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Effect of APTES Modified Montmorillonite on Protective Property of Hybrid Sol-gel Coating on Mg-alloy |
LIU Xuanxuan1, YU Jinshan2, GAO Yan1, ZHAO Peng2, WANG Qiwei1, DU Zhuoling1, ZHANG Junxi1( ) |
1.Shanghai Key Laboratory of Electric Power Material Protection and New Material, Shanghai University of Electric Power, Shanghai 200090, China 2.Electric Power Research Institute of State Grid Tianjin Electric Power Company, Tianjin 300384, China |
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Abstract Due to the poor compatibility between montmorillonite and organic-inorganic hybrid sol-gel system, APTES (aminopropyltriethoxysilane) was used to graft-modification of montmorillonite (AP-MMT) . Through the introduction of amino group on the surface of montmorillonite to establish a tough bonding with the sol-gel system, a more compact and stable composite coating was obtained on AZ31B Mg-alloy. The characterization of montmorillonite indicated that APTES were successfully grafted onto the montmorillonite lamellae. Analysis results showed that the corrosion resistance of sol-gel coating with AP-MMT was improved to a certain extent compared with that of pure sol-gel coating. Electrochemical impedance spectroscopy (EIS) analysis of coated samples immersing in 0.05 mol/L NaCl solution for different time showed that the sol-gel coating before and after doping with AP-MMT exhibited different failure mechanism, which were related to the denser structure caused by the addition of modified montmorillonite.
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Received: 28 May 2021
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Fund: Science and Technology Commission of Shanghai Municipality(19DZ2271100) |
Corresponding Authors:
ZHANG Junxi
E-mail: zhangjunxi@shiep.edu.cn
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About author: ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn
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