六方氮化硼基自修复涂层的结构设计及其钝化/缓蚀协同防护机理研究

海洋极端环境下的腐蚀问题是海洋工程材料面临的最大挑战之一，石墨烯基防护涂层能显著提高海洋工程装备的防腐性。然而，石墨烯的高导电性容易引起电偶腐蚀，降低海洋工程装备的服役寿命。本项目围绕海洋环境金属装备面临的关键难题，将六方氮化硼的高效分散和自组装结构设计相结合，开发兼具耐腐蚀、抗渗透、长寿命的六方氮化硼基自修复涂层。通过利用六方氮化硼的高效分散性及绝缘性、苯胺三聚体的电活性及功能性碳点的缓蚀吸附性，提高涂层海洋环境下的耐蚀性及自修复性。通过系统科学的电化学试验和表征分析，揭示六方氮化硼基自修复涂层海水环境下的耐蚀行为及钝化/缓蚀协同防护机理，提出六方氮化硼基自修复涂层的自组装结构设计准则和制备工艺流程。本项目的实施不仅能拓展六方氮化硼基自修复涂层海水环境耐蚀领域的基础研究，也将为海水环境工程装备金属部件表面高性能防腐涂层的结构设计与制备提供科学基础和技术支撑，具有重要的科学价值和应用意义。

The corrosion in extreme marine environments is one of the biggest challenges faced by marine engineering materials. Graphene-based protective coatings can significantly improve the corrosion resistance of marine engineering equipment. However, the high conductivity of graphene can easily cause galvanic corrosion and reduce the service life of marine engineering equipment. According to the key challenges faced by metal equipment in marine environment, this project combines the efficient dispersion of hexagonal boron nitride and the design of self-assembled structures to develop a hexagonal boron nitride-based self-healing coating with good corrosion resistance, strong anti-permeability and long service life. By using the high-efficiency dispersibility and insulation of hexagonal boron nitride, the electrical activity of aniline trimer and the corrosion inhibition of functional carbon dots, the corrosion resistance and self-healing properties of the coating in the marine environment are improved. Through systematic and scientific electrochemical experiments and characterization analysis, the corrosion resistance behavior and passivation/inhibition synergistic protective mechanism of hexagonal boron nitride-based self-healing coating in seawater environment are studied, and the design criteria and preparation process of self-assembly structure of hexagonal boron nitride-based self-healing coating are proposed. The implementation of this project can not only expand the basic research of hexagonal boron nitride-based coating in the corrosion field of seawater environment, but also provide scientific basis and technical support for the structural design and preparation of high-performance anti-corrosive coating on metal part of engineering equipment in seawater environment, which have important scientific value and application significance.