| HUANG Li-bao,HAO Jian-min,ZHANG Bin-ying,MA Jian-ji.Wear Properties of Microarc Oxidation Coating of 2A12 Aluminum Alloy in Two Systems[J],49(5):185-190 |
| Wear Properties of Microarc Oxidation Coating of 2A12 Aluminum Alloy in Two Systems |
| Received:August 29, 2019 Revised:May 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.05.022 |
| KeyWord:aluminum alloy micro-arc oxidation zirconium salt phosphate wear resistance |
| Author | Institution |
| HUANG Li-bao |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| HAO Jian-min |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| ZHANG Bin-ying |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| MA Jian-ji |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
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| Abstract: |
| The work aims to compare the wear properties of micro-arc oxidation (MAO) coating of aluminum alloy in two solution systems. In this paper, MAO coatings on 2A12 aluminum alloy were prepared by MAO technology. The morphology, thickness, phase composition, hardness and wear properties of the MAO coatings were investigated by means of Scanning Electron Microscope (SEM), X-ray Diffraction Spectrometer (XRD), Vicker hardness tester and friction tester respectively. The results showed that the growth rate of coating in zircon salt system is higher than that in phosphate system. The hardnesses of zircon salt and phosphate were 1050HV and 1250HV, respectively. The coating of zircon salt system is mainly composed of α-Al2O3, γ-Al2O3, c-ZrO2 and t-ZrO2 phases. The coating of phosphate system coating is composed by α-Al2O3 and γ-Al2O3 phases. In the zircon salt system, the friction coefficient of the coating under the voltage of 450 V and 500 V are 0.425 and 0.375 respectively. In the phosphate system, the friction coefficient of the coating under the voltage of 450 V and 500 V are 0.328 and 0.325 respectively. The friction coefficient of zircon salt coating is higher than that of phosphate coating. During the wear process, the friction auxiliary material GCr15 is filled into the pits of the coating. Under high voltage, the coating in two solution system exhibits a smaller coefficient of friction. The initial stage of wear is abrasive wear and the stable stage is adhesive wear. |
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