C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/26
C25D 3/56 (2006.01)
Patent
CA 1222720
Abstract of the Disclosure The present invention relates to an improved electroplating bath and process for producing semi- bright to bright zinc cobalt alloy electrodeposits on substrates, and particularly non-planar substrates, to provide enhanced resistance to salt spray corrosion. The electroplating bath of the invention comprises: as ingredient A, zinc ions; as ingredient B, cobalt ions; as ingredient C, chlorine ions; as ingredient E, benzoic acid, salicylic acid or nicotinic acid and the bath compatible alkali metal and ammonium salts thereof; as ingredient F, benzylidene acetone, as ingredient G, a compound selected from the group consisting of N-allyl thiourea and an amine having the formula N R1 R2 R3 wherein R1 represents an alkyl group of 1 to Y carbon atoms optionally substituted by a hydroxyl group, and R2 and R3 or both represent a hydrogen atom or an alkyl group of 1 to Y carbon atoms optionally substituted by a hydroxyl group or an amino group and R2 and R3 may be the same or different and may be the same as or different to R1, Y being an integer from 2 to 6; and as ingredient H, an ethoxylated long chain acetylenic alcohol; an ethoxylated alkylamine; a polyether having a molecular weight ranging from about 100 to about 1,000,000; a polyalkylene glycol, a poly- glycidol; an ethoxylated phenol, an ethoxylated naphthol; an ethoxylated olefin glycol; an ethoxylated acetylenic glycol and mixtures thereof; the bath containing in- gredients A, B, and C and at least one of ingredients E, F, G and H.
419837
Hadley John S.
Verberne Wim J.c.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Omi International Corporation
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