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| Corrosion Resistance of 7050 Aluminum Alloy Hard Anodic Oxide Film in Tropical Marine Atmosphere |
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| DOI：10.7643/issn.1672-9242.2022.10.014 |
| KeyWord:7050 aluminum alloy hard anodic oxide film chromate seal boiling water closed tropical marine atmospheric environment corrosion resistance |
| Author | Institution |
| DENG Tao |
Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| WANG Mao-chuan |
Southwest Technology and Engineering Research Institute, Chongqing, , China |
| XU Bin |
Southwest Technology and Engineering Research Institute, Chongqing, , China |
| ZHONG Yong |
Southwest Technology and Engineering Research Institute, Chongqing, , China |
| FENG Li-jun |
Southwest Technology and Engineering Research Institute, Chongqing, , China |
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| Abstract: |
| This paper aims to study the variation of corrosion resistance of 7050 aluminum alloy hard anodic oxide film in tropical marine atmospheric environment. The hard anodic oxide film was prepared on the surface of 7050 aluminum alloy, and then it was treated by three processes:non-sealing treatment, boiling water sealing treatment, and chromate sealing treatment. The corrosion resistance of samples was tested by laboratory multi-factor combined cycle simulation test and outdoor direct exposure of tropical marine atmospheric environment. The change rule of corrosion resistance was analyzed by appearance, polarization curve and electrochemical impedance spectroscopy. The corrosion resistance of hard anodizing film without sealing treatment is poor. White corrosion products appear on the surface after the first cycle of multi-factor combined cycle test in the laboratory, and the rating is 5/2xA. After 12 months of outdoor exposure test, the self-corrosion potential of the unclosed film was ‒814.88 mV, the self-corrosion current density was 0.307 µA/cm2, the self-corrosion potential of the boiling water sealing film was ‒717.86 mV, the self-corrosion current density was 0.177 µA/cm2, the self-corrosion potential of dichromate sealing film was ‒703.33 mV, and the self-corrosion current density was 3.82×10‒2 µA/cm2. After 12 months of outdoor exposure, the impedance modulus of the non-sealing treatment, boiling water sealing treatment, and dichromate sealing treatment at 0.01Hz were 1.04×105Ω.cm2, 1.51×105Ω.cm2, and 4.76×105Ω.cm2, respectively. The sealing treatment can improve the corrosion resistance of 7050 aluminum alloy hard anodic oxide film, and the sealing corrosion resistance of dichromate is better than that of boiling water. |
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