Bonderizing of iron and steel after eorrosion on its sand face increased greatly the specific surface area of workpieces, thus enhanced the adhesive force between film coating and basic metal ,and improved highly the antiputrefactive property.

• 钢铁经过砂面腐蚀后进行磷化 ,大大增加了工件的比表面积 ,从而增强了其外涂膜层与基体金属的附着力 ,防腐蚀性能得到大幅提高。