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基于飞机油箱舱内的铝合金在油箱积水环境中发生的腐蚀损伤问题,通过研究腐蚀形貌、最大点蚀坑深度、最大点蚀坑开口面积、表面腐蚀损伤度、交流阻抗响应等变化,分析了温度对2A12铝合金在模拟油箱积水环境中初期腐蚀行为的影响。研究发现,最大点蚀坑深度、开口面积、表面腐蚀损伤度都随着温度的升高而增加,特别当温度升高到65℃和75℃时,腐蚀严重加剧,各项评价指标显著增大。在25、35、45、55℃模拟油箱积水环境中,最大点蚀坑深度及开口面积随时间的关系呈现幂函数变化规律,而在65℃、75℃时,其遵循最小二乘法多项式拟合。电化学交流阻抗谱测试结果表明,2A12铝合金在3个特征温度(常温25℃、中温55℃及高温75℃)下的腐蚀速度快慢为V75℃>V55℃>V25℃。
Based on the corrosion damage of the aluminum alloy in the fuel tank tank in the water environment of the tank, the corrosion morphology, the maximum pits depth, the maximum pits opening area, the surface corrosion damage degree and the AC impedance response were studied. The effect of temperature on the initial corrosion behavior of 2A12 aluminum alloy in simulated water environment of tank was analyzed. The results show that the maximum pitting pit depth, the opening area and the surface corrosion damage degree increase with the increase of the temperature. Especially when the temperature is raised to 65 ℃ and 75 ℃, the corrosion seriously aggravates and the evaluation indexes increase significantly . In 25, 35, 45, 55 ℃ simulated water tank environment, the maximum pits depth and the opening area showed a power function variation with time, while at 65 ℃, 75 ℃, following the least square polynomial to be Together The results of electrochemical impedance spectroscopy (EIS) showed that the corrosion rate of 2A12 aluminum alloy was V75 ℃> V55 ℃> V25 ℃ at three characteristic temperatures (room temperature 25 ℃, intermediate temperature 55 ℃ and high temperature 75 ℃).