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基于飞机结构材料300M钢在海洋高湿环境中缝隙部位积水导致的腐蚀损伤问题,研究了300M钢在3种不同面容比模拟积水溶液环境中的腐蚀行为,借助Tafel极化曲线和电化学交流阻抗谱实验探讨了影响腐蚀速率的主要原因。在模拟积水环境中,分析了腐蚀失重、失重速率、损伤度以及腐蚀过程中腐蚀溶液溶解氧浓度、pH值与不同面容比(2、5、20mL/cm2)之间的关系。结果表明:随材料腐蚀时间的延长,腐蚀溶液中的溶解氧浓度降低,pH值上升,而且随面容比的增大,材料的腐蚀失重增加,腐蚀失重速率也增大。Tafel极化曲线和电化学交流阻抗谱结果表明,不同pH值下300M钢耐蚀性的差别导致了不同面容比环境下腐蚀损伤的差异,3种面容比模拟积水环境中腐蚀速率大小为V20>V5>V2。
Based on the corrosion damage of 300M steel caused by the accumulation of water in the crevice of oceanic high-humidity environment, the corrosion behavior of 300M steel in three kinds of simulated water solution with different surface area ratios was studied. By means of Tafel polarization curve and electrochemical exchange Impedance spectroscopy experiments to explore the main factors that affect the corrosion rate. The relationship between corrosion weight loss, rate of weight loss, degree of damage, dissolved oxygen concentration of corrosion solution, pH value and different surface area ratios (2, 5, 20 mL / cm2) was analyzed in a simulated water environment. The results show that with the increase of corrosion time, the concentration of dissolved oxygen in the solution decreases and the pH value increases. With the increasing of the surface area ratio, the corrosion weight loss increases and the rate of corrosion loss increases. The results of Tafel polarization and electrochemical impedance spectroscopy show that the difference of corrosion resistance of 300M steel at different pH values leads to the difference of corrosion damage under different surface area ratio. The corrosion rate of the three kinds of surface water environment is V20 > V5> V2.