| WANG Ping,CAO Wen-jie,PU Jun,GONG Ze-yu,HU Jie,XIAO You-tao.Effects of SiC Micro-particles Additives on Properties of Micro-arc Oxidation Coatings on Aluminum Alloy Drill Pipe Material[J],47(6):63-67 |
| Effects of SiC Micro-particles Additives on Properties of Micro-arc Oxidation Coatings on Aluminum Alloy Drill Pipe Material |
| Received:December 19, 2017 Revised:June 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.010 |
| KeyWord:micro-arc oxidation aluminum alloy drill pipe microstructure SiC micro-particles corrosion resistance reaction mechanism |
| Author | Institution |
| WANG Ping |
Southwest Petroleum University, Chengdu , China |
| CAO Wen-jie |
Southwest Petroleum University, Chengdu , China |
| PU Jun |
Southwest Petroleum University, Chengdu , China |
| GONG Ze-yu |
Southwest Petroleum University, Chengdu , China |
| HU Jie |
Southwest Petroleum University, Chengdu , China |
| XIAO You-tao |
Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| The work aims to improve properties of micro-arc oxidation (MAO) coatings on aluminum alloy drill pipe material. Micro-arc oxidation (MAO) coatings on 7E04 aluminum alloy drill pipe material were modified by adding 0 to 4 g/L SiC micro-particles in electrolytes. Oxidation voltage-time curve, thickness, microhardness, surface morphology, content of coating element, phase composition and corrosion resistance of the MAO coatings were studied. With the increase of SiC micro-particle concentration (0, 1, 2, 3, 4 g/L), oxidation voltage rose gradually and nearly reached 550 V at the concentration of 4 g/L. The thickness and microhardness of MAO coatings increased along with oxidation voltage. Thickness of the MAO coatings at each concentration was 42.3, 43.6, 45.0, 45.3 and 50.0 μm, respectively, and microhardness of the coatings were 341.8, 375.2, 394.4, 405.1, 436.8 MPa, respectively. Meanwhile, diameter of discharge pore and size of sintered disc also increased gradually. In the MAO process, SiC was oxidized into SiO2, Al in the substrate was oxidized into α- Al2O3 and γ- Al2O3, and the MAO coatings were mainly composed of α-Al2O3, γ- Al2O3, SiO2 and mullite phase. In the meantime, as SiC micro-particle concentration increased, the content of C and Si rose, while the content of O and Al decreased. Corrosion rate of the coatings was 1.11×10−1, 3.598×10−2, 5.223×10−2, 6.762×10−2, 1.323×10−1 mm/a, respectively, the corrosion rate first dropped and then increased, while corrosion resistance first increased and then dropped. The addition of SiC micro-particle has increased thickness of coatings, changed surface morphology of coatings, and enhanced properties (such as microhardness and corrosion resistance) of MAO coatings. |
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