三种不同面容比模拟积水溶液环境中300M钢的腐蚀行为

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、20 mL/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。

Corrosion Behavior of 300M Steel in Three Area-to-Volume Ratio Simulated Water Environments

The corrosion of 300M steel in gap water produced in airplane structure parts is a big problem. The influence of the area-to-volume ratio on the corrosion behavior of 300M steel in simulated water is studied by evaluating the weight loss,corrosion rate,damage degree,dissolved oxygen and pH value of the solution with Tafel test and electrochemical impedance spectrum. The results indicate that with the process of corrosion the content of dissolved oxygen is reduced while the pH value rises in all the three different area-to-volume solutions(2,5,20 mL/cm²). The greater the area-to-volume ratio is,the greater is the weight loss and corrosion rate. Tafel test and electrochemical impedance spectrum show that the corrosion resistance differences of 300M ultra-high strength steel lead to different corrosion degrees in the three different area-to-volume ratio solution environments, and the corrosion rate relationship is V₂₀>V₅>V₂.