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Frontiers of Chemical Science and Engineering

Front. Chem. Sci. Eng.    2020, Vol. 14 Issue (6) : 1065-1071
Effect of electrolyte concentration on the tribological performance of MAO coatings on aluminum alloys
Chao Wang1(), Jun Chen1,2, Jihua He1, Jing Jiang1, Qinyong Zhang2
1. Clean Energy Materials and Engineering Center, State Key Laboratory of Electronic Thin Film and Integrated Device, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2. School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
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Micro-arc oxidation (MAO) is an efficient approach to improve the hardness, wear resistance, and other properties of aluminum alloys. In order to investigate the effect of the electrolyte concentration on the properties of MAO coatings for LY12 alloy, the voltage variation during the MAO process was recorded. The surface morphologies and phase compositions of the coatings produced with different electrolytes were investigated using scanning electron microscopy and X-ray diffraction, respectively. The roughness and thickness of the coatings were measured using a pocket roughness meter and an eddy-current thickness meter, respectively. The tribological performances of the coatings were investigated against GCr15 bearing steel on a ball-on-disc wear tester in open air. The results showed that with an increase in the Na2SiO3 content, the working voltage of the MAO process decreased, the roughness and thickness of the coatings increased significantly, and the relative content of the α-Al2O3 phase decreased. With an increase in the KOH content, the working voltage decreased slightly, the roughness and thickness of the coatings increased slightly, and the α- and γ-Al2O3 phase contents remained unchanged. The friction coefficient and wear rate of the coatings increased with an increase in the Na2SiO3 and KOH concentrations. A decrease in the porosity and roughness and an increase in the α-Al2O3 content of the coatings reduced their wear mass loss.

Keywords aluminum alloy      micro-arc oxidation      coating      electrolyte concentration      tribological performance     
Corresponding Author(s): Chao Wang   
Just Accepted Date: 10 January 2020   Online First Date: 13 March 2020    Issue Date: 11 September 2020
 Cite this article:   
Chao Wang,Jun Chen,Jihua He, et al. Effect of electrolyte concentration on the tribological performance of MAO coatings on aluminum alloys[J]. Front. Chem. Sci. Eng., 2020, 14(6): 1065-1071.
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Chao Wang
Jun Chen
Jihua He
Jing Jiang
Qinyong Zhang
Specimens S1 S2 S3 S4 S5
Concentrations of Na2SiO3/(g?L?1) 5 10 15 5 5
Concentrations of KOH/(g?L?1) 0.5 0.5 0.5 1.0 1.5
Tab.1  MAO coatings formed using electrolytes with different concentrations of Na2SiO3 and KOH
Fig.1  Voltage-time responses of the coatings prepared using the electrolytes with different concentrations of (a) Na2SiO3 and (b) KOH.
Fig.2  Surface micrographs of the MAO coatings formed using the electrolytes with different concentrations of Na2SiO3 and KOH: (a) S1, (b) S2, (c) S3, (d) S4, (e) S5 and (f) the EDS mapping of S3.
Specimens S1 S2 S3 S4 S5
Ra/mm 1.56 2.73 3.94 1.94 2.57
Tab.2  Roughness of the MAO coatings
Fig.3  X-ray diffraction patterns of the coatings prepared using the electrolytes with different concentrations of (a) Na2SiO3 and (b) KOH.
Fig.4  Thickness of the MAO coatings formed using the electrolytes with different concentrations of Na2SiO3 and KOH.
Fig.5  Friction coefficients of the MAO coatings formed using the electrolytes with different concentrations of (a) Na2SiO3 and (b) KOH.
Specimens S1 S2 S3 S4 S5 Al substrate
Wear mass loss/mg 0.1 0.3 0.4 0.3 0.5 3.2
Tab.3  Wear mass loss of the coatings
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