| 摘要 |
An aqueous electroplating bath for nickel, cobalt, nickel-cobalt, nickel-iron, cobalt-iron or nickel-cobalt-iron is described which contains, as a brightening agent, a quaternary amine sulfobetaine of the formula <IMAGE> wherein N+ is a heterocyclic tertiary amine group, R is a halogen or lower alkyl group, R' is a hydrogen, lower alkyl or R''C(O)-group R'' is a lower alkyl group and a is 0-5. These brighteners may be prepared by the reaction of a heterocyclic tertiary amine with an alkali metal halohydrin sulfonate.
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