Corrosion protection of AZ31 magnesium alloy treated with La^(3+) modified 3-methacryloxypropyltrimethoxysilane conversion film

作     者：乔英杰 李文鹏 王桂香 张晓红 QIAO Yingjie;LI Wenpeng;WANG Guixiang;ZHANG Xiaohong

作者机构：Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2015年第33卷第6期

页      面：647-654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 Fundamental Research Funds for the Central Universities(HEUCF20151010) Heilongjiang Province Science Fund for Youths(QC2012C068) Harbin Special Funds for Scientific and Technological Innovations(RC2014QN015006) Natural Science Foundation of China(NSFC 51479037) 

主　　题：AZ31 Mg alloy silanes lanthanum corrosion rare earths 

摘      要：This study demonstrated the influence of addition concentration of La3＋ on the anti-corrosion behavior of a 3-methacry- loxypropyltrimethoxysilane （MPS） film formed on AZ31 magnesium alloy. The morphology and surface chemistry of the samples were evaluated through scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FT-IR）, respectively. The corrosion resistance of the pre-treated AZ31 magnesium alloy was studied during immersion in 0.1 mol/L NaC1 solution, using poten- tiodynamic polarization curves and electrochemical impedance spectra （EIS）. In comparison to MPS film, the low concentration of La3＋ ion modified silane layer exhibited a better anti-corrosion performance, nevertheless, the high concentration of La3＋ ion modified was worse. Results showed that the preferable addition concentration of La3＋ ion in the silane film was 5Х 10-4 mol/L in this experi- ment.