The surface color is soft and have aesthetic appearance with strong filmadhesion.
表面色调柔和美观，膜层附着力极强。
2
The corrosion resistance of phosphate coating is limited and is generally used as the bottom coating in order to improve the filmadhesion and corrosion resistance.
磷化膜的耐蚀性有限，一般作为涂装的底层，以提高涂层与基体的附着力和改善涂层的耐腐蚀性能。
3
This paper introduces emphatically a kind of chemical treatment process prior to the coating on the die casting pieces of aluminium-silicon alloy and its filmadhesion.