| SHI Chun-yan,WANG Chun-xia,WU Guang-hui,TAN Xiao-sheng,HUANG Zhang-qi,ZHANG Yu-qing.Comparative Study on Properties of 2A12 Aluminum Alloy Hard Anodized Film by Roll Forming and Extrusion[J],48(3):178-184 |
| Comparative Study on Properties of 2A12 Aluminum Alloy Hard Anodized Film by Roll Forming and Extrusion |
| Received:July 25, 2018 Revised:March 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.025 |
| KeyWord:rolling and extrusion molding metallographic analysis hard anodic oxide film hardness corrosion resistance wear resistance |
| Author | Institution |
| SHI Chun-yan |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
| WANG Chun-xia |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
| WU Guang-hui |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
| TAN Xiao-sheng |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
| HUANG Zhang-qi |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
| ZHANG Yu-qing |
School of Materials Science and Engineering, Nanchang Aeronautical University, Nanchang , China |
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| Abstract: |
| The work aims to find out the reasons for the difference of film properties after hard anodic oxidation of aluminum alloy under the two forming ways by comparing the metallographic structure and composition of 2A12 aluminum alloy formed by rolling and extrusion. Keller reagent was used to corrode the substrate specimen, the corrosion morphology was observed by metallographic microscope and the structural differences were analyzed. Field emission electron microscope, energy spectrometer, microhardness tester, Tafel polarization curve and friction and wear tester were applied to analyze the organization structure, microstructure, composition, hardness, corrosion resistance and wear resistance of 2A12 aluminum alloy substrate formed by rolling and extrusion. The precipitated phase inside the extruded 2A12 aluminum alloy metallographic structure was broken to a large extent, and had a large number of micropores and residual pits due to the precipitated phase falling off. However, the rolled 2A12 aluminum alloy had a compact and flat structure, and the thickness of hard anodic oxide film was 66.03 μm, hardness was 457.26HV, roughness was 0.98 μm and abrasion loss was 0.0149 mg, which were respectively 4.11 μm higher than the thickness of the oxide film prepared by extrusion 2A12 aluminum alloy, 221.10 HV higher for the hardness, 0.94 μm lower for the roughness, and 0.7208 lower for the abrasion loss. 2A12 aluminum alloy formed by rolling has more uniform and compact internal structure, and low broken rate of precipitated phase. Under the same process conditions, the prepared hard anodic oxide film has better comprehensive performance. |
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