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Open AccessArticle

Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

1
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
2
School of Materials Science and Engineering, Sichuan University, Chengdu 610065, China
3
Institute of Materials Research, Helmholtz Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(3), 249; https://doi.org/10.3390/coatings10030249
Received: 30 January 2020 / Revised: 29 February 2020 / Accepted: 4 March 2020 / Published: 8 March 2020
The effect of added graphene concentration on the microstructure, phase composition, corrosion- and wear- resistance of plasma electrolyte oxidation (PEO) coatings formed on D16T aluminum alloy in silicate electrolyte with different concentrations of graphene were investigated. The results show that the morphologies of the coatings with graphene were obviously different ascribed to the mode of graphene incorporated into the coating. The coatings consisted of mainly α-Al2O3, γ-Al2O3, and Al, which were divided into an outer porous layer and a dense inner layer. The thickness of the coatings increased non-linearly with graphene concentration. The corrosion resistance of the coatings with graphene was significantly improved. The wear resistance of the coatings was also greatly improved apart from the coating with 3 g/L graphene. The coating produced in the electrolyte with 2 g/L graphene exhibited the optimal comprehensive properties because graphene successfully incorporated into the coating via the pores and spread on the surface of the coating. View Full-Text
Keywords: aluminum alloy; wear; corrosion; plasma electrolytic oxidation aluminum alloy; wear; corrosion; plasma electrolytic oxidation
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Liu, W.; Pu, Y.; Liao, H.; Lin, Y.; He, W. Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene. Coatings 2020, 10, 249.

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