Tailoring the corrosion and tribological performance of Ti-modified MoS2-based films in simulated seawater
Xiangru Shi, Peihua He, Shangqi Sun, Jian Chen, Ben D. Beake, Tomasz Liśkiewicz, Xin Zhang, Zehua Zhou
Abstract
Film protection has become a crucial means to improve the corrosion and wear performance of key components in aggressive environment. In this study, the feasibility of using MoS 2 -based modified films in artificial seawater (3.5% NaCl solution) was evaluated by co-deposition of Ti to produce Ti–MoS 2 composite and Ti/MoS 2 multilayer films . The microstructure, wettability , mechanical, tribological and corrosion behavior of the Ti-modified MoS 2 -based films was contrasted to pure MoS 2 film. The results show that the incorporation of Ti not only improves densification, but also promotes a transformation from a columnar to an amorphous film structure, leading to the improvement of mechanical properties of Ti–MoS 2 composite film and Ti/MoS 2 multilayer film. The friction coefficient curves of all of the three MoS 2 -based film in 3.5 wt% NaCl solution show stable values during the sliding process. The advantage of the preferential (002) growth orientation, improved mechanical properties and reduced hydrophobicity for both of the Ti-modified MoS 2 films caused the decreased friction coefficient and wear rate in NaCl solution. The electrochemical results before and after friction show that the ranking of corrosion resistance is Ti/MoS 2 multilayer > Ti–MoS 2 composite film > pure MoS 2 film, which is attributed to the compact microstructure and the presence of surface passive films.