Friction, DOI:10.1007/s40544-021-0559-4 (2022) [pdf]

Long-term Tribocorrosion Resistance and Failure Tolerable of Multilayer Carbon-based Coatings

Hao Li, Linlin Liu, Peng Guo, Lili Sun, Jing Wei, Yingrui Liu, Shuyu Li, Shuyuan Wang, Kwang-Ryeol Lee, Peiling Ke, Aiying Wang
 

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, TiC_x/DLC, and Ti-TiC_x/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, TiC_x/DLC exhibited the best tribocorrosion resistance owing to its high hardness. During the long-term tribocorrosion test, however, Ti-TiC_x/DLC coating indicated the best anti-tribocorrosion performance owing to its excellent fracture toughness together with high hardness. Moreover, under 5 N, Ti-TiC_x/DLC can withstand a long-term test of more than 24 h. Additionally, under a higher load of 20 N, the Ti-TiC_x/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 Fe_xO_y.