Method for treating aluminum containing surfaces

Details Method for treating aluminum containing surfaces Method for treating aluminum containing surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/07 (2006.01) C23C 22/78 (2006.01) C23G 1/22 (2006.01)

Patent

CA 2099110

ABSTRACT A primary film of Ni, Fe, and/or Co is formed on an aluminum surface and a phosphate film is formed on the aluminum surface on which this primary film has been formed, or on a composite of an aluminum ssurface on which a primary film has been formed and a zinc based coated steel sheet. This method of surface treatment is not ac- companied with pollution problems with Cr6+ ion and F-, and there is little deterioration of the phosphate film forming treatment liquid with use.

Un film primaire de Ni, Fe, et/ou Co est constitué sur une surface d'aluminium, un film phosphate est ensuite constitué sur cette surface d'aluminium ayant reçu ce film primaire, ou sur une surface d'un composite d'aluminium sur laquelle un film primaire a été constitué, avant d'être combiné à une tôle d'acier enduite à base de zinc. Cette méthode de traitement de surface n'entraîne pas les problèmes de pollution courants par l'ion Cr<6+> et par F<->, et l'on constate à l'usage une faible dégradation du liquide de traitement servant à réaliser le film phosphate.

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