Microtribological properties of Ti6Al4V alloy treated with self-assembled dopamine and graphene oxide coatings. (September 2019)

• Record Type: Journal Article
• Authors: Wang, Chenchen; Zhang, Gangqiang; Li, Zhipeng; Xu, Yong; Zeng, Xiangqiong; Zhao, Shichang; Deng, Jun; Hu, Hongxing; Zhang, Yadong; Ren, Tianhui
• Is Part Of: Tribology international. Volume 137(2019)
• Page Start: 46
• Page End: 58
• Publication Date: 2019-09
• Subjects: Ti–6Al–4V -- GO coatings -- Anticorrosion -- Microtribology; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.04.030
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Ti6Al4V alloy is promising material as biomedical micro/nano–electromechanical systems. However, its poor microtribological properties have a negative impact on the micromachine stability. In this study, enhancements in anticorrosion and microtribological performances under dry and SBF lubrication are realized by grafting graphene oxide (GO) on the alloy surface. We further demonstrate that based on a 3-aminopropyltriethoxysilane (APTES) transition layer, the GO-coated sample with dopamine (DA) adhesive layer (APTES-DA-GO) exhibits better properties than those of the APTES-GO. Moreover, the anticorrosion and tribological mechanisms of the GO-coated samples were discussed. Analyses of worn surfaces show that the relative slip of GO sheets and entrapment of wear particles of the surface topography are the main factors contributing to the improved tribological behaviour. Graphical abstract: Image 1 Highlights: Multilayer graphene oxide (GO) coatings are assembled on the Ti6Al4V alloys. Dopamine is selected as the adhesive layer in the self-assembly technology. Ti6Al4V coated GOs have better anti-corrosion and micro-tribological properties. The anti-corrosion and micro-tribological mechanisms were both discussed. Other novel materials will be prepared using the self-assembly method in future.