飞机铝合金结构连接部位的腐蚀行为

简要阐述了飞机铝合金结构连接部位的腐蚀特点，采用加腐蚀试验方法研究了含有防腐涂层模拟件的腐蚀行为，在试验室条件下再现了服役期间飞机铝合金结构连接部位的腐蚀损伤历程，同时探讨了其腐蚀机理及其影响因素。结果表明，连接部位是飞机铝合金结构的腐蚀薄弱环节，是最容易出现腐蚀活性点和膜下腐蚀的区域，在腐蚀环境下连接部位缝隙处涂层最先出现鼓包和开裂，涂层剥落后金属基体有点蚀坑存在，随着腐蚀时间增加，点蚀向晶间腐蚀发展，最后出现剥蚀。

CORROSION BEHAVIOR ON JOINT SECTION OF AIRCRAFT ALUMINIUM ALLOY STRUCTURE

The corrosion features on the joint section of aircraft aluminum alloy structure were expounded briefly. The corrosion behaviors on the simulated specimen painted coating were studied using the accelerated corrosion testing method. The corrosion damage course on the joint section of aircraft aluminum alloy structure during the period of service was reproduced under the laboratory condition. Meanwhile, the corrosion mechanism and effect on the structure are concerned. The results showed that, the joint sections are the corrosion vulnerable spots and the easiest appearing corrosion active spots and the areas of corrosion under the coating on aircraft aluminium al- loy structure. The coating on the chink of the joint section occurs projections and cracks at first. There were cor- rosion pits on the metal face when the coating peeled off. And then pitting corrosion transformed intergranular corrosion with corrosion time prolonged. Lastly, exfoliation corrosion occurred.