十八烷基胺在铁上成膜结构和耐腐蚀性研究

十八烷基胺(ODA)应用于热力设备停用保护技术在国外开发较早1－3]，国内电厂这二年来应用该技术也日益增多，但由于基础研究做得较少，使用效果受到影响.1996年以来我们对ODA的成膜条件和机理进行了一些研究4－6],本文利用交流阻抗、俄歇电子能谱、红外镜反射光谱、光电化学等方法对ODA的成膜结构和耐蚀性进行探讨，同时介绍ODA在电厂的应用情况.1实验实验材料为DT-4型纯铁.样品制备及交流阻抗测试见文献4－6].　　俄歇能谱(AES)Perkin-ElmerPHI550ESCA/SAM.实验在机械工业部上海材料研究所进行.　　红外镜反射(SR)Bio-R…

Study of Surface Layer Structure and Corrosion Resistance on Octadecylarnine-treated lron

The anti- corrosion performance of iron is greatly improved after octadecylamine (ODA) treatment. It is assumed from AES that the structure of surface layer of samples treated with ODA is as follows:
Lower ODA concentration: iron | iron oxide | ODA layer with iron oxide
Higher ODA concentration: iron | iron oxide | ODA layer with iron oxide | pure ODA layer
It is shown from infrared specular reflection that the surface layer of iron treated with higher ODA concentration reflects ν (CH) absorption peak corresponding to pure ODA layer. Every ν (CH) absorption peak shows opposite absorption phenomenon because of reflection from the iron oxide, which is under the pure ODA layer. Photoelectrochemical study exhibits that ODA treatment leads to the changes in physical structure of iron oxide layer.
ODA treatment was successfully applied to lay- up protection in power plant.