Process for the electrolytical coating of an object of steel on one or both sides

摘要

PCT No. PCT/AT92/00068 Sec. 371 Date Dec. 20, 1993 Sec. 102(e) Date Dec. 20, 1993 PCT Filed May 13, 1992 PCT Pub. No. WO92/20839 PCT Pub. Date Nov. 26, 1992The invention describes a process for the electrolytical coating of an object of steel on one or both sides. Preferably, the object is a steel strip with zinc or a zinc iron alloy. Zinc or a zinc iron alloy is deposited on the object when the object is connected to form the cathode of a galvanic cell in an aqueous solution of zinc chloride and iron chloride with a pH of 0.1 to 3.0. The zinc chloride solution has a concentration of 50 to 1000 g/l for the deposition of metallic zinc. A partial flow of electrolyte solution is past continuously into a column filled with metallic zinc, where the trivalent iron formed there during the electrolysis is reduced to a bivalent iron, and metallic zinc is dissolved simultaneously therewith. The invention also describes an apparatus for the electrolytical coating of an object of steel.