掺杂pH敏感性智能纳米容器BTA@MSNs-SO<sub>3</sub>H-PDDA碳钢智能防腐涂层的制备及性能研究

doi:10.11902/1005.4537.2021.039

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 309-316 DOI: 10.11902/1005.4537.2021.039

研究报告

本期目录 | 过刊浏览

掺杂pH敏感性智能纳米容器BTA@MSNs-SO₃H-PDDA碳钢智能防腐涂层的制备及性能研究

文家新¹(

), 张欣¹, 刘云霞¹, 周永福², 刘克建²

^1.重庆工业职业技术学院建筑工程学院重庆 401120
^2.重庆工业职业技术学院化学与制药工程学院重庆 401120

Preparation and Performance of Smart Coating Doped with Nanocontainers of BTA@MSNs-SO₃H-PDDA for Anti-corrosion of Carbon Steel

WEN Jiaxin¹(

), ZHANG Xin¹, LIU Yunxia¹, ZHOU Yongfu², LIU Kejian²

^1.School of Civil Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China
^2.School of Chemistry and Pharmaceutical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China

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摘要:

针对传统有机涂层在使用过程中易出现裂纹或缺陷，从而导致涂层保护提前失效的问题，在构筑富含缓蚀剂BTA的pH敏感性智能纳米容器BTA@MSNs-SO₃H-PDDA的基础上，制备了一种掺杂BTA@MSNs-SO₃H-PDDA的智能防腐涂层。通过扫描电镜、动态光散射粒度分析、X射线衍射分析、Fourier红外光谱、热重分析和紫外可见光谱对BTA@MSNs-SO₃H-PDDA的结构和性能进行了表征。采用电化学阻抗谱和盐雾加速腐蚀实验对智能涂层进行了性能评价。结果表明：BTA@MSNs-SO₃H-PDDA近似呈球形，平均粒径为718 nm，装载BTA的量约为13.37%，可灵敏地响应pH值变化而加速释放BTA分子。基于BTA@MSNs-SO₃H-PDDA的智能涂层对碳钢腐蚀具有显著的智能防护性能。

关键词 ：碳钢, 智能涂层, 纳米容器, 腐蚀防护, pH敏感性

Abstract：

Organic coatings are commonly used as an effective strategy for protecting carbon steel from corrosion, but the traditional organic coatings are susceptible to generate micron cracks or defects during service, resulting in the premature failure. In view of this problem, a novel benzotriazole containing nanocontainers, namely BTA@MSNs-SO₃H-PDDA with pH-sensitivity was prepared firstly, then a BTA@MSNs-SO₃H-PDDA doped smart organic coating was fabricated for application on carbon steel. The structure and performance of BTA@MSNs-SO₃H-PDDA were characterized by scanning electron microscopy (SEM), dynamic light scattering analysis (DLS), X-ray diffraction analysis (XRD), infrared spectroscopy (FT-IR), thermogravimetry (TGA) and ultraviolet-visible spectroscopy (UV-Vis). The protective performance of the smart coatings for carbon steel was evaluated by electrochemical impedance spectroscopy and salt spray accelerated tests. The results showed that the particles of BTA@MSNs-SO₃H-PDDA are near-spherical in shape, with an average diameter of 718 nm. The amount of BTA loaded in BTA@MSNs-SO₃H-PDDA is about 13.37%. The releasing rate of BTA from BTA@MSNs-SO₃H- PDDA can be accelerated via the sensitive response of the pH changes. The prepared smart coating based on BTA@MSNs-SO₃H-PDDA presents remarkable anti-corrosion performance for carbon steel.

Key words： carbon steel smart coating nanocontainers corrosion protection pH-sensitivity

收稿日期: 2021-03-04

ZTFLH:

TG174.42

基金资助:重庆市自然科学基金(cstc2020jcyj-msxmX1067);重庆市教委科学技术研究项目(KJQN202103202)

通讯作者: 文家新 E-mail: 18523976826@163.com

Corresponding author: WEN Jiaxin E-mail: 18523976826@163.com

作者简介: 文家新，男，1983年生，博士，副教授

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引用本文:

文家新, 张欣, 刘云霞, 周永福, 刘克建. 掺杂pH敏感性智能纳米容器BTA@MSNs-SO₃H-PDDA碳钢智能防腐涂层的制备及性能研究[J]. 中国腐蚀与防护学报, 2022, 42(2): 309-316.
Jiaxin WEN, Xin ZHANG, Yunxia LIU, Yongfu ZHOU, Kejian LIU. Preparation and Performance of Smart Coating Doped with Nanocontainers of BTA@MSNs-SO₃H-PDDA for Anti-corrosion of Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 309-316.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.039 或 https://www.jcscp.org/CN/Y2022/V42/I2/309

图1 MSNs和BTA@MSNs-SO3H-PDDA的SEM像

图2 MSNs、MSNs-SO3H和BTA@MSNs-SO3H-PDDA的粒径分布图和XRD谱

图3 MSNs、MSNs-NH2、MSNs-SO3H、MSNs-SO3H-PDDA和BTA@MSNs-SO3H-PDDA的TGA曲线

图4 MSNs、MSNs-NH2、MSNs-SO3H、MSNs-SO3H-PDDA和BTA@MSNs-SO3H-PDDA的FT-IR谱

图5 BTA@MSNs-SO3H-PDDA在不同pH下的释放曲线

图6 掺杂不同量BTA@MSNs-SO3H-PDDA的智能涂层在3.5%NaCl溶液中浸泡不同时间后的电化学阻抗谱

图7 拟合EIS谱的等效电路图

图8 掺杂不同量BTA@MSNs-SO3H-PDDA的智能涂层的Rc值和Rct值随浸泡时间的变化

图9 不同涂层碳钢片在盐雾试验机中连续暴露240 h后的形貌

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