Acidic nickel electroplating bath containing sulfobetaines as brighteners and levelling agents

摘要

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.