Preparation and performance of smart anti-corrosion coating based on nanocontainers of BTA@MSNs-PAA

被引：0

作者：

Wen J. ^{[1
]}

Zhang X. ^{[1
]}

Liu Y. ^{[1
]}

He Z. ^{[1
]}

Qu Q. ^{[1
]}

机构：

[1] Chongqing Industry Polytechnic College, Chongqing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 05期

关键词：

Carbon steel; Corrosion protection; Electrochemical impedance spectroscopy; Nanocontainers; PH-sensitivity; Smart coating;

D O I：

10.16085/j.issn.1000-6613.2020-1087

中图分类号：

学科分类号：

摘要：

Carbon steel is widely utilized in industrial and agricultural processes. The study and application of the smart coating provide a new approach for the corrosion protection of carbon steel. In this work, mesoporous silica nanocontainers (MSNs) with large pore size were synthesized by using tetraethyl orthosilicate (TEOS) as the reactant through the addition of the pore-expanding agent of 1, 3, 5-trimethylbenzene (TMB). The prepared MSNs were modified by poly(acrylic acid) (PAA) to obtain the intelligent nanocontainers of BTA@MSNs-PAA with pH-sensitivity. The structure and performance of BTA@MSNs-PAA were characterized by scanning electron microscopy (SEM), dynamic light scattering analysis (DLS), X-ray diffraction analysis, infrared spectroscopy (FTIR), thermogravimetry/differential thermal analysis (TGA/DTA), and ultraviolet-visible spectroscopy (UV-vis). Meanwhile, the smart coating was fabricated on carbon steel through the dispersion of BTA@MSNs-PAA into epoxy resin. The protective properties of the smart coatings were evaluated by electrochemical impedance spectroscopy and salt spray accelerated experiments. The results showed that BTA@MSNs-PAA presented a near-spherical and smooth surface with an average diameter of 320nm. BTA@MSNs-PAA could load BTA by electrostatic interaction between PAA and BTA molecules. The amount of BTA loaded in BTA@MSNs-PAA is up to 16.49%. The releasing rate of BTA from BTA@MSNs-PAA can be accelerated under acidic conditions. The prepared coating presents remarkable anti-corrosion performance for carbon steel in NaCl corrosion medium, which may be because the releasing of BTA from BTA@MSNs-PAA is triggered by corrosion-induced pH decrease. Therefore, it can prevent the further corrosion of carbon steel substrate. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：2685 / 2694

页数：9

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