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
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.
. [J]. Frontiers of Chemical Science and Engineering, 2020, 14(6): 1065-1071.
Chao Wang, Jun Chen, Jihua He, Jing Jiang, Qinyong Zhang. Effect of electrolyte concentration on the tribological performance of MAO coatings on aluminum alloys. Front. Chem. Sci. Eng., 2020, 14(6): 1065-1071.
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