The material of wire rod and wire rope is the controlling factor in the process of galvanizing, which requires that the appearance quality of wire rod should be recorded, and the appearance size and service life should be within the specified range. Pickling and phosphating. Pickling is to remove mill scale vaporized on the surface. Pickling process mainly controls the concentration of acid and the maximum content of ferrous oxide. Phosphating is to increase the smoothing effect. The ratio of total acid to free acid and the content of zinc oxide should be controlled.