C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/05 (2006.01) C23C 22/18 (2006.01)
Patent
CA 2398771
By including nitric acid and hydroxylamine in a manganese phosphating composition and controlling the ratio of nitric to phosphoric acids and the ratio of Total Acid to Free Acid within a specified range, satisfactory manganese phosphate conversion coatings can be obtained within a reasonable time at temperatures much lower than has previously been thought necessary for operating a manganese phosphating composition with no other metal cations (except possibly for iron).
En introduisant de l'acide nitrique et de l'hydroxylamine dans une composition de phosphatage au manganèse et en dosant le rapport acide nitrique/acide phosphorique et le rapport acide total/acide libre de manière qu'ils se situent dans intervalle déterminé, on peut obtenir des couches satisfaisantes de phosphate de manganèse obtenues par conversion en un temps raisonnable et à des températures considérablement plus basses que ce que l'on croyait jusqu'ici nécessaire pour l'utilisation d'une composition de phosphatage au manganèse ne comprenant pas d'autres cations métalliques (excepté éventuellement du fer).
Henkel Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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