Abstract: The present invention relates to a method for the galvanic deposition of zinc and zinc alloy coatings from an alkaline coating bath with a reduced degradation of organic bath additives. An electrode that contains metallic manganese and/or manganese oxide and is insoluble in the bath is hereby used as an anode. The electrode is produced from metallic manganese or an alloy comprising at least 5% by weight of manganese, or from an electrically conductive substrate and a metallic manganese and/or manganese oxide-containing coating applied thereto, or from a composite material, wherein the coating and the composite material comprise at least 5% by weight of manganese. The method according to the invention is particularly suitable for the galvanic deposition of zinc-nickel alloy coatings from alkaline zinc-nickel baths since the formation of cyanides can be very effectively inhibited.

Abstract: The present invention relates to a method for the galvanic deposition of zinc and zinc alloy coatings from an alkaline coating bath with a reduced degradation of organic bath additives. An electrode that contains metallic manganese and/or manganese oxide and is insoluble in the bath is hereby used as the anode, and is produced from metallic manganese or a manganese-containing alloy, the manganese-containing alloy comprising at least 5% by weight of manganese, or is produced from an electrically conductive substrate and a metallic manganese and/or manganese oxide-containing coating applied thereto, or is produced from a composite material, with both the metallic manganese and/or manganese oxide-containing coating and the composite material comprising at least 5% by weight of manganese, based on the total amount of manganese resulting from metallic manganese and manganese oxide.

Abstract: Plastics and articles made therefrom are metal plated by conditioning their surface by a treatment with sulfur trioxide vapor or a sulfur trioxide containing atmosphere. The thus conditioned plastics or plastic articles are then metal plated, if required, after sensibilization, nucleation or activation, and treatment with a reducing solution. Metal plating is effected by chemical deposition of the metal or by electroplating. The resulting metal layer is reenforced, if required, also by chemical plating or electroplating. The resulting metal coating has a surprisingly high adhesive strength.