
た。処理時間（秒）とメツキ層に発生したマイク
ロクラツクの密度、得られた黒色化状況の結果
を、一括して表に示す。尚、マイクロクラツク
は、幅0.5μ以下、長さ10μ以下で、方向性をもた
ず、メツキ層に均一に分布していた。
(Field of Industrial Application) The present invention relates to a blackened steel sheet, which has recently been developed for use in bare steel in the fields of office supplies, optical equipment, electrical products, automobile parts, and the like. (Prior art and its problems) Conventional galvanized steel sheets have a white or grayish-white appearance and lack a sense of luxury, and are therefore not suitable for use intended for naked use. Recently, a steel plate with a blackened surface has been developed, and because it has a sufficiently luxurious appearance even when used bare, it is used in a wide range of fields such as office supplies, optical equipment such as cameras, electrical products such as audio equipment, and automobile parts. It's here. That is, the known steel plate blackening method is as follows:
The following methods are available. (a) A method of forming a black resin film mainly composed of carbon black or the like on the surface of a steel plate or a galvanized steel plate (Japanese Unexamined Patent Application Publication No. 56-62996). (b) A method of forming a film containing Ag on the surface of a steel plate. (c) A method of treating a steel plate with a treatment solution containing an aqueous solution of iron tannin and an inorganic nitrate (Japanese Unexamined Patent Application Publication No. 1983-1999)
62968). (d) Method of anodizing a Zn-plated steel sheet containing Co and additives (Japanese Patent Application Laid-Open No. 151490, 1983)
151491). However, these known methods (1) are disadvantageous in terms of cost because they use precious metals such as silver, (2) films whose main components are carbon black etc. have poor adhesion, and (3) treatment There are problems such as complicated methods and equipment. The present invention improves the above-mentioned problems and provides a blackened steel sheet with excellent adhesion and the like. (Structure of the Invention) It is known that Zn-Ni alloy plating easily causes cracks in the plating layer due to etching or stress due to residual strain in the plating layer. The present inventors have discovered that by utilizing this property to uniformly generate extremely fine cracks on the surface of the plating layer, a beautiful black color can be obtained, and the present invention has been developed based on this finding. That is, the gist of the present invention is that in a steel sheet having a Zn-Ni alloyed plating layer on the top layer, microclocks having no directionality are uniformly generated over the entire surface of the plating layer. be. A and B in FIG. 1 show examples of the film structure of the blackened steel sheet of the present invention, where A shows a case where the microcracks are deep and B shows a case where the microcracks are shallow. Zn− applied to steel plate 1
The Ni-based alloyed plating layer 2 has uniform microcracks 3 over its entire surface.
FIG. 2 is a microscopic SEM photograph of the surface of this steel sheet showing the distribution of microcracks. In the present invention, known methods such as etching and stress can be used to generate cracks, and although not particularly limited, the cracks to be generated preferably have a width of 0.5 μm or less and a length of 10 μm or less.
However, the crack is generally branched, and the length here refers to the length along the crack between the branching points of the crack. If the size of the crack is larger than this, that is, the width is 0.5μ,
If the length exceeds 10μ, the absorption of light on the surface will be impaired, making it impossible to obtain a beautiful black color. In addition, the crack density is expressed as an area fraction of 10
It is desirable that it be between % and 50%. In a range other than this, light absorption is impaired due to surface roughness, and blackening is not sufficient. Furthermore, the cracks must be uniformly and non-directionally distributed over the entire surface. It is desirable that the plating surface other than cracks be as smooth as possible. If the surface is not smooth, the blackening will be impaired due to diffuse reflection of light at this portion. The blackened steel sheet of the present invention may be used as is, but
Usually, a chromate film, a resin film, or both are formed thereon. The reason why a chromate film, a resin film, or both are formed after blackening is to give the surface a glossy appearance and to adjust the interference color.This process creates a deep and beautiful finish. A black film can be obtained. As the resin film, acrylic resin, epoxy resin, phenol resin, melamine resin, fluororesin, etc. are selectively used depending on the purpose. Appropriate film pressure is 3μ or less. Next, the present invention will be explained with reference to examples. Example 1 Ni 13%, Zn 87%, Zn with plating coverage 20g/ m2
-Ni alloyed electroplated steel sheet at 20℃, 5%
Etching treatment was performed using HNO 3 for different treatment times. The results of the processing time (seconds), the density of microcracks generated in the plating layer, and the blackening status obtained are shown in the table. The microcracks had a width of 0.5μ or less and a length of 10μ or less, had no directionality, and were uniformly distributed in the plating layer.
【表】
○ 良好
× 不良
表から分るように、クラツク密度が、10〜50％
の範囲では美しい黒色化鋼板が得られたが、それ
以外の範囲では、黒色化が損なわれる傾向があ
る。
実施例 ２
Ni12％、Zn88％、メツキ付着量30ｇ／m2のNi
−Znメツキ鋼板を陽極として、CaCl25％、
HNO31％の溶液中で、10A／ｄm2、10秒間の通
電を行つた。
Ni−Znメツキ層の表面に発生したマイクロク
ラツクは、最大巾0.2μ、最大長さ5μで、クラツク
密度25％であり、均一に黒色化された。
（発明の効果）
本発明の黒色化鋼板は、メツキ層を黒色化する
ので密着性良好で、その製法も簡単で裸使用に十
分耐える高級感を有している。[Table] ○ Good × Bad As you can see from the table, the crack density is between 10 and 50%.
A beautiful blackened steel sheet was obtained in the range of , but the blackness tends to be impaired in other ranges. Example 2 Ni 12%, Zn 88%, plating amount 30g/m 2
−Zn plated steel plate as anode, CaCl 2 5%,
Electricity was applied at 10 A/dm 2 for 10 seconds in a 1% HNO 3 solution. The microcracks generated on the surface of the Ni--Zn plating layer had a maximum width of 0.2μ, a maximum length of 5μ, a crack density of 25%, and were uniformly blackened. (Effects of the Invention) The blackened steel sheet of the present invention has a blackened plating layer, so it has good adhesion, is easy to manufacture, and has a luxurious feel that can be used naked.
第１図のイ及びロは、いずれも本発明の皮膜構
造を示す説明図である。第２図は、マイクロクラ
ツクの分布を示すメツキした金属組織の顕微鏡写
真である。
１……鋼板、２……メツキ層、３……マイクロ
クラツク。
A and B in FIG. 1 are both explanatory diagrams showing the film structure of the present invention. FIG. 2 is a micrograph of the plated metal structure showing the distribution of microcracks. 1... Steel plate, 2... Plating layer, 3... Micro crack.
Claims (1)
該メツキ層が、表面全体に方向性をもたないマイ
クロクラツクを均一に有することを特徴とする黒
色化鋼板。 ２ マイクロクラツクが、幅0.5μ以下、長さ10μ
以下である特許請求の範囲第１項記載の鋼板。 ３ メツキ層上に、更に、クロメート皮膜又は樹
脂皮膜あるいはこれら両方を設けた特許請求の範
囲第１、第２項のいずれかに記載の鋼板。[Claims] 1. Having a Zn-Ni alloy plating layer on the top layer,
A blackened steel sheet characterized in that the plating layer uniformly has microcracks without directionality over the entire surface. 2 Micro cracks are 0.5μ or less in width and 10μ in length.
A steel plate according to claim 1, which is as follows. 3. The steel plate according to claim 1, wherein a chromate film, a resin film, or both are further provided on the plating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14936584A JPS6130683A (en) | 1984-07-20 | 1984-07-20 | Blackened steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14936584A JPS6130683A (en) | 1984-07-20 | 1984-07-20 | Blackened steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6130683A JPS6130683A (en) | 1986-02-12 |
| JPS6340865B2 true JPS6340865B2 (en) | 1988-08-12 |
Family
ID=15473544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14936584A Granted JPS6130683A (en) | 1984-07-20 | 1984-07-20 | Blackened steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6130683A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016074199A (en) * | 2014-10-07 | 2016-05-12 | 新日鐵住金株式会社 | Black coated steel sheet |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61227181A (en) * | 1985-03-30 | 1986-10-09 | Sumitomo Metal Ind Ltd | Highly corrosion resistant surface treated steel material |
| US4968391A (en) * | 1988-01-29 | 1990-11-06 | Nippon Steel Corporation | Process for the preparation of a black surface-treated steel sheet |
| US4940639A (en) * | 1988-07-07 | 1990-07-10 | Sumitomo Metal Industries, Ltd. | Zn-Ni alloy-plated steel sheet with improved impact adhesion |
| EP0844316B1 (en) * | 1996-06-06 | 2002-12-11 | Sumitomo Metal Industries, Ltd. | Surface-treated steel sheet excellent in corrosion resistance after working |
-
1984
- 1984-07-20 JP JP14936584A patent/JPS6130683A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016074199A (en) * | 2014-10-07 | 2016-05-12 | 新日鐵住金株式会社 | Black coated steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6130683A (en) | 1986-02-12 |
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