The invention relates to an aqueous, alkaline cyanide-free electrolyte bath for de-positing zinc and zinc alloy coatings on substrate surfaces comprising (a) a source for zinc ions and optionally a source for further metal ions, (b) hydroxide ions, (c) a polymer of general formula I which is soluble in the bath and (d) at least one pyridinium compound of general formula II or III. The electrolyte bath is suitable for the galvanic deposition of bright and even zinc and zinc alloy coatings.
本发明涉及一种无
氰碱性
水性电解液浴,用于在基材表面上沉积
锌和
锌合
金涂层,包括(a)
锌离子来源和可选的其他
金属离子来源,(b)氢氧化物离子,(c)通式I的可溶于电解液浴中的聚合物和(d)至少一种通式II或III的
吡啶化合物。该电解液浴适用于电镀明亮均匀的
锌和
锌合
金涂层。