Al-Mg2 Si composite coatings were fabricated on AZ31 Bmagnesium alloy by the flame spraying with Al and Mg

2

Si mixed powders.The XRD

SEM and EDS were used to analyze the phase composition

microstructure and element distribution of the coating.The potential corrosion and corrosion current density of the sample were investigated by electrochemical experiment

and the corrosion rate of the sample was tested by immersing experiment in the same solution.And then

the micro-hardness was tested.The effect of Al contents on the microstructure and corrosion resistance of the coating was analyzed through above experiments.The results reveal that the relative density of the coating with decrease of cracks and holes is increased with the increase of the content of Al in the coating.The corrosion resistance and micro-hardness of composite coating

where potential corrosion is-1.363 5Vand corrosion current density is 0.457 8 mA/cm

2

and micro-hardness reaches approximately 300 HV

becomes desirable when content of Al is 60%.