发明名称 |
Using electrical discharge surface preparation for thermal coatings |
摘要 |
A method of preparing the surface of a conductive metal to be non-smooth and non-passivated for reception of thermal sprayed coatings. The method comprises melting and rapidly solidifying globules of the surface by electrical discharge by bring an electrode (anode) in close gap-sparking proximity to the surface, filling the gap with an electrolyte containing a halogenated hydrocarbon fluid present in an amount of 2-5% of the electrolyte, and imposing a pulsed DC voltage (i.e. 20-100 volts at 40-200 amps) on the electrode to provide cyclical sparking between the electrode and the surface through the electrolyte resulting in a breakdown of the hydrocarbon to release nascent halogen atoms which attack the surface to prevent passivation during melting and solidification of the globules. The electrolyte is preferably cooled to a temperature below 65 DEG F. during the sparking, and the halogenated hydrocarbon is preferably present in a sufficient amount to attack silicon and aluminum, if such surface is an aluminum alloy containing silicon.
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申请公布号 |
US5648122(A) |
申请公布日期 |
1997.07.15 |
申请号 |
US19940314014 |
申请日期 |
1994.09.28 |
申请人 |
FORD MOTOR COMPANY |
发明人 |
RAO, V. DURGA NAGESWAR;ROSE, ROBERT ALAN;PARSONS, ROBERT S.;YEAGER, DAVID ALAN |
分类号 |
B23H1/08;B23H9/00;C23C4/02;(IPC1-7):B05D3/14 |
主分类号 |
B23H1/08 |
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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