Because metal zinc increases to zinc oxide or zinc oxide, the volume increases by 3 to 5 times, and the white rust is large. As a result, the degree of corrosion of white rust seems to be much more serious than the actual situation, which seriously affects the appearance of the coating, but in fact, they only cause zinc with little zinc losses. For thicker structural parts, the white rust usually has no effect on the durability and service life of the plating layer or has no significant effect.