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Effect of Cr Content on Corrosion Resistance of Ni–xCr–Mo Laser-Cladding Coatings under $H_{2}$S-Induced High-Temperature Corrosion Atmosphere
Content Provider | MDPI |
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Author | Liu, Congcong Liu, Zongde Gao, Yuan Wang, Xinyu Zheng, Chao |
Copyright Year | 2022 |
Description | Ni–xCr–Mo laser-cladding coatings with varying Cr content of 10, 15, 20, 25, and 30 wt.% were fabricated using a self-assembled coaxial laser-cladding device. The $H_{2}$S-induced high-temperature corrosion tests under reductive atmosphere were conducted at 500, 550, and 600 °C. Subsequently, the influence of Cr content on the microstructural evolution and corrosion resistance of the Ni–xCr–Mo coatings was investigated. The experimental results revealed that 30 wt.% Cr is the limited maximum content that forms the suitable morphology of coatings without large prominent pores and cracks during the fabrication process, and 15 wt.% Cr corresponds to the critical minimum content for excellent corrosion resistance, as implied from the variation tendency of the corrosion weight-gain curves. Moreover, a two-layer structure of the corrosion scales was observed in the Ni–xCr–Mo laser-cladding coatings, which was primarily caused by the selective corrosion between the Ni and S and Cr/Mo and O. |
Starting Page | 1885 |
e-ISSN | 19961944 |
DOI | 10.3390/ma15051885 |
Journal | Materials |
Issue Number | 5 |
Volume Number | 15 |
Language | English |
Publisher | MDPI |
Publisher Date | 2022-03-03 |
Access Restriction | Open |
Subject Keyword | Materials Coatings and Films Ni–cr–mo High-temperature Corrosion H2s Laser Cladding |
Content Type | Text |
Resource Type | Article |