Chromating method of zinc-based plated steel sheet

Details Chromating method of zinc-based plated steel sheet Chromating method of zinc-based plated steel sheet

1991-10-02

1993-07-27

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148267, C23C 2233

Patent

active

052307506

ABSTRACT:
A chromating liquid for forming a chromate film on a Zn or Zn-alloy plated steel sheet, is prepared by adding and mixing a silane coupling agent in a molar ratio of from 0.05 to 0.3 relative to Cr.sup.6+ contained in an aqueous chromating liquid which contains 1-30 g/l of Cr.sup.6+ and 1-30 g/l of Cr.sup.3+ at a weight ratio of Cr.sup.6+ /Cr.sup.3+ ranging from 0.1 to 2.0; and further contains 1-59 g/l of hydrofluoric acid and 1-59 g/l of phosphoric acid at total of hydrofluoric acid and phosphoric acid ranging from 2 to 60 g/l and at a weight ratio of (fluoride ions+phosphate ions)/Cr.sup.3+ ranging from 0.5 to 3.5. and, further said chromating liquid is applied on a surface of the zinc-based plated steel sheet and is then dried, thereby forming the chromate film having a coating amount of from 10 to 150 mg/m.sup.2 in terms of the chromium.

REFERENCES:
patent: 5141575 (1992-08-01), Yoshitake

Affiliated with

Also associated with

Rating

Chromating method of zinc-based plated steel sheet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Chromating method of zinc-based plated steel sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromating method of zinc-based plated steel sheet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2339968