多孔、多相、多层可磨耗封严涂层常温/高温交变环境下的腐蚀行为研究

可磨耗封严涂层在海洋环境中的腐蚀问题严重威胁着航空发动机的稳定运行和安全服役，制约了我国南海经济开发战略的稳步实施；涂层结构的复杂性和腐蚀形式的多样性又增加了防腐研究的难度。本项目在前期研究工作基础上，通过模拟实验研究300-450°C服役的铝基可磨耗封严涂层在常温海洋环境中的层间电偶腐蚀以及由此引起的铝金属基的点蚀行为、450-800°C服役的铜基、镍基可磨耗封严涂层在盐水蒸气共存的海洋大气环境中的高温腐蚀行为以及上述涂层在常温/高温交变的模拟海洋环境中腐蚀行为这三大关键腐蚀问题，全面阐释可磨耗封严涂层在全寿命周期内腐蚀破坏的微观机制，明确决定涂层腐蚀失效的关键材料因素和环境因素，进而为我国建立自主完备的可磨耗封严涂层设计体系和维护手段、从根本上解决涂层的腐蚀问题提供必要的理论支撑和实验室依据。

In order to maintain the safety and stability of the aircraft engine, we will carry out fundamental research on the severe corrosion performances of abradable seal coating systems in the marine atmospheric environment even through it is difficult to work because of the complexity of structure and the variety of corrosion performance of the coating systems. Basing on the previous researches, we put focus on three kinds of corrosion behavior which play a key role in the anticorrosion ability of the coatings. For aluminum matrix abradable seal coating systems being used at 300-450°C, we will discuss about the galvanic corrosion behavior between the multilayers of the coatings at normal atmospheric temperature, and the pitting corrosion behavior of Al matrix aroused by the galvanic corrosion among the multilayer. For the copper matrix and nickel matrix abradable seal coating systems being used at 450-800°C, we intend to focus more on their oxidation behavior at high temperature when salt and water vapor coexist. Finally, we will study about the corrosion behavior of the abradble seal coating systems at an alternating temperature, which alternates between normal atmospheric temperature and high temperature. Data from experiments above together with theoretical analysis will allows us to figure out factors that can play crucial roles in the corrosion process and provide design criterion and security maintain technology. The research is of far-reaching significance for the economic development in South China Sea.