Tribocorrosion properties of AISI 1045 and AISI 2205 steels in seawater: Synergistic interactions of wear and corrosion
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
Tribocorrosion properties of AISI 1045 and AISI 2205 steels in seawater: Synergistic interactions of wear and corrosion Beibei ZHANG1, Jianzhang WANG1, Hao LIU1, Yunfeng YAN1,2, Pengfei JIANG1, Fengyuan YAN1, 1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou
730000, China 2
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049,
China Received: 08 May 2019 / Revised: 19 October 2019 / Accepted: 24 February 2020
© The author(s) 2020. Abstract: Tribocorrosion denotes an irreversible material degradation for several metallic components used in corrosive environments, and it arises from the interplay between chemical, mechanical, and electrochemical processes. In this study, some investigation has been performed to compare the tribocorrosion behavior of AISI 1045 steel and AISI 2205 duplex stainless steel sliding against an alumina pin in seawater. The lowering in the open circuit potential (OCP) of AISI 2205 during the tribocorrosion demonstrates that its protective passive film was damaged by wear and resulted in a wear-accelerated corrosion in the wear track. However, sliding was found to accelerate the corrosion of the unworn areas for AISI 1045, leading to an anodic shift of the OCP. Moreover, the total material loss increased with an increase in the applied potential for both materials. It was revealed that AISI 1045 was more sensitive to corrosion under sliding than AISI 2205. Therefore, pure corrosion loss and corrosion-induced wear constituted the primary reasons for the degradation of AISI 1045 at applied anodic potentials. Keywords: tribocorrosion; passivation; synergistic effect; seawater
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Introduction
Metallic materials are extensively used in corrosive environments owing to their ability to form protective passive film. However, in the practical engineering applications, e.g., stern tube bearings and offshore platforms, these passive metals often undergo tribological contacts, which will damage or even remove their protective oxide film exposing the underlying fresh bulk material to the surrounding corrosive environment [1−4]. Therefore, the metals are subjected to accelerated material loss through a combined influence of mechanical and electrochemical damage. Owing to the coupling of mechanical loading and corrosive attack by the environment,
this tribocorrosion behavior of material might not be predicted separately based on wear or corrosion. This indicates that the total material loss caused by tribocorrosion is often significantly higher than the degradation by the individual processes. Therefore, the synergistic effect between wear and corrosion usually plays an important role in material failure, which poses a high potential safety risk and generates huge economic losses [5−7]. The use of stainless steels is prevailing in harsh environments owing to its good mechanical properties and high corrosion resistance
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