Corrosion resistant chromate conversion coatings for heat-treate

Details Corrosion resistant chromate conversion coatings for heat-treate Corrosion resistant chromate conversion coatings for heat-treate

1991-03-19

1992-06-23

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148268, C23C 2244

Patent

active

051239787

ABSTRACT:
An improved method of coating 7000 series aluminum alloys, which are difflt to coat uniformly, with a coating resistant to long term corrosion in a salt spray environment is disclosed. By using a chromate solution of very low pH and applying that solution first as a cleaner, followed by brush application to form the final coating, an extended resistance to corrosion at least 2 to 3 times the usual duration is achieved readily.

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