镁合金智能自修复防护体系的构建及自修复防护机理研究

项目名称： 镁合金智能自修复防护体系的构建及自修复防护机理研究

项目编号： No.21273293

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李凌杰

作者单位： 重庆大学

项目金额： 82万元

中文摘要： 镁合金化学性质活泼，并且其表面防护体系作用有限、不具有自修复功能，这导致镁合金耐蚀性差，严重阻碍其发挥性能优势。 本项目拟构建镁合金智能自修复防护体系并研究其自修复防护机理，具体包括：基于对成膜基质、有效缓蚀组分的优选，借助溶胶-凝胶模板技术构建镁合金自修复防护体系；基于对有效缓蚀组分（"核"）、pH敏感性高分子材料（"壳"）的优选，借助原位模板/自组装技术构筑"核/壳"纳米结构将pH敏感性刺激-响应系统引入自修复防护体系中，实现其智能化。采用电化学阻抗谱方法评价体系的自修复防护效果，采用电镜、能谱等技术表征体系的微观形貌及组成，采用扫描开尔文探针/扫描振动电极技术、原子力显微镜、拉曼光谱、红外光谱等原位微区技术获取自修复界面的动态特征；利用物理化学理论求算自修复过程的动力学参数；提出自修复防护机理，指导体系优化。本项目将为奠定镁合金工程应用基础、发展金属智能自修复防护技术提供指导和参考。

中文关键词： 腐蚀；自修复；“核/壳”结构；镁合金；智能材料

英文摘要： Magnesium and its alloys have limited application in corrosive environments because of their poor corrosion resistance. To greatly improve the corrosion resistance of magnesium alloys and thus extend their applications in rigorous environments, the "smart" self-healing anticorrosion protective systems for magnesium alloys, which can promptly respond to changes in the local environment and heal the coating defects, are urgently desired. In this proposal, the construction strategies of such "smart" self-healing anticorrosion protective systems are proposed and the "smart" self-healing anticorrosion mechanism is expected to elucidate. First, the self-healing anticorrosion protective systems for magnesium alloys will be developed, which are based on the inhibitor-containing hybrid sol-gel coating matrix. Secondly, the pH-dependent triggered release structure, which has the pH-sensitive polymer shell and the effective inhibitor core, will be induced to endow the protective system with intelligence. The "smart" self-healing anticorrosion protective system can promptly respond to the pH changes in the corrosive medium that caused by the coating damage and release the effective inhibitor to heal the coating defects, which will automatically stop as the corrosion stops and the medium pH recovers. In order to elucidate th

英文关键词： Corrosion；Self-healing；"Core/shell" structure；Magnesium alloy；Smart material