Effect of Fe content on microstructure and corrosion resistance of Ni-based alloy formed by laser cladding

Fe content has a dramatic effect on the properties of laser cladding Ni60 coatings, but there is a lack of in-depth research at present. In this article, Ni60 coatings with different Fe content were prepared on Q235 substrate by laser cladding technology. The microstructure, phases, and electrochemical corrosion resistance were explored detailed. With the increase of Fe content, the phases of the coating changes from ellipsoidal γ-FCC+ massive chromium-rich phase + γ-FCC/(Ni 3 B + Ni 3 Si) ternary eutectics to γ-FCC/(Cr, Fe) 7 C 3 eutectics. The massive hard phases in the coating almost disappeared and the distribution of Cr in the coating becomes more uniform. The corrosion resistance becomes worse at first and then improves significantly. When the Fe content reaches to 25 wt%, the coating exhibits excellent corrosion resistance almost comparable to that of Ni60AA, which provides a new path for the low-cost application of Ni60 series coatings at abrasive occasions. • With the increase of Fe content, the massive hard phases in the coating almost disappeared and the distribution of Cr in the coating becomes more uniform • The corrosion resistance of the coating decreases first and then increases with the increase of Fe content • A coating with excellent corrosion resistance and low cost is obtained