Objective To research causes for corrosion damage of lower wainscot skin of a certain aircraft flap cabin,analyze corrosion hazards,set down repair scheme,and put forward advices and measures of future corrosion protection and control.Methods Firstly,the structure's corrosion state at the scene was checked carefully;then the structure corrosion causes were studied from several aspects such as structure design and material selection,service environment analysis,corrosion product analysis.Targeted reinforcement repair scheme for corrosion position was made.Results Interior condensate water generated in the flap cabin local at the high temperature wet-hot environment,with the invading of Cl ion pollution floating in the air,resulted in crystal flake corrosion of wainscot skin material LY 12 aluminum alloy.Conclusion Corrosion causes of aged aircraft structure are complex and diversified.Accurate definition of corrosion causes is the key to develop corrosion protection and control measures.%目的 研究某型机襟翼舱下壁板蒙皮产生腐蚀损伤的原因,分析腐蚀危害性,制定腐蚀修补方案,提出后续腐蚀防护与控制的建议措施.方法 首先现场仔细检查结构的腐蚀状况,然后分别从结构设计与选材、服役环境分析、腐蚀产物分析3个方面研究结构腐蚀产生的成因,并且针对性地制定腐蚀部位的补强修理方案.结果 在襟翼舱局部高温湿热环境下形成的内部冷凝水,夹杂大气环境中的Cl-污染侵袭,导致壁板蒙皮材料LY12铝合金产生了晶间剥落腐蚀.结论 老龄飞机机体结构腐蚀成因复杂多样,准确界定腐蚀原因是制定腐蚀防护与控制措施的关键.
展开▼
