METHOD FOR MANUFACTURING A ELECTRO-ZINC PLATING STEEL SHEETS WITH AN EXCELLENT SURFACE BRIGHTNESS

摘要

This process manufactured the steel sheet of good surface brightness or high reflection of light by continuous electro-plating without adding brightener and controlling of various ion concentrations in plating solution. The good surface brightness is formed obtained by decreasing the crystal size of zinc, and increasing the degree of preferred gradient of zinc in this process. The conditions of plating are that: (a) the plating bath is of chloride system, (b) the pH of plating solution is 3 to 7, (c) the temperature of plating bath is 40 to 60deg.C, (d) the concentration of zinc chloride is 100 to 150g/L, and/or (e) the added conductive aiders are potassium chloride and ammonium chloride, and/or (f) the concentration of aiders is up to 100g/L, and (g) the degree of preferred gradient in the zinc base plane of the highest atomic density is over 6.