Process of postrinsing conversion layers

Details Process of postrinsing conversion layers Process of postrinsing conversion layers

C - Chemistry, Metallurgy

23

C

C23C 22/83 (2006.01)

Patent

CA 2057825

-24- ABSTRACT Conversion layers on metal surfaces, particularly of steel, galvanized steel, zinc alloy- coated steel and/or aluminum, are prepared for a pain- ting and/or for an application of adhesive in that they are rinsed with an aqueous solution which contains Ce(IV) and/or Ce(III) in a total amount of 0.01 to 1.0 g/l and which has a pH value of 3 to 6. A post- rinsing solution which is preferably employed contains Ce(III) and Ce(IV) in a weight ratio of 9 to 2 : 1 and optionally also contains molybdate and/or tungstate. Preferred uses of the process serve to prepare metal surfaces provided with conversion layers for the suc- ceeding electro-dipcoating, particularly the cathodic electro-dipcoating, or for the postrinsing of metal surfaces provided with conversion layers which consist of phosphate layers or of layers formed by a chromium- free, acid process using Zr and/or Ti, F and optionally PO4, or of complex metal oxide layers.

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