SALTS OF AROMATIC HYDROXYL COMPOUNDS AND THEIR USE AS BRIGHTENERS

摘要

The present invention pertains to salts of aromatic hydroxyl compounds of the general formulas (I and II), wherein m, n, R<1>, R<2>, R<3>, R<6>, R<7>, R<8> and Ar are as indicated in the description and X is an alkali metal, alkaline earth metal atom or an amonium radical, and to their use as brighteners in acid electroplating baths. The invention also pertains to acid electroplating baths used for electrolytic deposition of metallic layers on shaped parts, the baths comprising as brightener at least one of the claimed salts of an aromatic hydroxyl compound. Finally, the invention pertains to a method of electrodeposition coating of shaped parts using the claimed acid electroplating baths.