C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/10 (2006.01) C23C 22/74 (2006.01)
Patent
CA 2047786
An improved anticorrosion coating composition for metals is disclosed. Known anticorrosion coating compositions are comprised of (1) a chromic acid compound, or a chromic acid compound and a boric acid compound, (2) powdered zinc, aluminum, or alloy mixture thereof, and (3) a (poly) glycol compound and solvent. The anticorrosion coating composition of the present invention replaces a portion of the chromic acid component in known anticorrosion compositions with a nickel and/or cobalt compound soluble in water and/or soluble in a water-miscible organic solvent. This composition exhibits better corrosion protection in more severely corrosive environments than known anticorrosion coating compositions and with a reduced content of harmful hexavalent chromium.
Higashiyama Takao
Nakazato Michiaki
Nippon Dacro Shamrock Co.
Riches Mckenzie & Herbert Llp
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