Abstract
Zinc phosphating is a well-known chemical conversion coating process for the surface of a metal to increase paint adhesion. The SA335P22 graded low alloy steel is widely used in many aspects due to its hardenability, high fatigue strength and toughness. However, Cr and C contents in SA335P22 steels are found to be obstacles in forming phosphate coating by the traditional process, such as a very few nucleation of Zn phosphate or uncontrollability of crystal size. In this present research, the phosphating of Mn modified Zn was studied to make an efficient phosphating surface for improvement of corrosion resistance as well as good paint adhesion. The surface conditioning solution was applied to assist the nucleation of Zn phosphate at the surface. Moreover, the phosphating temperature was adjusted in the range of 50 to 60 °C. According to the microstructure, it was revealed that the solution having more concentration of phosphoric acid effectively reacted with the steel surface, subsequently uniformed phosphating layers were obtained. After phosphating, paint layers were applied on and the evaluation was performed on adhesion by tape testing and salt spray testing.
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