STEEL PLATE ELECTROPLATED WITH ZINC-MANGANESE ALLOY HAVING EXCELLENT CORROSION RESISTANCE IN SALT WATER ENVIRONMENT

摘要

PURPOSE:To provide a steel plate electroplated with Zn-Mn alloy having improved corrosion resistance in salt water environment by electroplating a Zn-Mn alloy of a specific compsn. on the surface of a steel plate to specific thickness. CONSTITUTION:Zn-Mn alloy plating consisting of 15-70wt% Zn and 30-85% Mn is applied by an electroplating method at 5-40g/m2 on the surface of a steel plate. Here, a complexing agent such as sodium citrate is added to the plating bath so that the plating of a wide range of compsn. is obtained. The steel plate electroplated with the Zn-Mn alloy having excellent corrosion resistance in salt water environment and suited for automobiles, etc. is obtained stably by the above-mentioned plating treatment.