Passivation process and copmposition for zinc-aluminum alloys

Details Passivation process and copmposition for zinc-aluminum alloys Passivation process and copmposition for zinc-aluminum alloys

1987-06-10

1989-03-14

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2233

Patent

active

048121754

ABSTRACT:
An aqueous acidic treating solution and process for forming a chromium-containing passivate coating on the surface of zinc or zinc-aluminum alloys to enhance bare corrosion resistance and inhibit discoloration thereof upon exposure to ambient environments. The treating solution contains as its essential constituents, chromium ions, nitrate ions, phosphate ions.

REFERENCES:
patent: 2327002 (1943-08-01), Thomson
patent: 2497905 (1950-02-01), Ostrander
patent: 2527828 (1950-10-01), Kruszynski
patent: 2634224 (1953-04-01), Faucher
patent: 3074827 (1963-01-01), Hoover
patent: 3219489 (1965-11-01), Bellinger
patent: 4131489 (1978-12-01), Newhard

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