| QIAN Jian-cai,ZOU Hong-qing,XU Bin,WU Hou-chang,LYU Ji-cheng,FANG Min.Influence of Electrolyte on the Properties of Hard Anodic Oxide Coating on 2A12 Aluminium Alloy[J],44(11):40-45 |
| Influence of Electrolyte on the Properties of Hard Anodic Oxide Coating on 2A12 Aluminium Alloy |
| Received:August 06, 2015 Revised:November 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.11.007 |
| KeyWord:2A12 Aluminium alloy hard anodic oxide micro-hardness corrosion resistance polarization curve AC-impe-dance |
| 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 |
| ZOU Hong-qing |
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 |
| 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 oxidation coatings on 2A12 aluminum alloy prepared in the electrolyte of sulphuric acids and hybrid acids separately,in order to find out the influencing mechanism of hybrid acids on hard anodic oxidation process of 2A12 aluminum alloy, and provide method to enhance the coating corrosion resistance. Methods The properties of hard anodic oxide coatings prepared in different electrolytes were analyzed and characterized by thickness, micro-hardness, SEM morphology, polarization curve and AC impedance spectroscopic to investigate the influence of different electrolytes on the performance of hard anodic oxidation coatings on 2A12 aluminum alloy. Results The phenomenon of hard anodic oxide coatings on 2A12 aluminum alloy prepared in electrolyte of sulphuric acids such as ablation, non-uniform distribution of thickness and micro-hardness can be resolved by active adsorption of organic acids in electrolyte of hybrid acids, and the thickness distribution range was 35 ~38 μm, the micro-hardness distribution range was 386 ~ 407HV0. 05. The polarization curve and the EIS analysis showed that the corrosion potential of unsealed and sealed coating was -619. 93 mV and -74. 69 mV separately, the barrier layer resistance of unsealed and sealed coating was 1. 4×105 Ω·cm2 and 2. 376×106 Ω·cm2 separately, which indicated that corrosion resistance can be enhanced and improved by sealing. Conclusion Hard anodic oxide coatings on 2A12 aluminum alloy can be stably prepared in electrolyte of hybrid acids, and the coating should be sealed. |
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