Non-chromate chemical treatments used on magnesium alloys
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United States of America Patent
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Nov 13, 2001
Grant Date -
N/A
app pub date -
Jan 20, 2000
filing date -
Oct 21, 1999
priority date (Note) -
Expired
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Abstract
Formulations and a process are disclosed for chemically treating a surface of a product made from magnesium alloys. One formulation comprises an acid pickle comprising hydrofluoric acid and a binary alcohol and a second formulation comprises a conversion solution comprising nitric acid, permanganate, and ammonium acid difluoride. The process comprises degreasing the product with alkaline solution, rinsing the product with water, pickling the product with the acid pickle, rinsing the product with water, modifying the product using the modifying solution, rinsing the product with purified water, and drying the product by heating.
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