C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17, 117/231
C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)
Patent
CA 1293165
ABSTRACT Disclosed is an improved method for ooating a zinc surface comprising treating said surface with an aqueous, acidic solution rantaining: (a) about 0.5 to about 4 percent phosphate ion; (b) an ion selected from the group consisting of zinc ions, manganese ions, and mixtures thereof, said ions being present at a level sufficient to form dihydrogen phosphate with substantially all of said phosphate ions; and (c) abcut 0.01 to about 1 percent complex fluoride ions; wherein the weight:weight ratio of complex fluoride ions:chloride ions in said solution is at a value of about 8:1 or greater. It is preferred that the ratio complex of fluoride ion to chloride ion (F :C1) in said solution to be maintained at a value of greater than about 8:1, preferably greater than about 10:1,and more preferably greater than about 14:1. The select weight:weight complex fluoride chloxide ratio substantially elimunates the abnormal crystal growth fnequently found in treated surfaces while at the same time reduces the need for excess fluoride.
511358
Henkel Kommanditgesellschaft Auf Aktien
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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