钛合金腐蚀-污损复合界面电子/离子转移机制原位研究

海洋工程材料的“锈疾+污疾”成为海洋技术“卡脖子”的经典难题，不仅关系到海洋工程服役安全，同时产生的重金属污染已经严重影响海洋生态和海洋碳汇。随着成本降低，耐蚀性能优异的“海洋金属”钛合金成为优选材料，但是良好的生物相容性导致其污损问题异常严峻，并诱发点蚀、缝隙腐蚀等破坏，限制了其在海洋环境中的广泛应用。因此，本项目围绕钛合金腐蚀-污损难题，首次聚焦交互作用核心区域—独特的半活性、半生命复合界面，从复合界面的电子、离子转移入手，借助高时间、高空间分辨的同步辐射QXAFS、μ-XRF/XAFS与电化学、生物学方法联用新技术，在人工模拟海洋环境中实现同时间、同位点的对腐蚀-污损复合界面电子、离子转移过程的原位实时研究，揭示腐蚀-污损过程的微观结构动态演化规律，构建基于复合界面电子、离子转移的腐蚀-污损交互作用机制新模型，明确关键控制步骤及离子毒性转化机制，以此助力海洋工程服役安全和海洋碳汇。

The "Rust+Fouling" of marine engineering materials has become a classic problem of marine technology, which is not only related to the safety of marine engineering service, but also the heavy metal pollution has seriously affected the marine ecology and marine carbon sink. With the reduction of cost, the "Marine metal" titanium alloy with excellent corrosion resistance has become the preferred material, but its good biocompatibility leads to the extremely serious fouling problem and induces damage such as pitting corrosion and crevice corrosion, which limits its wide application in the marine environment. Therefore, focusing on the corrosion and fouling problem of titanium alloy, this project focuses on the unique semi active and semi life composite interface, which is the core area of interaction for the first time. Starting with the electron and ion transfer at the composite interface, we realize the in-situ real-time study of electron and ion transfer process at the corrosion and fouling composite interface at the same time and at the same site in the artificial simulated marine environment, with the help of high time and high spatial resolution synchrotron radiation QXAFS and μ-XRF/XAFS combined with electrochemical and biological methods. Finally, reveal the microstructure dynamic evolution law of corrosion and fouling process. Build a new model of corrosion and fouling interaction mechanism based on composite interface electron and ion transfer, and clarify the key control steps and ion toxicity conversion mechanism, so as to help the service safety of offshore engineering and marine carbon sink.