Mo

2

NiB

2

based cermet coating was prepared on the surface of Q235 low carbon steel by atmospheric plasma spraying

and laser remelting was carried out at 300 W and 500 W power. The results show that the laser remelting method can significantly reduce the defects of the coating

make the microstructure more dense

and the weak mechanical bonding at the interface is transformed into a good metallurgical bonding. With the increase of laser power

the bonding strength and corrosion resistance of the coating are improved

the maximum bonding strength is 38.08 MPa

and the minimum corrosion current is 0.033 μA/cm

2

; But the hardness and

wear resistance are reduced

the minimum hardness is 1781HV

0.2

and the maximum volume friction rate is 6.25×10

–5

mm

3

/(N·m). The hardness

bonding strength

wear resistance and corrosion resistance of the above plasma sprayed and two kinds of laser remelted Mo

2

NiB

2

based cermet coatings were significantly higher than those of Q235 low carbon steel substrate.