Structure and tribocorrosion behavior of CrMoSiCN nanocomposite coating with low C content in artificial seawater
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
Structure and tribocorrosion behavior of CrMoSiCN nanocomposite coating with low C content in artificial seawater Yongqiang FU1, Fei ZHOU1,*, Maoda ZHANG1, Qianzhi WANG1, Zhifeng ZHOU2 1.
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2.
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Received: 05 July 2020 / Revised: 07 August 2020 / Accepted: 18 August 2020
© The author(s) 2020. Abstract: CrMoSiCN nanocomposite coatings with a low C content were prepared on Ti−6Al−4V using an unbalanced magnetron sputtering system, and their corresponding microstructures, mechanical properties, and tribocorrosion performance were evaluated in detail. The results revealed that the CrMoSiCN coating had a compact nanocomposite microstructure consisting of CrN and Mo2N nanocrystallites, (Cr, Mo)N solid solution, and Si−C−N amorphous phases. Moreover, the coating exhibited superior mechanical properties with a hardness of 28.6 GPa and an elastic modulus of 273 GPa, owing to the solid solution strengthening effect. The tribocorrosion test results showed that the dominant failure of the Ti−6Al−4V alloy was caused by the corrosion contribution to wear behaviors (synergistic effect). The CrMoSiCN nanocomposite coating could effectively alleviate the material loss caused by the synergistic effect of corrosion and wear behaviors, leading to pure wear behaviors during the entire tribocorrosion process. The corresponding tribocorrosion mechanisms under the open circuit potential and dynamic polarization conditions were discussed in terms of their tribocorrosion behaviors. Keywords: CrMoSiCN coating; microstructure; mechanical properties; tribocorrosion; seawater
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Introduction
With the rapid pace of marine resource exploration, the requirements for the quality of marine equipment are becoming more stringent. Currently, the most challenging limitation of marine equipment is that its metal components experience friction, wear, and erosion simultaneously in a strongly corrosive marine environment, which leads to the premature failure of these components. The service life and reliability of marine equipment primarily depend on the wear and corrosion performance of the components in seawater [1, 2]. Thus, the ideal solution is to protect the component surface using hard coatings with favorable * Corresponding author: Fei ZHOU, E-mail: [email protected]
wear-resistant and anti-corrosion properties [3]. Among hard coatings, CrN-based coatings have attracted the most attention over the past decades [4−10]. However, there are two points that limit the development of CrN-based coatings: the first is that a single-component coating can no longer meet practical requirements, and the second point is that the traditional test methods cannot simulate real working conditions. For the first point, our previous research showed that the tribological performance of a
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