Effects of cerium salts on corrosion behaviors of Si–Zr hybrid sol–gel coatings

作     者：Yu Mei Liu Yuxing Liu Jianhua Li Songmei Xue Bing Zhang You Yin Xiaolin 

作者机构：School of Materials Science and Engineering Beihang University 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2015年第28卷第2期

页      面：600-608页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (No. 21371019) the Aeronautical Science Foundation of China (No. 2011ZE51057) 

主　　题：Cerium salts Corrosion resistance Hybrid coating Inhibitor 

摘      要：The present work examines the effects of cerium salts on corrosion behaviors of Si-Zr hybrid sol-gel coatings. The Si-Zr hybrid sol-gel coatings on a 2A l2 aluminum substrate were pre- pared through hydrolysis and condensation of glycidoxypropyl-trimethoxy-silane （GTMS） and zirconium（IV） n-propoxide （TPOZ）. Used as inhibitors for corrosion, three types of cerium salts （Co（NO3）3, CeCl3, and Ce（CH3COO）3） were doped into the sol-gel coatings. Fourier transform infrared （FTIR） and scanning electron microscopy （SEM） were employed to investigate the structures and morphologies of various coatings, and the corrosion resistances of the coatings were evaluated by electrochemical methods and neutral salt spray tests. Experimental results indicate that the addition of cerium salts can hinder the process of corrosion due to their self-healing abili- ties. Furthermore, the sol-gel coating doped with Ce（CH3COO）3 has the best corrosion resistance because of the promotions of hydrolysis and condensation provided by CH3COO-.