C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/33 (2006.01) C04B 28/34 (2006.01)
Patent
CA 2169193
A solid 10-200 mg/m2, calculated as chromium metal, film is formed on a zinciferous surface by coating the surface with an acidic aqueous liquid composition that contains hexavalent chromium ions, trivalent chromium ions, at least one of sulfate ions and nitrate ions, and zinc, nickel, cobalt, and/or aluminum ions, in which liquid composition the trivalent chromium ion/hexavalent chromium ion molar ratio is 1/9 to 4/1, the (nitrate + sulfate + phosphate)/(hexavalent chromium ion + trivalent chromium ion) molar ratio is 0.1 to 2.0 and the metal ion/inorganic acid molar ratio is 0.05 to 1, and subsequently drying the applied coating. The chromate film formed has both an excellent resistance to blackening and an excellent resistance to white rust.
Un film solide de 10-200 mg/m<2>, exprimés en chrome métal, est formé sur une surface zincifère par enduction de celle-ci avec une composition liquide aqueuse acide contenant des ions chrome hexavalents, des ions chrome trivalents, au moins des ions sulfate ou des ions nitrate, et des ions zinc, nickel, cobalt, et/ou aluminium. Dans cette composition liquide, le rapport molaire des ions chrome trivalents/ions chrome hexavalents est de 1/9 à 4/1, le rapport molaire (nitrate + sulfate + phosphate)/(ions chrome hexavalents + ions chrome trivalents) est de 0,1 à 2,0 et le rapport molaire ions métal/acide inorganique est de 0,05 à 1. Le revêtement appliqué est ensuite séché. Le film de chromate formé présente une excellente résistance au noircissement et à la rouille blanche.
Kawaguchi Jyun
Mizuno Kensuke
Ogino Takao
Fetherstonhaugh & Co.
Henkel Corporation
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