Probing Tribological Behaviors of Cr-DLC in Corrosion Solution by Tailoring Sliding Interface
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ORIGINAL PAPER
Probing Tribological Behaviors of Cr‑DLC in Corrosion Solution by Tailoring Sliding Interface Jian Wu1,2 · Guizhi Wu1 · Xinli Kou2 · Zhibin Lu1 · Guangan Zhang1 · Zhiguo Wu3 Received: 3 April 2020 / Accepted: 18 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Friction pairs are regarded significantly as one unified system to avert excessive energy and material loss caused by friction in harsh environment taking into account of its complicated physical and chemical process in the friction interface. Here, we carried out the experiment of Cr-doped diamond-like carbon (Cr-DLC) sliding against different counterparts in hydrochloric acid (HCl) in order to find a better solution for the tribocorrosion failure of Cr-DLC in harsh environment. The results indicated that the material of counterparts and interfacial tribochemical products had significant impact on the friction behavior of Cr-DLC. The friction coefficients of Cr-DLC sliding against different counterparts were highly dependent with the associated Hertzian contact radius calculated by the Hertzian contact theory, while the wear rates were related to the interfacial tribochemical products in HCl. Moreover, the hardness ratio and the elastic energy density of friction pair were introduced to analysis the wear behavior of Cr-DLC film sliding against mated materials. All of the results indicated that the Cr-DLC film sliding against tetrahedral amorphous carbon (ta-C) showed the most outstanding tribological performance. Understanding the fundamental mechanism of Cr-DLC film sliding against different counterpart materials would expand the practical application of Cr-DLC thin film in corrosive environment. Graphical Abstract
Keywords Diamond-like carbon · Counterpart materials · Friction · Corrosion solution
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1 Introduction For decades, tribocorrosion is becoming more attractive to reduce material and energy loss of mechanical components under severe working conditions, such as marine industry, petrochemical engineering, textile industry, and offshore wind power engineering [1–4]. In this context, it is extremely important to enhance the long-term durability of frictional components in mechanical systems since they often go through pitting, scuffing, spalling, and corrosion-failure wear in harsh environment [5]. Minimizing corrosion and wear out failure is still a big challenge for mechanical components in nowadays [6–8]. Most popular methods of eliminating tribocorrosion involve the fabrication of various solid lubrication film on the workpiece surface. Among these films, diamond-like carbon (DLC) and tetrahedral amorphous carbon (ta-C) film demonstrated the potential use in harsh condition. DLC is a series of metastable disordered carbon with a mixture of sp2 and sp3 hybridization, and ta-C is a type of DLC having a higher content of sp3 carbon bonding than others [9–11]. DLC films have
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