METHOD FOR PRODUCING A ZERO-SPANGLE GALVANIZED STEEL PLATE WITH AN EXCELLENT BRIGHTNESS

摘要

The zero spangle steel sheet is produced by (1) galvanizing process of steel sheet as a starting material, and (2) spraying a 20 to 100g/m2 zero spangel agent solution just before the solidification of molten zinc on the surface of the steel sheet. The zero spangle agent is 1 to 2wt.% ammonium dihydrogen phosphate solution. The pressure gap of solution pressure and air pressure at spray nozzle is 3 to 4kg/cm2 on the surface of the steel sheet at 420 to 422deg.C. The produced steel sheet of zero spangle and good brightness is used for automobile and various kinds of household electric appliances.