The effects of Al content including 80%

60%

40%

20%content on the tribocorrosion properties of Al-Mg

2

Si composite coating were investigated.The open circuit potential

frictional coefficient

corrosion resistance and tribocorrosion behaviors of the coatings prepared were characterized by scanning electron microscopy

electrochemical testing

reciprocating-sliding tribometer and ultra-depth three-dimensional microscope.The results reveal that the potential of Al-Mg

2

Si coating is the higher than that of AZ31B magnesium alloy

and with decreasing in the content of Al

the potential shift is increased.The positive displacement of Al-80Mg

2

Si coating is the most

which is shifted 0.528 8V

and the corrosion current density is 3.298×10

-3

mA/cm

2

.Furthermore

with decreasing in Al addition

the wear rate and friction coefficient of the coating are decreased.The wear rate and friction coefficient reach4.27×10

-3

mm

3

/（N獉mm）and 0.78

respectively

with 20%Al content.