Process for the chemical surface treatment of an aluminous product with a view to its phosphating
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United States of America Patent
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Jul 4, 1989
Grant Date -
N/A
app pub date -
Mar 28, 1988
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This process for treating surfaces of products dip-coated in a bath of molten zinc and aluminum, and intended to be phosphated, involves pickling, preceding the phosphating, with a highly alkaline solution of high pH and containing zinc in solution. The process applies chiefly to products whose coating contains a high proportion of aluminum, particularly in the case of galvanized sheet metal, which it makes easier to phosphate. It is used for painted sheet metal for motor vehicles.
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