Al

3

Ti reinforced Al-based composite coating was prepared by laser cladding on the surface of AZ91D magnesium alloy with Al

Ti and Ni/C mixed powder as raw materials

and compared with substrate and Al coating. Morphology and phase composition of the coatings were analyzed with scanning electron microscope and X-ray diffractometer. Hardness and corrosion resistance of the coatings were measured with microhardness tester and electrochemical workstation. The results show that the Al coating consists of Al

3

Mg

2

and Al

12

Mg

17

phases and the reinforcing phase Al

3

Ti is synthesized in situ in the coating with 10%（Ti+Ni/C）. Compared with the substrate

the hardness and corrosion resistance of the coatings are significantly improved. Compared with Al coating

the average hardness of the coating with 10%（Ti+Ni/C）increased by 41%

the self-corrosion potential increased by 167 mV

the self-corrosion current density decreased slightly

and the corrosion resistance is further improved. The EIS test results showed that the Rc and Rct values of the coating with 10%（Ti +Ni/C） are higher than that of Al coating and substrate

confirming that the coating with 10%（Ti +Ni/C） has the best corrosion resistance.