Nickel bath

Details Nickel bath Nickel bath

C - Chemistry, Metallurgy

25

D

204/30

C25D 3/12 (2006.01)

Patent

CA 1230576

ABSTRACT In some cases, it is necessary to coat aluminum with nickel, and the most difficult operating conditions are probably met here in the case of aluminum pistons in internal combustion engines. With known processes, adhesion problems occur in the further coating with other metals. Without intermediate activation, satisfactory solutions are not obtained. However, the problem is solved by high proportions of nickel sulfate, small proportions of an acid which stabilizes the pH values, and very small proportions of a fluoride which loosens the oxide layer appearing in the Licer bath, of a chloride which promotes the dissolution of the nickel anodes and of a phosphate which improves the adhesive strength of the nickel layer. If solids, such as silicon carbide or boron carbide are present in the nickel bath, they are kept in suspension by vigorous circulation, for example by means of air. The particle size should preferably be 3 micrometers.

461017

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