Process for the chemical surface treatment of an aluminous produ

Details Process for the chemical surface treatment of an aluminous produ Process for the chemical surface treatment of an aluminous produ

1988-03-28

1989-07-04

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148 615Z, 148 615R, 134 2, C23C 2278

Patent

active

048447480

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.

REFERENCES:
patent: 4762638 (1988-08-01), Dollmar

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