Different γ-Ni/Mo 2 Ni 3 Si alloy coatings were fabricated on 0.45 wt-% C steel applying the DISTA300 semiconductor laser system. The microstructures, phase components and corrosion behaviour of the alloy coatings were investigated. Research results showed that lasercladded coatings with different compositions were all composed of ductile phase γ-Ni and reinforced phase Mo 2 Ni 3 Si. Electrochemical parameters and anodic polarisation curves revealed that the γ-Ni/Mo 2 Ni 3 Si alloy coatings exhibited a good corrosion performance in 3.5% NaCl solution in comparison with 0Cr18Ni9Ti stainless steel. The corrosion current density of the laser-cladded layer increased first and then decreased with the increasing volume fraction of Mo 2 Ni 3 Si. Moreover, the addition of Cr can significantly improve the passivation and anti-pitting ability of the γ-Ni/Mo 2 Ni 3 Si alloy coating.