Process for forming a sparingly soluble chromate coating on zinc

Details Process for forming a sparingly soluble chromate coating on zinc Process for forming a sparingly soluble chromate coating on zinc

1994-10-21

1996-04-16

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148267, C23C 2230, C23C 2233

Patent

active

055078842

ABSTRACT:
A highly corrosion-resistant, highly alkali-resistant, and very paintable chromate film on the surface of a steel substrate coated with Zn-containing metal is formed by coating the substrate with an aqueous chromate bath and drying into place, preferably at a substrate temperature of 60.degree. to 200.degree. C., without a water rinse. The bath contains Cr.sup.6+, Cr.sup.3+, phosphate ions, water-soluble glycol ether (WSGE) and/or poly{vinyl alcohol} (PVA), and optionally silica sol, in amounts giving ratios of Cr.sup.3+ /Cr.sup.6+ =0.25 to 4.0, PO.sub.4 /total Cr=0.1 to 2.5, and (WSGE+PVA)/Cr.sup.6+ =0.1 to 0.5 in the bath.

REFERENCES:
patent: 4006041 (1977-02-01), Brugarolas
patent: 4475957 (1984-10-01), Sander
patent: 4971635 (1990-11-01), Guhde
patent: 5366567 (1991-11-01), Ojino
patent: 5399209 (1995-03-01), Sudg

Affiliated with

Also associated with

Rating

Process for forming a sparingly soluble chromate coating on zinc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for forming a sparingly soluble chromate coating on zinc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for forming a sparingly soluble chromate coating on zinc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-322607