Novel laser cladding FeCoNiCrNb0.5Mox high-entropy alloy coatings with excellent corrosion resistance

Abstract

In order to improve the properties of the surface corrosion resistance of the load bearing parts of marine equipment in the high salt and high humid environment, novel FeCoNiCrNb0.5Mox (x = 0.00, 0.25, 0.50, 0.75, 1.00) high-entropy alloy coatings were prepared on the 42CrMo steel by laser cladding. The testing results show that the FeCoNiCrNb0.5Mox coatings consist of FCC phase and Laves phase, and the increase of Mo content promotes the formation of the Laves phase. FeCoNiCrNb0.5Mo0.50, FeCoNiCrNb0.5Mo0.75 and FeCoNiCrNb0.5Mo1.00 coatings have complete eutectic structure. The appropriate addition of Mo improves corrosion resistance by promoting the formation of Laves phase. Mo0.75 coating possesses the best corrosion resistance property. Compared with the substrate of the 42CrMo steel, the FeCoNiCrNb0.5Mox coatings possess much better corrosion resistance, which means that they are promising materials for surface protection of marine engineering equipment.