激光合金化作用下的镁合金表-界面构效关系及腐蚀机理模型

项目名称： 激光合金化作用下的镁合金表-界面构效关系及腐蚀机理模型

项目编号： No.51505464

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 王凌倩

作者单位： 中国科学院兰州化学物理研究所

项目金额： 20万元

中文摘要： 本项目针对镁合金激光合金化层界面微观结构与表面宏观腐蚀性能之间相互作用机制的关键问题，开展镁合金表面激光合金化层的设计制备及其腐蚀行为和机理系统研究。考察微量元素的引入对微观界面结构、界面反应规律和界面性质的影响，研究激光合金化处理后体系残余应力的类型、大小和分布，分析晶格结构的改变与体系残余应力之间的关系，明确镁合金表层晶格畸变和晶格重构的主要原因。考察激光合金化过程中镁合金表层复杂微观界面结构的转变过程，研究微观界面结构和组成的改变对镁合金表面宏观耐腐蚀性能的影响，明确表-界面之间的构效关系。深入研究激光合金化作用下镁合金的腐蚀机理，建立其腐蚀延寿模型，丰富和发展镁合金的腐蚀失效理论，为高耐蚀性能镁合金材料的制备提供理论依据和技术支持。

中文关键词： 镁合金；激光合金化；残余应力；表-界面构效关系；腐蚀机理

英文摘要： Based on the key problem of interaction mechanism between micro interfacial structure and macro surface corrosion properties of laser surface alloyed magnesium alloys, researches on design and preparation of laser surface alloyed layer on magnesium alloys and its corrosion behavior and mechanism will be carried out in the present project. Effect of alloying elements on the microscopic interfacial structure, interfacial reaction rules and interfacial properties will be studied. Type, value and distribution of residual stress in the system after laser surface alloying will be investigated. The relationship between lattice microstructure and residual stress will be examined. The main reason for lattice distortion and lattice reconstruction on the surface of magnesium alloys will be clarified. The transformation process of complex interfacial structure during laser surface alloying process will be focused on. Effect of variation in micro interfacial structure and composition on macro corrosion resistance will be researched to clarify the relationship between interfacial microstructure and surface properties. The corrosion mechanism of magnesium alloys after laser surface alloying will be studied in depth and the life-extended model will be established. The project aims at enriching and developing the corrosion failure theory of magnesium alloys, and offering theoretical basis and technical support for the preparation of high corrosion resistant magnesium alloys.

英文关键词： Magnesium alloys;Laser surface alloying;Residual stress;Relationship between interface and surface;Corrosion mechanism