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Open AccessArticle

Investigation on Microstructure, Hardness, and Corrosion Resistance of Mo–Ni–B Coatings Prepared by Laser Cladding Technique

1
College of Mechanical Engineering, Donghua University, Shanghai 201620, China
2
Shanghai Development Research Center of Economy and Internatization, Shanghai 200020, China
3
Research Center of Advanced Textile Machinery, Ministry of Education, Donghua University, Shanghai 201620, China
4
Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(12), 856; https://doi.org/10.3390/coatings9120856
Received: 12 November 2019 / Revised: 2 December 2019 / Accepted: 11 December 2019 / Published: 13 December 2019
The hard and corrosion resistant coatings of Mo2NiB2 cermet were prepared by the laser cladding technique. The influences of the Mo:B ratio and the laser scanning speed on the microstructure and property of the Mo2NiB2 cermet coatings were investigated. The results showed that the laser scanning speed of 1.5 mm/s and the Mo:B ratio of 1 were more beneficial to the formation of Mo2NiB2 cermet than 2.0 mm/s and 0.8, 1.2, respectively. The amount of the Mo2NiB2 ceramic phases were decreased from the top layer to the bottom layer of the coating. The changes of microstructure and composition led to the changes of hardness and corrosion resistance of the Mo2NiB2 cermet coatings. The coating prepared at the Mo:B ratio of 1 and the scanning speed of 1.5 mm/s possessed the highest hardness, and the hardness gradually decreased from the top layer to the bottom layer of the coating. The formation of Mo2NiB2 and {FeM} phases led to the enhanced corrosion resistance of the Mo2NiB2 cermet coatings, and the coating prepared at the Mo:B ratio of 0.8 possessed the best corrosion resistance and the minimum corrosion current. View Full-Text
Keywords: laser cladding synthesis; Mo2NiB2 cermet coating; microstructure; hardness; corrosion resistance laser cladding synthesis; Mo2NiB2 cermet coating; microstructure; hardness; corrosion resistance
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Ni, X.; Wang, S.; Zhao, Y.; Li, W.; Jiao, X. Investigation on Microstructure, Hardness, and Corrosion Resistance of Mo–Ni–B Coatings Prepared by Laser Cladding Technique. Coatings 2019, 9, 856.

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