沿海机场某型飞机典型结构件自然曝晒试验研究

目的研究某型飞机典型结构件的腐蚀机理。方法在海南陵水机场进行自然曝晒试验,采用表面宏观形貌记录和微观形貌表征法、腐蚀产物物相分析等手段对基体及上覆防护体系的腐蚀、老化性能进行评估,进而得出该型飞机不同部位的防护性能变化规律。结果其中试件边缘、与螺栓直接接触的部位和试件连接处涂层老化、脱落最为严重,涂层脱落后裸露的基体也会出现较为严重的腐蚀现象;而一般远离螺栓、边缘和断口的区域则涂层老化、脱落均匀,腐蚀程度较轻。结论相同环境谱作用下,受力壁板连接关键部位不同部位发生腐蚀的类型、机理不同。

Performance of Typical Structures of A Type of Aircraft after Natural Exposure in a Coastal Airport

Objective To study the corrosion mechanism of typical structures of a type of aircraft. Methods Natural exposure test of typical aircraft structures were carried out in Lingshui coastal airport. The surface morphology and the composition of corrosion products were obtained by means of SEM and XRD, which were used to evaluate the corrosion and aging performance of substrate and its overlying corrosion protection system, and to obtain the changing law of the protection performance at different parts of the aircraft. Results Different parts showed different mechanism and types of corrosion even in the same environment. The coating of the specimen, which directly contacted with the edge and bolt parts, and the specimen joint showed most serious aging and falling off phenomenon, leading to serious corrosion in the exposed substrate, while the corrosion degree of other parts was lighter, with even aging and falling off of the coating. Conclusion Under the action of the same environmental spectrum, the corrosion types and mechanisms at different parts of the critical connecting structures of the force-bearing panel.