APTES改性蒙脱土对镁合金表面杂化溶胶-凝胶涂层防护性能的影响

doi:10.11902/1005.4537.2021.119

中国腐蚀与防护学报

2022, Vol. 42

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

研究报告

本期目录 | 过刊浏览

APTES改性蒙脱土对镁合金表面杂化溶胶-凝胶涂层防护性能的影响

刘煊煊¹, 于金山², 高燕¹, 赵鹏², 王启伟¹, 杜卓玲¹, 张俊喜¹(

)

^1.上海电力大学电力材料防护与新材料重点实验室上海 200090
^2.国网天津市电力公司电力科学研究院天津 300384

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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摘要:

针对蒙脱土与有机-无机杂化溶胶-凝胶体系较差的相容性，使用APTES对蒙脱土进行接枝改性，通过在蒙脱土表面引入氨基建立与溶胶-凝胶体系间较强的键合，在镁合金表面制备更加致密、稳定的复合涂层。对蒙脱土的表征结果表明APTES成功接枝到了蒙脱土片层上。结果分析表明，相比于纯溶胶-凝胶涂层，添加AP-MMT的溶胶-凝胶涂层的耐蚀性具有一定程度的提高。进一步对涂层样品浸泡在0.05 mol/L NaCl溶液中不同时间的电化学阻抗谱 (EIS) 分析表明，掺杂前后的溶胶-凝胶涂层具有不同的失效机制，这些都与改性蒙脱土的添加使得涂层具有更加致密的结构有关。

关键词 ：镁合金, 有机-无机杂化溶胶-凝胶涂层, 蒙脱土, 改性, 组装

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

收稿日期: 2021-05-28

ZTFLH:

TB332

基金资助:上海市科学技术委员会项目(19DZ2271100)

通讯作者: 张俊喜 E-mail: zhangjunxi@shiep.edu.cn

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

作者简介: 刘煊煊，男，1994年生，硕士生

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引用本文:

刘煊煊, 于金山, 高燕, 赵鹏, 王启伟, 杜卓玲, 张俊喜. APTES改性蒙脱土对镁合金表面杂化溶胶-凝胶涂层防护性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(3): 464-470.
Xuanxuan LIU, Jinshan YU, Yan GAO, Peng ZHAO, Qiwei WANG, Zhuoling DU, Junxi ZHANG. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.119 或 https://www.jcscp.org/CN/Y2022/V42/I3/464

图1 AP-MMT的表面形貌

图2 蒙脱土接枝改性前后XRD和FTIR谱图

图3 不同涂层样品的表面和截面形貌

图4 不同涂层样品的极化曲线

表1 不同涂层样品极化曲线拟合结果

图5 PSG与APSG涂层样品随浸泡时间电化学阻抗谱变化

图6 不同样品在不同浸泡阶段的等效电路

表2 不同涂层样品电化学阻抗谱拟合参数

图7 PSG和APSG涂层样品浸泡15 d后形貌

图8 蒙脱土接枝及对溶胶-凝胶涂层作用机理

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