Corrosion Behavior of Laser-clad Mo₂NiB₂ Cermet Coating on Low Carbon Steel Substrate

Abstract

A Mo 2 NiB 2 cermet coating on low carbon steel substrate was fabricated by laser cladding technique. The coating consisted of γ -(Fe, Ni) as a metallic matrix binder and Mo 2 NiB 2 particles as a reinforced phase distributed uniformly in the microstructure. Corrosion behavior of the coating was investigated and the commercial 1Cr, 304SS, and G3 were used for comparison. G3 exhibited the highest corrosion resistance and 1Cr the lowest corrosion resistance, whereas 304SS and the coating exhibited the intermediate and similar corrosion resistance. However, the severe pitting corrosion which was observed in 304SS did not exist for the coating.