| HU Hao,LIN Xiu-zhou,DOU Bao-jie,MEI Yong-jun,YANG Feng,LUO Shu-wen,ZHAO Wei.Corrosion Behavior of Aircraft Skin Material in Potassium Acetate Type Deicing Fluid[J],49(10):239-246 |
| Corrosion Behavior of Aircraft Skin Material in Potassium Acetate Type Deicing Fluid |
| Received:September 05, 2019 Revised:October 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.027 |
| KeyWord:aircraft skin deicing fluid aluminum alloy corrosion coating electrochemical impedance |
| Author | Institution |
| HU Hao |
1.a.School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong , China |
| LIN Xiu-zhou |
1.a.School of Materials Science and Engineering, b.Materials Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science & Engineering, Zigong , China |
| DOU Bao-jie |
1.a.School of Materials Science and Engineering, b.Materials Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science & Engineering, Zigong , China |
| MEI Yong-jun |
2.The Second Research Institute of CAAC, Chengdu , China |
| YANG Feng |
1.a.School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong , China |
| LUO Shu-wen |
2.The Second Research Institute of CAAC, Chengdu , China |
| ZHAO Wei |
1.a.School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong , China |
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| Abstract: |
| The work aims to evaluate whether the potassium acetate type deicing fluid can be used for aircraft deicing and its effect on the corrosiveness of aircraft skin materials. AutoLab electrochemical workstation was used to analyze the electrochemical behavior of aircraft skin materials in different concentrations of potassium acetate type deicing fluid with and without corrosion inhibitor. The surface morphology before and after corrosion and the surface morphology of coating/matrix metal interface were observed by scanning electron microscopy. The impedance modulus of complete aircraft skin coating in deicing fluid was as high as 2.78×1010 Ω∙cm2, while the impedance modulus of defective coating was only 1.72×107 Ω∙cm2, which indicated that defects damaged the integrity of the coating, reduced the impedance mode value of the coating, and significantly accelerated the corrosion of aircraft skin materials. The time constant in the low frequency region of the aircraft skin with defects after different cycles of deicing fluid corrosion had a great change, and the Rct of the samples in the high concentration deicing fluid without inhibitor was always lower than that in the low concentration solution. The Rct of the samples in the high concentration deicing fluid at the initial stage of the test was larger, indicating that the inhibitor concentration was higher at this time, and the corrosion inhibition effect was obvious. However, with the extension of the corrosion cycle, the Rct gradually decreased, indicating that the corrosion inhibitor gradually failed, and the corrosiveness of high concentration deicing fluid gradually increased and was higher than that of low concentration deicing solution. After the corrosion test, there were some corrosion products on the surface of the aircraft skin coating and the interface between the coating and the base metal. The artificial defects damaged the integrity of the coating, reduced the adhesion of the surrounding coating, and even produced local peeling, resulting in the immersion of deicing fluid, and serious corrosion under the coating around the scratch. Potassium acetate type deicing fluid has certain corrosiveness to aircraft skin materials, especially when the coating has serious corrosion defects. |
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