Al-Mg

3

Sb

2

composite coating was prepared on the surface of magnesium alloy AZ31B by thermal spraying

and the influence of friction frequency on tribological properties of the coating in dry and3.5% NaCl solution was analyzed.The cross sectional morphology and phases of the coating were observed by SEM and XRD.The open circuit potentials and friction coefficients with different friction frequencies of the coating were measured by a corrosion abrasion tester.The sectional profiles and wear volume of wear tracks on Al-Mg

3

Sb

2

coating were tested by ultra deep field 3D microscope.The results show that the open circuit potentials of coating are decreased with the increase of friction frequencies in 3.5%NaCl solution.The friction coefficients of the coating are decreased and the wear rates are increased with the increase of frequency under two conditions.And the friction coefficients and wear rates of the coating in 3.5%NaCl solution are all lower than those of ones under dry condition.The spalling of wear scar of the coating under dry friction condition is more and more obvious with the increase of friction frequency.In the 3.5%NaCl solution

the surface of the wear scar exhibits smooth

and a small amount of spalling pits appear with the increase of friction frequency.