Dry Sliding Wear Properties and Microstructure of 7075 Aluminum Alloy via Plasma Electrolytic Oxidation

SHI Yuan-ji, LI Jun-wan, GUO Xun-zhong, YU Lin-hui, LI Shuang, HUANG Hao

doi:10.16577/j.cnki.42-1215/tb.2021.01.021

Materials Protection >

2021 , Vol. 54 >Issue 1: 121 - 126

DOI: https://doi.org/10.16577/j.cnki.42-1215/tb.2021.01.021

Dry Sliding Wear Properties and Microstructure of 7075 Aluminum Alloy via Plasma Electrolytic Oxidation

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(1.School of Mechanical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210046, China;2.College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3.School of Materials Science and Engineering,Shanghai University, Shanghai 200072, China;4.Department of Scientific Research, Hebei college of industry and Technology, Shijiazhuang 050091, China)

Received date: 2020-07-19

Online published: 2025-07-09

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Abstract

In this paper, 7075 aluminum alloy were treated in silicate-borate based electrolyte via plasma electrolytic oxidation(PEO), employing a pulsed constant voltage power mode to improve the surface quality and surface properties of 7075 aluminum alloy.The effects of electrical parameter(duty cycle)on morphology and wearing behavior of the PEO coatings were thoroughly investigated.The surface and cross section morphology of the coatings was observed by scanning electron microscope.Besides, the wearing properties of the coatings were evaluated by the wearing experiment.Results showed that the microhardness and the wearing resistance of the coatings both first increased and then decreased with the increase of duty cycle.Composition analysis proved the coating was composed of α-Al2O3 and γ-Al2O3.

Key words： 7075 aluminum alloy; plasma electrolytic oxidation; PEO coating; duty cycle; microstructure; wearing test; friction coefficient

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SHI Yuan-ji, LI Jun-wan, GUO Xun-zhong, YU Lin-hui, LI Shuang, HUANG Hao . Dry Sliding Wear Properties and Microstructure of 7075 Aluminum Alloy via Plasma Electrolytic Oxidation[J]. Materials Protection, 2021 , 54(1) : 121 -126 . DOI: 10.16577/j.cnki.42-1215/tb.2021.01.021

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