摘要
综述了大气环境中金属腐蚀和涂层失效的机理、影响腐蚀失效的各种因素及研究方法和手段 ,展望了研究前景 .老化和涂层下金属腐蚀是引起涂层失效两个重要的因素 ,老化为自由基机理 ,涂层下金属腐蚀为电化学反应机理 .影响腐蚀失效的各种因素包括涂层性能、气体污染物、基体金属上可溶盐污染、基体金属表面状态和处理等 .研究方法主要有电化学方法和光谱学方法 ,电化学方法中最主要的是电化学阻抗法 ,较新的是Kelvin扫描电极 ;光谱学方法包括红外光谱、激光拉曼光谱等 .现代采用多种方法综合研究 。
Underfilm corrosion of metals and failure of organic coatings in atmosphere are of great interesting and practical meaning.Weathering and underfilm corrosion are the two most important factors which cause failure of organic coatings.The mechanism of weathering is generally considered to be radical reaction initiated by photon while the mechanism of underfilm corrosion,to be electrochemical reaction.The factors affecting the corrosion and failure include property of the coating,air pollutant,contamination of soluble salts on metal substrate,surface condition and treating of substrate,and so on.The researching approaches are mainly electrochemical methods including DC and AC methods,and spectroscopy.Of the electrochemical methods,the electrochemical impedance spectroscopy (EIS) is the most important and widely used,and the Kelvin scanning probe is a new and promising method.Spectroscopy includes infrared spectroscopy and Raman spectroscopy.Nowadays it is common to use these methods coordinately and to carry out in situ on-line measurements.The present paper reviews the above aspects.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2002年第4期249-256,共8页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金资助项目 ( 5 99710 5 0 )
关键词
金属
涂层
大气腐蚀
coating,atmosphere corrosion
