Acid zinc and zinc alloy electroplating solution and process

Details Acid zinc and zinc alloy electroplating solution and process Acid zinc and zinc alloy electroplating solution and process

C - Chemistry, Metallurgy

25

D

204/26, 204/37

C25D 3/22 (2006.01) C25D 3/56 (2006.01)

Patent

CA 1256394

ABSTRACT The invention is concerned with an improved aqueous acid electroplating solution containing zinc ions in an amount effective to electrodeposit zinc, and optionally cobalt and/or nickel ions in an amount effective to electrodeposit a zinc- cobalt, zinc-nickel, and zinc-cobalt-nickel alloy; boric acid and the bath soluble compatible salts thereof present in an amount of at least about 2.5 g/l calculated as boric acid, hydrogen ions present in an amount to provide a pH on the acid side, and a bath soluble and compatible polyhydroxy additive agent con- taining at least 3 hydroxyl groups and at least 4 carbon atoms of the structural formula: Image wherein: R1 is -H, -CH2-OH, an alkyl group containing 1-4 carbon atoms, or a bridging group defined by -R3-; R2 is -H, -OH, -CH2OH, or a bridging group defined by -R4-; -R3- is -CH2-, Image -R4- is -(CH2)c-, or -CH2-O-CH2-; X and Y are the same or different and represent -?-H; -NR5; -SO3H, an alkyl, alkenyl or alkynyl group containing 1 to 4 carbon atoms; an hydroxy alkyl group con- taining 1-4 carbon atoms, or an hydroxy alkenyl or hydroxy alkynyl group containing 3 to 5 carbon atoms; R5 is -H, an alkyl, alkenyl, alkynyl, or hydroxy alkyl group containing 1-4 carbons; a is an integer ranging from 0 - 6; b is an integer ranging from 0 - 6; c is an integer ranging from 1 - 5; and a + b is an integer from 1 - 6; as well as the compatible bath soluble Group IA and IIA, zinc and ammonium salts thereof and mixtures thereof. The electroplating solution of the invention is used for electro- depositing an adherent, ductile zinc, zinc-cobalt, zinc-nickel or zinc-cobalt-nickel alloy deposit on a conductive substrate.

471146

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