Pickling/activation solution for the pretreatment of...

Details Pickling/activation solution for the pretreatment of... Pickling/activation solution for the pretreatment of...

C - Chemistry, Metallurgy

23

G

C23G 1/02 (2006.01) C23C 18/00 (2006.01) C23C 18/18 (2006.01) C23C 18/31 (2006.01)

Patent

CA 2276475

The invention relates to an aqueous preparation for the pickling and activation of aluminum-steel composites prior to electroless dip tinning. Examples of aluminum--steel composites are sliding bearings, bushes, wear disks, dry sliding bearings, etc., for pumps, motors and gear boxes. The pickling/activation solutions for the pretreatment of aluminum-steel composites prior to dip tinning comprise sulfuric acid, hexafluorosilicic acid, wetting agents, transition metal cations and nitrate and/or nitrite ions.

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