JPS5913599B2 - platinum strike bath - Google Patents
platinum strike bathInfo
- Publication number
- JPS5913599B2 JPS5913599B2 JP15941676A JP15941676A JPS5913599B2 JP S5913599 B2 JPS5913599 B2 JP S5913599B2 JP 15941676 A JP15941676 A JP 15941676A JP 15941676 A JP15941676 A JP 15941676A JP S5913599 B2 JPS5913599 B2 JP S5913599B2
- Authority
- JP
- Japan
- Prior art keywords
- platinum
- bath
- plating
- strike bath
- present
- 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
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Description
【発明の詳細な説明】
本発明は、強酸性の白金めつき用の為の白金ストライク
浴に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a platinum strike bath for strongly acidic platinum plating.
２（従来、食塩電解等においてチタン、チタン合金、
タンタル、タンタル合金、ジルコニウム、ジルコニウム
合金等の耐蝕性金属表面上に白金めつき被覆を施した不
溶性電極が数多く使用されているが、それらの不溶性陽
極を作るには白金の密着性を向 ２、・上させる為に、
耐蝕性金属の素材表面を粗す前処理を行い、然る後白金
の電気めつきを施して作つていた。2 (Conventionally, titanium, titanium alloys,
Many insoluble electrodes with platinum plating coated on the surface of corrosion-resistant metals such as tantalum, tantalum alloys, zirconium, and zirconium alloys are used, but in order to make these insoluble anodes, it is necessary to improve the adhesion of platinum.・In order to raise
It was made by pre-treating the surface of the corrosion-resistant metal material and then electroplating it with platinum.
しカルながら耐蝕性金属の素材表面を粗す前処理を行う
とその表面に剥れ易いスケールが僅かに残り、これが素
材に白金めつきを施す操作 ３１を行つた時、白金めつ
き浴中に一部が落ちる。このため白金めつき浴中に次第
にスケールが蓄積し、白金めつき浴中に浮遊する。その
結果、素材表面に白金めつきを施す度毎にスケールが白
金めつき層に入り込んで著しく寿命の短い不良品として
の ３０下洛性電極となるのでそれ以上白金めつき浴を
使用することができない白金めつき浴の寿命が短いもの
となつていた。このようなことから、白金めつき浴への
異物混入を予め防ぐことができ、白金めつき浴及び不溶
性電極を害さないストライク浴の出現が強く要望フ さ
れていた。However, when pre-treatment is performed to roughen the surface of a corrosion-resistant metal material, a small amount of scale that easily peels off remains on the surface, and when platinum plating is performed on the material (step 31), this is left in the platinum plating bath. Some fall off. For this reason, scale gradually accumulates in the platinum plating bath and becomes suspended in the platinum plating bath. As a result, each time platinum plating is applied to the surface of the material, scale enters the platinum plating layer, resulting in a defective electrode with a significantly short lifespan, so it is no longer possible to use the platinum plating bath. Platinum plating baths that cannot be used have a short lifespan. For these reasons, there has been a strong demand for a strike bath that can prevent foreign matter from entering the platinum plating bath and does not damage the platinum plating bath and the insoluble electrode.
そこで本発明者は上記要望に応える為、鋭意攻究の結果
、素材の表面に付着している剥れ易いスケールを強性的
に除去せしめることのできる白金ストライク浴を見い出
したものである。In order to meet the above-mentioned needs, the inventors of the present invention conducted extensive research and discovered a platinum strike bath that can strongly remove easily peelable scales attached to the surface of materials.
Ｏ 本発明の白金ストライク浴は、金属白金として白金
０．１〜３ｆｌ／ｌと遊離硫酸７０〜５００ｙ、Ｉとの
組成から成るものである。O The platinum strike bath of the present invention has a composition of 0.1 to 3 fl/l of platinum as metal platinum and 70 to 500 y, I of free sulfuric acid.
ストライク浴に白金を用いた理由は、初期の白金の核を
生成させ、めつき被覆の成長を促進させ５ ることがで
きるからであり、またストライク浴において通常素材表
面上からの不純物を溶解させるには、強酸が用いられる
が本発明では特に回収方法の容易さから遊離硫酸を用い
たものである。The reason why platinum is used in the strike bath is that it can generate initial platinum nuclei and promote the growth of the plated coating5, and it also dissolves impurities normally present on the surface of the material in the strike bath. A strong acid is used for this purpose, but in the present invention, free sulfuric acid is used because of the ease of the recovery method.
然して本発明の白金ストライク浴において、上フ 記組
成範囲に限定した理由について説明すると、浴中遊離硫
酸７０ｇ／ｌ未満では活性不足の為白金めつきの密着性
を悪くし、５００１／ｌを超えると白金の析出効率を害
するので、遊離硫酸は７０〜５００ｆｌ／ｌが適当であ
る。また白金が・ Ｏ、１ｇ／ｌ未満ではストライク浴
の特性の１つである素材面に形成される白金の核が発生
しにくくなり、３１／ｌを超えると白金の核の発生は阻
害されないが、貴金属の希少価値を考慮して白金は０．
１〜３θ／ｌが適当である。かかる成分組成の本発明白
金ストライク浴は、素材表面の剥れ易いスケールを強制
的に除去することができるので、白金めつき浴の寿命を
著しく増長させることができ、且つ素材に被覆される白
金めつき層にスケールを混入することがないとい） う
優れた効果を有するものである。However, in the platinum strike bath of the present invention, to explain the reason why the composition is limited to the above composition range, if the free sulfuric acid in the bath is less than 70g/l, the adhesion of platinum plating will be poor due to lack of activity, and if it exceeds 5001/l, the platinum plating adhesion will be poor. Free sulfuric acid is preferably 70 to 500 fl/l since it impairs platinum precipitation efficiency. Furthermore, if the platinum content is less than 1 g/l, platinum nuclei forming on the material surface, which is one of the characteristics of the strike bath, will be difficult to generate, and if it exceeds 31/l, the generation of platinum nuclei will not be inhibited. , considering the scarcity value of precious metals, platinum is 0.
1 to 3θ/l is suitable. The platinum strike bath of the present invention having such a component composition can forcibly remove scales that easily peel off from the surface of the material, thereby significantly extending the life of the platinum plating bath. It has an excellent effect in that it does not mix scale into the plating layer.
次に本発明の効果を明瞭ならしめる為に本発明の具体的
な実施例を挙げて詳細に説明する。Next, in order to make the effects of the present invention clear, specific examples of the present invention will be described in detail.
金属白金として白金０．５９／１１遊離硫酸１１０ｆ！
／ｌの本発明の白金ストライク浴を２０℃の液温で５０
ｍｍ×５０ｍ１Ｌのチタン板に６０秒間５Ａ／Ｄｍ２の
電流密度で白金ストライクを行つた。このサンプルをジ
ニトロジアミン白金酸のめつき浴にて白金めつき被覆を
施した結果、１００枚以下では素材から剥れたスケール
が白金めつき層に混入しなかつた。一方本発明の白金ス
トライク浴を用いず、直接上記と同様のめつき浴とめつ
き方法にて白金めつきを施した結果５０枚以上になると
、白金めつき層中に素材表面から剥れたスケールが混入
し始めた。Platinum 0.59/11 free sulfuric acid 110f as metal platinum!
/l of the platinum strike bath of the present invention at a liquid temperature of 20°C.
A platinum strike was performed on a titanium plate measuring mm x 50 ml for 60 seconds at a current density of 5 A/Dm2. When this sample was coated with platinum plating in a plating bath of dinitrodiamine platinum acid, the scale peeled off from the material did not mix into the platinum plating layer when the number of sheets was 100 or less. On the other hand, when platinum plating is directly performed using the same plating bath and plating method as described above without using the platinum strike bath of the present invention, when the number of sheets exceeds 50, scales peeled off from the surface of the material appear in the platinum plating layer. started to mix in.
上記の結果で明らかなように本発明の白金ストライク浴
を用いると強制的に素材表面の剥れ易いスケールを除去
せしめることができるので、白金めつき被覆を施した際
白金めつき浴中に前記スケールが落ちることがなく、白
金めつき浴自体の老化を防止できて寿命が増長し、且つ
素材に被覆した白金めつき層にもスケールが混入するこ
とがないという優れた効果を奏する。As is clear from the above results, when the platinum strike bath of the present invention is used, it is possible to forcibly remove scale that easily peels off from the surface of the material. This has the excellent effect that scale does not fall off, the platinum plating bath itself can be prevented from aging and its lifespan is extended, and the platinum plating layer coated on the material is not contaminated with scale.
Claims (1)
０〜５００ｇ／ｌの組成から成る白金ストライク浴。1 Platinum 0.1-3 g/l as metal platinum and free sulfuric acid 7
Platinum strike bath consisting of a composition of 0 to 500 g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15941676A JPS5913599B2 (en) | 1976-12-28 | 1976-12-28 | platinum strike bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15941676A JPS5913599B2 (en) | 1976-12-28 | 1976-12-28 | platinum strike bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5382625A JPS5382625A (en) | 1978-07-21 |
| JPS5913599B2 true JPS5913599B2 (en) | 1984-03-30 |
Family
ID=15693261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15941676A Expired JPS5913599B2 (en) | 1976-12-28 | 1976-12-28 | platinum strike bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5913599B2 (en) |
-
1976
- 1976-12-28 JP JP15941676A patent/JPS5913599B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5382625A (en) | 1978-07-21 |
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