飞机蒙皮材料在醋酸钾型除冰液中腐蚀行为研究  

Corrosion Behavior of Aircraft Skin Material in Potassium Acetate Type Deicing Fluid

作　　者：胡豪 林修洲 窦宝捷 梅拥军 羊锋 罗淑文 赵薇 HU Hao;LIN Xiu-zhou;DOU Bao-jie;MEI Yong-jun;YANG Feng;LUO Shu-wen;ZHAO Wei(School of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;Materials Corrosion and Protection Key Laboratory of Sichuan Province,Sichuan University of Science&Engineering,Zigong 643000,China;The Second Research Institute of CAAC,Chengdu 610041,China)

机构地区：[1]四川轻化工大学材料科学与工程学院,四川自贡643000 [2]四川轻化工大学材料腐蚀与防护四川省重点实验室,四川自贡643000 [3]中国民航局第二研究所,成都610041

出　　处：《表面技术》2020年第10期239-246,共8页Surface Technology

基　　金：国家自然科学基金(U1633118);四川省青年科技创新研究团队项目(2016TD0024);四川轻化工大学研究生创新基金(y2019028)。

摘　　要：目的评价醋酸钾型除冰液能否用于飞机除冰以及对飞机蒙皮材料腐蚀性的影响。方法采用AutoLab电化学工作站对飞机蒙皮材料在不同浓度缓蚀剂、无缓蚀剂醋酸钾型除冰液中的干湿交替腐蚀电化学行为进行分析,通过扫描电镜观察其腐蚀前后表面形貌及涂层/基体金属界面形貌。结果无缺陷飞机蒙皮涂层在除冰液中的阻抗模值高达2.78×10^10Ω·cm^2,而缺陷涂层的阻抗模值只有1.72×10^7Ω·cm^2,说明缺陷破坏了涂层的完整性,降低了涂层的阻抗模值,明显加速了飞机蒙皮材料的腐蚀。带缺陷飞机蒙皮试样经除冰液腐蚀不同周期后的低频区Rct存在较大变化,试样在高浓度无缓蚀剂除冰液中的Rct始终低于在低浓度溶液中的Rct;试验初期,试样在高浓度除冰液中的Rct较大,说明此时缓蚀剂浓度较高,缓蚀作用明显;但随着腐蚀周期的延长,Rct逐渐减小,说明缓蚀剂逐渐失效,高浓度除冰液的腐蚀性逐渐增强并高于低浓度除冰液。腐蚀实验后,飞机蒙皮涂层表面和涂层/基体金属界面处存在一定的腐蚀产物;人造缺陷破坏了涂层的完整性,降低了涂层的结合力,甚至产生局部剥离,造成除冰液浸入,在划痕处发生了较严重的膜下腐蚀。结论醋酸钾型除冰液对飞机蒙皮材料存在一定的腐蚀性,尤其是当涂层存在缺陷时,腐蚀较为严重。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 2.78×10^10Ω·cm^2,while the impedance modulus of defective coating was only 1.72×10^7Ω·cm^2,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

关 键 词：飞机蒙皮 除冰液 铝合金 腐蚀 涂层 电化学阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理]