| QIAN Jian-cai,XU Bin,ZOU Hong-qing,WU Hou-chang,LYU Ji-cheng,FANG Min.Preparation and Properties of Hard Anodic Oxide Coating on 2A12 Aluminium Alloy[J],43(5):37-41 |
| Preparation and Properties of Hard Anodic Oxide Coating on 2A12 Aluminium Alloy |
| Received:April 20, 2014 Revised:May 28, 2014 |
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| DOI： |
| KeyWord:2A12 aluminum alloy hard anodizing corrosion resistance micro-hardness |
| Author | Institution |
| QIAN Jian-cai |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
| XU Bin |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
| ZOU Hong-qing |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
| WU Hou-chang |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
| LYU Ji-cheng |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
| FANG Min |
Weathering Test and Research Center of Science Technology and Industry for National Defense,Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Objective To study the properties of hard anodic oxide coatings on 2A12 aluminum alloy prepared in electrolyte of hybrid acids. Methods Hard anodic oxide coatings were prepared on 2A12 aluminum alloy surface in electrolyte of hybrid acids dominated by sulfuric acid. The effects of hybrid acids were analyzed and characterized. Results The results showed that the phenomenon of ablation could be avoided by the acts of H2SO4, organic acids and additive agents. The surface hardness of coating prepared in electrolyte of hybrid acids was above 400HV0. 05. Additive agent WX could increase the corrosion resistance of hard anodic oxide coatings on 2A12 aluminum alloy surface. Only 5% corrosion area of hard anodic oxide coating on 2A12 aluminum alloy surface was observed after 168 h of neutral salt spray test. Hard anodic oxide coatings on 7A04 aluminum alloy surface showed better corrosion resistance compared with the coatings on 2A12 aluminum alloy surface. Conclusion Aluminum alloys with lower Cu content are suggested for preparing hard anodic oxide coatings with better corrosion resistance. |
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