ZN ALLOY PLATING BATH EXCELLENT IN DEPOSITION EFFICIENCY OF IRON-FAMILY ALLOYING ELEMENT, ZN ALLOY PLATING METHOD AND PRODUCTION OF ZN ALLOY-PLATED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a Zn alloy plating bath for efficiently depositing the alloying elements such as Ni, Co, Fe and Cr without need to modify an equipment on a large scale, its alloy plating method and the method for producing a Zn alloy-plated steel sheet. ;SOLUTION: In an alloy electroplating bath consisting essentially of zinc and contg. one or ≥2 kinds among nickel, cobalt, iron and chromium, the concns. of Na⁺, SO₄^2-, NH₄^-, Al³⁺, Mg²⁺, K⁺ and Li⁺ (in mol/l) in the plating bath satisfy the inequality, 407 Na⁺+11×SO₄^2-+9×NH₄^-+31×Al^3-+16×Mg²⁺+7×K⁺6×Li⁺70, alloy plating is conducted in the bath, and a zinc alloy-plated steel sheet is produced with excellent deposition efficiency of the iron-family alloying elements and high current efficiency.;COPYRIGHT: (C)1998,JPO