Effect of APTES Modified Montmorillonite on Protective Property of Hybrid Sol-gel Coating on Mg-alloy

doi:10.11902/1005.4537.2021.119

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 464-470 DOI: 10.11902/1005.4537.2021.119

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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.

Key words: Mg- alloy inorganic-organic hybrid sol-gel coating montmorillonite modification assembly

Received: 28 May 2021

ZTFLH:

TB332

Fund: Science and Technology Commission of Shanghai Municipality(19DZ2271100)

Corresponding Authors: ZHANG Junxi E-mail: zhangjunxi@shiep.edu.cn

About author: ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn

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Cite this article:

LIU Xuanxuan, YU Jinshan, GAO Yan, ZHAO Peng, WANG Qiwei, DU Zhuoling, ZHANG Junxi. Effect of APTES Modified Montmorillonite on Protective Property of Hybrid Sol-gel Coating on Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 464-470.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.119 OR https://www.jcscp.org/EN/Y2022/V42/I3/464

Fig.1 Surface morphologies of as-prepared AP-MMT: (a) low magnify, (b) high magnify

Fig.2 XRD (a) and FTIR (b) spectrum of Na-MMT and AP-MMT

Fig.3 Surface morphologies of PSG (a) and APSG (b) coated sample and cross-sectional morphology of sol-gel coating (c)

Fig.4 Polarization curves of different coated samples

Table 1 Electrochemical parameters of polarization curve

Fig.5 Bode plots of PSG (a, b) and APSG (c, d) coated sample after immersing in 0.05 mol/L NaCl solution for different time

Fig.6 Equivalent electrical circuits of EIS of different coated samples at different soaking stage: (a) bare 1 h; (b) PSG 1 h, APSG 1 h-15 d; (c) PSG 7 d-15 d

Table 2 Equivalent fitting parameters from Bode plots

Fig.7 Morphologies of PSG (a) and APSG (b) coated samples after immersing in 0.05 mol/L NaCl solution for 15 d

Fig.8 Schematic representation of the coating formation mechanisms of the APSG coating

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