飞机铝合金结构连接部位表面防护体系修理技术研究

Repairing Techniques for Surface Protecting System of Aircraft Aluminum Connection Structure

目的研究飞机铝合金结构连接部位表面防护体系修理技术。方法根据飞机铝合金连接结构腐蚀损伤特点、原防护体系类型及服役环境特点等,选取修复材料和修复工艺,制定5种不同的表面防护体系修理方法,通过在飞机典型涂层加速试验环境谱下开展加速腐蚀试验,优选出适于飞机铝合金结构连接部位表面涂层损伤修理方法。结果加速试验2周期,采用RM4修理的试件,修复部位表面开始出现脱落现象。加速试验6周期,在紧固件区域,采用RM1,RM2,RM3,RM5修理的试件在变色、粉化、开裂、起泡和剥落指标上都属于优或者良,但在生锈指标上仅采用RM3修理的试件属于良;在非紧固件区域,采用RM1,RM2,RM3,RM5修理的试件在各指标上都属于优或者良。结论 RM3更适用于飞机铝合金结构连接部位表面防护体系修理。

Objective To research repairing techniques for surface protecting system of aircraft aluminum connection part. Methods According to the corrosion damage features of the aircraft aluminum connection structure,the original protecting system type, the service environmental features and so on, the repairing material and the repairing process were selected and five different repairing methods（RM） for the protecting system were developed. By carrying out the accelerated corrosion test under the environment spectrum of the typical aircraft coating accelerated test, the preferred repairing method adapted for the surface protecting system of the aircraft aluminum connection structure was selected. Results At 2 cycles of the accelerated test, the surface of the repairing part began shedding by using RM4. At6 cycles of the accelerated test in the fastening area, the repairing part by RM1, RM, RM3 or RM5 were all excellent or good in the indicators of color, chalking, cracking, blistering and peeling, however, only the repairing part by RM3 was good in the indicator of rusting. In the non-fastening area, the repairing part by RM1, RM2, RM3 or RM5 were all excellent or good in all indicators. Conclusion RM3 was more suitable for repairing of the surface protecting system of the aircraft aluminum connection part.