Process for rejuvenation electroless nickel solution

Details Process for rejuvenation electroless nickel solution Process for rejuvenation electroless nickel solution

1987-05-14

1989-03-21

Pianalto, Bernard

Coating processes

With pretreatment of the base

Preapplied reactant or reaction promoter or hardener

427322, 427404, 4274431, B05D 34, B05D 310

Patent

active

048142050

ABSTRACT:
An aqueous initiator solution and process for rejuvenating such initiator solutions and for prolonging the useful operating life thereof by which copper and copper alloy substrates are treated therein to render them receptive to a subsequent electroless nickel plating step. The detrimental effects of progressive contamination of such aqueous initiator solutions with metal ion complexing agents during commercial use and/or precipitation of the noble metal ions which pregressively impairs the oprativeness of such activator solutions is overcome in accordance with the present invention by the addition of controlled amounts of ferric ions effective to maintain at least a sufficient portion of the noble metal ions in solution in a noncomplexed condition whereby the initiator solution is effective to pretreat the copper substrate prior to electroless nickel plating.

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