发明名称 |
SURFACE-TREATED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE AFTER WORKING |
摘要 |
<p>Object: to develop a material which can be improved in the resistance to corrosion caused by alcoholic fuels after working without detriment to the weldability and without any substantial cost increase. Constitution: a chromate coating is formed on Zn-X-alloy electroplated steel sheets (wherein X is at least one element selected among 3-18 wt.% Ni, 0.02-3 wt.% Co, 25-45 wt.% Mn, and 8-20 wt.% Cr). The crack density of the Zn-X-alloy coating present under the chromate coating is 1,000-150,000/mm<2> in terms of the spot surrounded by the cracks, among which cracks having the maximum width of 0.5 mu m or less account for at least 90 % and cracks whose depths are at least 80 % of the coating thickness account for at least 80 %. <IMAGE></p> |
申请公布号 |
EP0844316(B1) |
申请公布日期 |
2002.12.11 |
申请号 |
EP19960916326 |
申请日期 |
1996.06.06 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
NAGAI, HIROYUKI;KAWANISHI, YOSHIHIRO;KAJIYAMA, EIJI;KASHIWAGI, HIROYUKI;TSUCHIYA, SHINICHI |
分类号 |
C23C22/24;C23C22/30;C23C28/00;C25D3/56;C25D11/38;(IPC1-7):C23C28/00;C22C28/00;C22C38/10;C25D5/26;C22C38/58;C25D5/10;C25D5/48 |
主分类号 |
C23C22/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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