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Influence of Synergistic Effect of Hydroxylamine Sulphate and Ultrasonic Vibration on Corrosion Resistance of Zinc Phosphating Coating Prepared on 20# Steel

Hydroxylamine sulphate was added to the phosphating solution and constant-intensity ultrasonic vibration was applied during the zinc phosphating treatment of 20# steel. The influence of synergistic effect of hydroxylamine sulphate and constant-intensity ultrasonic vibration on the appearance, surface morphology, phase and corrosion resistance of zinc phosphating coating was studied, and was compared with hydroxylamine sulphate or constant-intensity ultrasonic vibration alone. The results show that the zinc phosphating coating is incomplete without hydroxylamine sulphate and has poor corrosion resistance. Both hydroxylamine sulphate and constant-intensity ultrasonic vibration contribute to the formation of a complete and relatively dense zinc phosphating coating, which is primarily composed of Zn 3 (PO 4 ) 2· 4H 2 O and Zn 2 Fe(PO 4 ) 2· 4H 2 O phases with better corrosion resistance. The synergistic effect of hydroxylamine sulphate and constant-intensity ultrasonic vibration can not only reduce the added amount of hydroxylamine sulphate but likewise prepare a zinc phosphating coating with better compactness and optimal corrosion resistance, which can better inhibit the corrosion of 20# steel.