含氧水蒸气中固态盐膜下金属中温电化学-化学腐蚀协同机制研究

针对热端部件在海洋大气环境的中温腐蚀问题，利用扫描探针显微镜、X射线光电子能谱、拉曼光谱等表面分析技术，观察腐蚀过程中盐、水蒸气在金属表面的形态和化学态的变化，探讨盐、水蒸气在金属表面各自的吸附-解离过程及相互作用规律，分析盐膜和氧化膜中载流子的形成机制，阐明电化学反应发生的根本原因；利用电化学测试技术获得M-S曲线，配合稳态电化学测量技术，分析腐蚀过程中盐膜、氧化膜中载流子的种类、密度和传输速度的变化规律；通过分析载流子的传输行为，阐明电化学腐蚀的微观机制；通过对金属长期腐蚀过程中电化学反应和化学氧化行为的分析，揭示含氧水蒸气中固态盐膜下金属电化学反应与化学氧化的协同作用规律，全面掌握金属在海洋大气环境中的中温腐蚀规律。

In this study, the main focus was put on the electrochemical corrosion behavior and its synergic effect with oxidation process of the metals under solid salt deposit in water vapor at intermediate temperature, basing on it's the long-term corrosion performance. In order to find out the main factor which induced the electrochemical reaction and to elucidate the electrochemical corrosion mechanism,the morphologies and chemical states of water vapor and solid salt will be detected using SEM, XRD,XPS and in-situ SPM. The adsorption -decomposition process of water vapor and salt on the alloy surface as well as the interaction between them can be analyzed basing on the the above experiment results. The type, the density and the diffusion speed of the carriers in salt and oxidation film will be measured by electrochemical technique and the formation mechanism of the carrier will be analyzed as well.