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| Electrochemical Property for 2024-T62 Aluminum Alloy Surface Protective Coating in the Presence of Outfield Corrosion |
| Received:August 10, 2015 Revised:February 15, 2016 |
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| DOI：10.7643/issn.1672-9242.2016.01.002 |
| KeyWord:coating corrosion condition aluminum alloy electrochemical impedance corrosion resistance |
| Author | Institution |
| JIN Tao |
1. China Special Vehicle Research Institute， Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control， Jingmen ， China; 2. Key Laboratory of Aerospace Materials and Performance Ministry of Education， School of Materials Science and Engineering， Beihang University， Beijing ， China |
| HE Weiping |
China Special Vehicle Research Institute， Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control， Jingmen ， China |
| LIAO Shenzhi |
China Special Vehicle Research Institute， Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control， Jingmen ， China |
| LIU Chengchen |
China Special Vehicle Research Institute， Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control， Jingmen ， China |
| WANG Haowei |
China Special Vehicle Research Institute， Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control， Jingmen ， China |
| DIAO Peng |
Key Laboratory of Aerospace Materials and Performance Ministry of Education， School of Materials Science and Engineering， Beihang University， Beijing ， China |
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| Abstract: |
| Objective To evaluate the corrosion resistance performance of the coating under the condition of natural exposure. Methods Field exposure experiments of 2024-T62 aluminum alloy coating (N1 and N2) under comprehensive corrosion conditions including wet and heat exposure, UV irradiation and salt spray were carried out, selecting the tropical marine environment in Xisha as the natural exposure field. Electrochemical methods were adopted to investigate the corrosion resistance of the exposed coatings after immersing in 3.5% NaCl for different time. Results The results showed that the electrochemical impedance of the coating after the field exposure decreased, indicating the significant accelerating effect of the comprehensive corrosion condition, Ccoat-T increased and Rcoat decreased continuously with the elongation of immersion time in 3.5% NaCl. Conclusion The electrochemical impedance of the exposed N1 coating was relatively high, implying its strong corrosion resistance. |
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