Friction and wear of a-C:H films deposited at different bias in air and NaCl solution. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Cong; Sui, Xudong; Lu, Xiaolong; Zhang, Xiao; Yan, Zhen; Lu, Yan; Hao, Junying
• Is Part Of: Tribology international. Volume 175(2022)
• Publication Date: 2022-11
• Subjects: A-C:H films -- Substrate bias voltage -- Friction -- Electrochemical corrosion; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2022.107863
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: a-C:H films were produced on 316 L stainless steel via magnetron sputtering technique. The effects of bias voltage on the composition, structure and properties of the films were studied. The sp 2 C fraction grows as the bias voltage increases, and the internal stress and hardness increase constantly. In ambient air, the films deposited at − 150 V have the lowest friction coefficient (COF) of 0.095, while those at − 30 V have the lowest COF of 0.028 in salt solution, benefiting from the higher H content. The corrosion resistance of the film is affected comprehensively by the thickness, surface morphology, sp 2 clusters and transition layer. The a-C:H film at − 60 V has the lowest corrosion current density (5.41 ×10 −11 A/cm 2 ) and the highest protection efficiency (99.8 %). Highlights: The microstructure and composition of the a-C:H films were tailored by the bias. The lowest friction coefficient in ambient air was 0.095 at the bias of − 150 V. The lowest average friction coefficient in saline environment was 0.028 at − 30 V. The anti-corrosion protection efficiency of the 316 L substrate achieved 99.8 % at − 60 V.