Acidic nickel electroplating bath containing sulfobetaines as brighteners and levelling agents
AssigneeBASF SE
InventorsManfred Patsch, Dieter Schneider, Guenther Gotsmann, Albert Hettche
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Abstract
An acidic nickel electroplating bath containing brighteners and levelling agents, wherein the levelling agents are compounds of the formula I ##STR1## where N is a hetero-aromatic nitrogen base, R, R.sup.1 and R.sup.2 are hydrogen or alkyl, R.sup.3 is arylene, X is SO.sub.3.sup.-, Y is a neutralizing cation, n is from 1 to 3 and m is from 1 to 2.5.
Claims2
An acidic nickel electroplating bath of conventional composition, containing brighteners and levelling agents, wherein the said brighteners and levelling agents comprise one or more compounds of the formula I ##STR49## where N is a mononuclear or polynuclear heterocyclic-aromatic nitrogen base, R, R.sup.1 and R.sup.2 are hydrogen or C.sub.1 -C.sub.4 -alkyl, and may be identical or different from one another, R.sup.3 is phenylene or thienylene, either of which is unsubstituted or substituted by chlorine, bromine, C.sub.1 -C.sub.4 -alkyl, methoxy or ethoxy, X is SO.sub.3.sup..crclbar., Y is an alkali metal ion, ammonium ion or substituted ammonium ion or half of an alkaline earth metal cation or of a divalent transition metal cation, n is from 1 to 3 and m is from 1 to 2.5.
Dependencies are inferred from the claim text.