| LIU Wan-ying,LIU Ying,CHEN Long,LIN Yuan-hua,SHI Yun-sheng,GAO Ting-yan,QIU Yu-hong.Effect of Graphene Nanosheets on Structure and Properties of Micro-arc Oxide Films Formed on D16T Aluminum Alloy[J],49(5):237-250 |
| Effect of Graphene Nanosheets on Structure and Properties of Micro-arc Oxide Films Formed on D16T Aluminum Alloy |
| Received:July 05, 2019 Revised:May 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.05.029 |
| KeyWord:D16T aluminum alloy micro-arc oxidation graphene nanosheets corrosion resistance wear resistance |
| Author | Institution |
| LIU Wan-ying |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China; 2.School of Materials Science and Engineering, Sichuan University, Chengdu , China |
| LIU Ying |
2.School of Materials Science and Engineering, Sichuan University, Chengdu , China |
| CHEN Long |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| LIN Yuan-hua |
1.a.School of Materials Science and Engineering, b.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| SHI Yun-sheng |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| GAO Ting-yan |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| QIU Yu-hong |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| The work aims to study effect of graphene on the wear and corrosion resistance of D16T aluminum alloy was studied, which provided a theoretical basis for the application of micro-arc oxidation treatment technology on the surface of aluminum alloy used in oil and gas field. The micro-arc oxidation films were prepared on the surface of D16T aluminum alloy in the electrolyte with and without grapheme by micro-arc oxidation technology. The phase structure and surface morphology of the films were analyzed by XRD, SEM and EDS. The roughness and micro-hardness of the films were tested. Effects of graphene nanosheets on the wear and corrosion resistance of D16T aluminum alloy MAO films were investigated by wear and chemical experiments. The micro-arc oxidation coating is mainly composed of α-Al2O3 and γ-Al2O3 phases. The diffraction peak and peak number of Al2O3 phase obviously increase and the diffraction peak of Al decreases significantly due to the addition of graphene nanosheets. The surface of the film is flat and the molten particles on the surface are less. A large number of agglomerates are accumulated. The film is consistent of an outer loose layer and an inner dense layer. The number of the micropores and microcracks in the loose layer are less, and the thickness of the films lightly increases. The thickness of the dense layer increases from 0.6 μm thickness of the coating without graphene nanosheets to 1.6 μm. The resistive arc radius of the film with graphene nanosheets is obviously increased. The low-frequency impedance value in the Bode diagram increased from 5′105 Ω×cm2 to 106 Ω×cm2. The resistance of the loose layer increased from 1.57′105 Ω×cm2 to 1.98′105 Ω×cm2, and the resistance of the dense layer increased from 3.07′105 Ω×cm2 to 1.24′106 Ω×cm2. The self-corrosion potential of the film increased from -0.53 V to -0.41 V, and the self-corrosion current density reduced from 3.15′10-7 A/cm2 to 3.97′10-8 A/cm2. The wear amount of the film quality is significantly reduced. The friction coefficient of the film is reduced, and the wear resistance is improved. Graphene nanosheets entered into the coating through the discharge channel and filled the holes and cracks in the coating. Parts of the graphene nanosheets formed a cluster and covered the surface of the coating. That made the coatings moother and denser, and the thickness of the film was increased, and the wear resistance and corrosion resistance of the film were significantly improved. |
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