| 摘要 |
<p>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 zinccobalt, 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 containing at least 3 hydroxyl groups and at least 4 carbon atoms of the structural formula: 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-, -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 containing 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 electrodepositing an adherent, ductile zinc, zinc-cobalt, zinc-nickel or zinc-cobalt-nickel alloy deposit on a conductive substrate.</p> |
