2524铝合金包铝层在模拟油箱积水环境中结垢及其对腐蚀行为的影响

摘要

Aluminum alloy corrosion and scaling is a universal problem during the use of fuel tank.The scaling and corrosion behavior of 2524 aluminum alloy with cladding were characterized and investigated in simulated fuel tank water environment by SEM,EDS and video microscope.Results indicate that the sealing behavior of 2524 aluminum alloy cladding in simulated fuel tank water environment can be divided into two states,the main component of scaling materials in the first state is Fe(OH)3 colloid,and in the second state is precipitation of hydroxide.With time,scaling area could change by rule of specific power function.In the first 24h,scaling materials accelerate the corrosion of aluminum alloy cladding; after 24h they prevent further corrosion of the material in simulated fuel tank water environment.%基于飞机油箱舱内铝合金在油箱积水环境中发生的结垢及腐蚀行为,采用电子显微镜(SEM)、能谱仪(EDS)和视频显微镜等设备研究了带包铝层的2524铝合金在模拟油箱积水环境中的结垢及其对腐蚀行为的影响.结果表明:2524铝合金包铝层在模拟油箱积水环境中的结垢行为分为两个阶段,浸泡初期主要为胶体铁在试样表面的沉聚,浸泡中后期则以难溶的金属氢氧化物沉积为主,且结垢面积随时间按照特定的幂函数变化；在浸泡前24h,结垢产物促进铝合金的腐蚀,在24h以后,结垢产物对铝合金包铝层的腐蚀起到一定的抑制作用.