发明名称 |
Hard anodic coating for magnesium alloys |
摘要 |
A two-step process for the coating of magnesium and its alloys is disclosed. The first step comprises immersing the magnesium workpiece in an aqueous solution comprising about 0.2 to 5 molar ammonium fluoride having a pH of about 5 to 8 and a temperature of about 40 DEG to 100 DEG C. The second step is an electrochemical treatment of the pretreated article in an aqueous electrolytic solution having a pH of at least about 12.5 and which solution comprises about 2 to 12 g/L of a aqueous soluble hydroxide, about 2 to 15 g/L of a fluoride-containing composition selected from the group consisting of fluorides and fluorosilicates, and about 5 to 30 g/L of a silicate. This process results in a superior coating which has increased abrasion and corrosion resistance.
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申请公布号 |
US5470664(A) |
申请公布日期 |
1995.11.28 |
申请号 |
US19940271052 |
申请日期 |
1994.07.06 |
申请人 |
TECHNOLOGY APPLICATIONS GROUP |
发明人 |
BARTAK, DUANE E.;LEMIEUX, BRIAN E.;WOOLSEY, EARL R. |
分类号 |
C25D11/30;(IPC1-7):B32B15/04 |
主分类号 |
C25D11/30 |
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地址 |
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