发明名称 |
Corrosion resistant, chromate-free conversion coating for magnesium alloys |
摘要 |
The present invention relates to a process for forming a chromate-free, corrosion resistant coating on a product formed from magnesium or a magnesium alloy and to a solution used for forming the coating. The solution has phosphate and fluoride ions and contains from 1.0 g/l to 5.0 g/l of an active corrosion inhibitor selected from the group consisting potassium permanganate, sodium tungstate, sodium vanadate, and mixtures thereof. The solution may also contain from 0.1 to 1.0 vol% of a surfactant which reduces reaction time. The solution is maintained at a temperature of 120 to 200 DEG F (49 to 93 DEG C) and has a pH of 5 to 7. The process for forming the coating broadly comprises degreasing the magnesium or magnesium alloy product in a degreasing solution, cleaning the product in a highly alkaline cleaning solution, deoxidizing the product in a deoxidizing solution, and immersing the product in the coating solution for a time period of 15 minutes to 90 minutes. <IMAGE>
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申请公布号 |
EP1338678(A2) |
申请公布日期 |
2003.08.27 |
申请号 |
EP20030250845 |
申请日期 |
2003.02.11 |
申请人 |
UNITED TECHNOLOGIES CORPORATION |
发明人 |
JAWOROWSKI, MARK;KRYZMAN, MICHAEL A.;TANG, XAI;BRILES, OWEN M. |
分类号 |
C23C22/36;C23C22/44;C23C22/68;(IPC1-7):C23C22/22 |
主分类号 |
C23C22/36 |
代理机构 |
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主权项 |
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地址 |
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