C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/34 (2006.01) C23C 22/00 (2006.01)
Patent
CA 2677753
The corrosion resistance of a metal substrate surface treated with an acidic aqueous composition to form a conversion coating is improved by first contacting the surface with an oxidizing acidic pre-rinse, such as an aqueous solution of nitric acid and hydrogen peroxide, or nitric acid and hydrofluoric acid, or Fe+3 cations and hydrofluoric acid.
La présente invention concerne un procédé permettant d'améliorer la résistance à la corrosion d'une surface d'un substrat métallique avec une composition aqueuse acide pour former un revêtement de conversion comprenant d'abord la mise en contact de la surface avec une solution de pré-rinçage acide oxydant, telle qu'une solution aqueuse d'acide nitrique et de peroxyde d'hydrogène, ou d'acide nitrique et d'acide fluorhydrique, ou des cations de Fe+3 et d'acide fluorhydrique.
Bryden Todd R.
Goodreau Bruce
Kapic Edis
Liang Jeng-Li
Liu Jianping
Henkel Ag & Co. Kgaa
Kirby Eades Gale Baker
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