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Abstract
Current tribocorrosion research of metallic materials and their surface protective coatings mainly focuses on their short-term properties, with test time of 0.5–2.0 h and a sliding distance 50–500 m, which may significantly deviate from the practical long-term service condition and thus cause a catastrophe of marine equipments. In this study, three carbon-based multilayer coatings (Ti/DLC, TiCx/DLC, and Ti—TiCx/DLC) were deposited on S32750 substrates, and both short-term and long-term tribocorrosion behaviors were investigated. The experimental results indicate that the coatings substantially improve the tribocorrosion resistance of the S32750 stainless steel. During the short-term tribocorrosion test, TiCx/DLC exhibited the best tribocorrosion resistance owing to its high hardness. During the long-term tribocorrosion test, however, Ti—TiCx/DLC coating indicated the best anti-tribocorrosion performance owing to its excellent fracture toughness together with high hardness. Moreover, under 5 N, Ti—TiCx/DLC can withstand a long-term test of more than 24 h. Additionally, under a higher load of 20 N, the Ti—TiCx/DLC with a corresponding sliding distance of approximately 1,728 m maintained a low friction coefficient of approximately 0.06. However, the coating was completely worn out; this is attributable to the formation of tribocorrosion products consisting of graphitized carbon and nanocrystalline FexOy.
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Details
1 Chinese Academy of Sciences, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Ningbo, China (GRID:grid.9227.e) (ISNI:0000000119573309); University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419)
2 Chinese Academy of Sciences, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Ningbo, China (GRID:grid.9227.e) (ISNI:0000000119573309)
3 Chinese Academy of Sciences, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Ningbo, China (GRID:grid.9227.e) (ISNI:0000000119573309); Korea Institute of Science and Technology, Computational Science Center, Seoul, Republic of Korea (GRID:grid.35541.36) (ISNI:0000000121053345)