ELECTROLYTE ADDITIVE FOR A COLORANT BATH FOR COLORING ALUMINUM AND PROCESS FOR COLORING ALUMINUM

摘要

The invention describes a novel electrolyte additive for a sulfuric acid tin(II) containing colorant bath for the alternating current coloring of anodized aluminum sur- faces, consisting of a synergistic mixture of at least one antioxidant of on e of the gen- eral formulas (I to IV) and at least one throwing power improver of general formula (V), and to a process for the alternating current coloration of anodized aluminum surfaces using the electrolyte additive of the invention. 16