PRODUCTION OF ZN-NI ALLOY PLATED STEEL SHEET EXCELLENT IN PLATING LAYER ROUGHNESS, ADHESION AND PROCESSABILITY AND PLATING SOLUTION THEREOF

摘要

PURPOSE: A process for preparing the titled alloy steel sheet by adding ammonium chloride and a mixture of sodium salt condensed naphthalene sulfonic acid, sodium sulfate and o-vanillin as an additive to a basic solution is provided. Whereby, the Zn-Ni alloy plated steel sheet has excellent plating layer roughness, adhesion and processability. CONSTITUTION: In a process for producing Zn-Ni alloy plated steel sheet by electroplating under conditions of 0.5 to 2.0 molar concentration of a zinc ion, 0.1 to 0.5 molar concentration of nickel ion, 6.0 to 9.0 molar concentration of a chloride ion, a pH of a plating solution of 2.5 to 4.5, a temperature of the plating solution of 55 to 75deg.C, a current density of 40 to 180A/dm¬2 and a relative speed between the plating solution and the cathode of 0.5 to 2.5m/sec, the ammonium ion of the plating solution is maintained in a concentration of 0.1 to 0.5 mol and a plating solution obtained by adding 0.05 to 5.0g/L o-vanillin to a basic solution is used.