Microstructure, wear and corrosion performance of plasma electrolytic oxidation coatings formed on D16T Al alloy
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Microstructure, wear and corrosion performance of plasma electrolytic oxidation coatings formed on D16T Al alloy Wan-Ying Liu , Ying Liu* , Carsten Blawert, Mikhail-L. Zheludkevich, Chun-Ling Fan, Mohd Talha, Yuan-Hua Lin
Received: 11 August 2019 / Revised: 30 October 2019 / Accepted: 2 July 2020 / Published online: 14 September 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The plasma electrolytic oxidation (PEO) coatings were produced on D16T Al alloy in the aluminate and silicate electrolyte with and without graphene. The phase composition, microstructure and elemental distribution of the coatings were tested by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). The wear and corrosion resistance of PEO coatings were evaluated by dry sliding wear tests and electrochemical impedance spectroscopy (EIS). The morphology feature of the wear tracks was compared and analyzed by SEM and three-dimensional microscope. The results demonstrate that the structure, wear and corrosion resistance of PEO coatings with graphene are better than that of PEO coatings without graphene. The coating fabricated in the aluminate electrolyte with graphene exhibited the lowest roughness. The coated samples formed in silicate electrolyte with graphene displayed the thickest, densest and the most compact coating. It exhibited the best wear and corrosion resistance due to the incorporation
W.-Y. Liu, Y. Liu* College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China e-mail: [email protected] W.-Y. Liu, M. Talha, Y.-H. Lin School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China C. Blawert, M.-L. Zheludkevich Helmholtz-Zentrum Geesthacht Zentrum fu¨r Material-und Ku¨stenforschung GmbH, Institute of Materials Research, Geesthacht 21502, Germany C.-L. Fan Chongqing Xinyu Pressure Vessel Manufacturing Co., Ltd., Chongqing 402560, China
mode of graphene in the coatings. The mechanism of graphene improving the wear and corrosion resistance of PEO coating was further discussed. In summary, the comprehensive performances of PEO coatings formed in silicate electrolyte on D16T Al alloy are superior to that produced in aluminate electrolyte. Keywords PEO coatings; D16T Al alloy; Graphene; Wear; Corrosion
1 Introduction D16TAl alloy is an Al–Cu–Mg age hardening aluminum alloy with the characteristic of high strength and low density [1]. It is widely used in aerospace and other industrial applications. However, the shortcomings of low hardness, low wear resistance, high friction coefficient and low corrosion resistance in Cl- solution largely hinder the wide applications [2, 3]. Various surface treatments are used to widen the application of Al alloys. Hard anodizing is a conventional method. It can increase the load-bearing performance and improve the corrosion resistance of Al alloys. But, the coatings with low hardness and thicknes
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