a method of manufacturing an electro-galvanized sheets with uniform surface appearance

摘要

invention zinc view to reaching pH1.0 ~ 1.4 bath of zinc sulfate dissolved in the produced electricity to suppress the generation of the difference in the width and uneven whiteness galvanized longitudinal direction of the steel sheet after a phosphate treatment of the steel sheet to a uniform surface appearance, and electrical zinc-plated steel sheet production process is the reduction ratio, using the insoluble anode zinc sulfate bath according to the method of manufacturing a galvanized steel sheet can be balanced using an electroplating plant, the coated sodium sulfate and at the same time as the zinc concentration of 150 ~ 200g / l of the bath 30 ~ 50g / l was added to the phosphate treatment was subjected to electroplating and to a method of manufacturing the electro-galvanized steel sheet as a base. According to the present invention, by suppressing the electric galvanized after phosphate width and surface appearance defects in the longitudinal direction of the steel sheet during processing contribute to the improved surface quality as well as increase, decrease power ratio reduction in the cell voltage due to improved electrical conductivity of the plating bath and high-current The effect that can greatly improve the productivity can work in density.