| 发明名称 |
Passivation method and composition. |
| 摘要 |
<p>A method for passivating a galvanised metal surface by contact with an aq. soln. contg. 0.5-50% phosphoric acid and 0.1-5% boric acid. Also claimed is a soln. contg. 0.5-50% phosphoric acid 0.1-5% boric acid and 0-0.5% molybdic acid free of chromium. Also claimed is a method for passivating a galvanised metal surface using a soln. as described above.</p> |
| 申请公布号 |
EP0639656(A2) |
申请公布日期 |
1995.02.22 |
| 申请号 |
EP19940304108 |
申请日期 |
1994.06.08 |
| 申请人 |
BETZ EUROPE, INC. |
发明人 |
OUYANG, JIANGBO;HARPEL, WILLIAM LESTER |
| 分类号 |
C23C22/08;C23C22/42;C23C22/74;(IPC1-7):C23C22/07;C23C22/83;C23C22/82 |
主分类号 |
C23C22/08 |
| 代理机构 |
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| 主权项 |
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