MANUFACTURING METHOD OF ZN-NI ELECTROPLATED STEEL SHEET HAVING EXCELLENT CHIPPING RESISTANCE BY ADDITION OF PICKLING ACCELERATOR

摘要

PURPOSE: A method for manufacturing Zn-Ni electroplated steel sheet having excellent chipping resistance by addition of pickling accelerator is provided, which is characterized in that micro roughness is formed along grain boundary of a substrate to be plated to increase adhesion property between the substrate and plating layer. CONSTITUTION: The method is characterized in that a pickling accelerator comprising gluconic acid 5 to 30 wt.%, hydrogen peroxide 5 to 40 wt.%, sodium phosphonate 3 to 15 wt.%, 5 wt.% or less of organic catalyst and a balance of water is added into a 12 % chloride solution in an amount of 0.5 to 10 vol.%, so that micro roughness is formed on steel sheet.