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Sliding wear behaviour and microstructure of PEO coatings formed on aluminium alloy |
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| Authors: | J. J. Zhuang Y. Q. Guo N. Xiang X. Y. Lu Q. Hu |
| Affiliation: | 1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China;3. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China;4. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China |
| Abstract: | In this work, plasma electrolytic oxidation coating was formed on aluminium alloy in a cheap and inexpensive electrolyte to improve its wear resistance. It was found the micro-hardness of coatings increased first and then decreased with increasing the oxidised time. It was showed that the specimen treated under the time of 35 minutes exhibited the highest micro-hardness and lowest wear loss. The surface and cross-sectional morphology indicated that the coatings have a dense structure with low porosity. The presence of wear scars on the worn surface morphology demonstrates that the three-body rolling was the main wear mechanism for coated specimen. X-ray diffraction results showed the coating was formed mainly from α-Al2O3 and γ-Al2O3. |
| Keywords: | Plasma electrolytic oxidation Aluminium alloy Microstructure Wear test Friction coefficient |