Composition and process for forming improved, non-cracking chrom

Details Composition and process for forming improved, non-cracking chrom Composition and process for forming improved, non-cracking chrom

1991-06-28

1993-12-07

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2237

Patent

active

052680428

ABSTRACT:
Improved chromate conversion coating composition for forming non-cracking conversion coatings on aluminum or its alloys. Improvement is obtained by control of the total acid (TA) and free acid (FA) levels to a minimum of 6.0 and 3.5 respectively with a TA:FA ratio in the range of 1.5 to 2.5 by inclusion of aluminum nitrate in the composition.

REFERENCES:
patent: 3347713 (1967-10-01), Lodeesen et al.
patent: 3391031 (1968-07-01), Russel et al.

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