ZN-CR-P ALLOY ELECTROPLATED STEEL SHEET HAVING SUPERIOR CORROSION RESISTANCE, WELDABILITY AND CHEMICAL CONVERTIBILITY

摘要

PURPOSE:To produce a Zn alloy electroplated steel sheet having superior corrosion resistance in the naked state, superior weldability and chemical convertibility by forming a Zn-Cr-P alloy plating layer having a specified compsn. on the surface of a steel sheet. CONSTITUTION:The surface of a steel sheet is electroplated with a Zn-Cr-P alloy consisting of 2-14% Cr, 1.0-5.0% P and the balance Zn to obtain a steel sheet having superior corrosion resistance in the naked state, superior weldability and chemical convertibility and used for an automobile, household electrical appliances, building materials, etc.