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| Corrosion Behavior of Nano-coating/Aluminum Alloy in Seawater Solution with Different pH Values |
| Received:July 29, 2019 Revised:August 19, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.01.021 |
| KeyWord:nano coating pH water solution EIS spectra |
| Author | Institution |
| MU Xian-lian |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| XIE Peng-fei |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| JIN Tao |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| ZHANG Deng |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| ZHAO Lian-hong |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| WANG Hao-wei |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
| LIAO Sheng-zhi |
Aviation Key Laboratory of Science and Technology on Structure Corrosion Prevention and Control, China Special Vehicle Research Institute, Jingmen , China |
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| Abstract: |
| The paper aims to evaluate the corrosion behavior of nano-coating/aluminum alloy in seawater solution with different pH values. Through testing the EIS value of nano coating/aluminum alloy in sea solution of different pH values, the evolution law of impedance spectra and Bode spectrogram of samples were analyzed to establish different electrode impedance models of different EIS spectra, and the ZView software was used to analyze electrochemical impedance spectroscopy of the coating system in different periods, to obtain the change tendency of the coating resistance and the corrosion failure rate of the nano coating system in sea solution of different pH values. With the increase of immersion time and the decrease of pH value, the corrosion damage failure rate of nano-coating/aluminum alloy system generally increased in the early immersion period; but in the middle and later stages, as corrosion products gradually blocked the coating pores, the penetration rate of corrosion medium to the surface of aluminum alloy gradually decreased. For the nano-coating systems with different pH values, the corrosion failure rate is as follows:coating 1 immersed in seawater of pH 2.0 failed the fastest, followed by coating 2 immersed in seawater of pH 4.0, and finally followed by coating 1 immersed in seawater of pH 6.0. The coating systems should be fitted with equivalent circuit model C. |
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