基于纳米容器BTA@MSNs-PAA的智能防腐涂层的制备及性能  

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

作　　者：文家新[1] 张欣[1] 刘云霞[1] 和志强 屈琦超[1] WEN Jiaxin;ZHANG Xin;LIU Yunxia;HE Zhiqiang;QU Qichao(Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]重庆工业职业技术学院,重庆401120

出　　处：《化工进展》2021年第5期2685-2694,共10页Chemical Industry and Engineering Progress

基　　金：重庆市自然科学基金面上项目(cstc2020jcyj-msxmX1067)。

摘　　要：碳钢被广泛应用于工农业生产中,智能涂层的研究和应用为碳钢的腐蚀防护提供了新的途径。本文以正硅酸乙酯(TEOS)为原料,通过加入扩孔剂1,3,5-三甲苯(TMB)合成了大孔径的介孔SiO2纳米容器(MSNs),采用聚丙烯酸(PAA)对MSNs进行化学修饰制备了一种装载缓蚀剂苯并三氮唑(BTA)的pH敏感性智能纳米容器BTA@MSNs-PAA。通过扫描电子显微镜(SEM)、动态光散射粒径分析(DLS)、X射线衍射分析(XRD)、傅里叶红外光谱(FTIR)、热重/差热分析(TGA/DTA)和紫外可见光谱(UV-vis)对BTA@MSNs-PAA的结构和性能进行了表征。通过将BTA@MSNs-PAA掺杂到环氧树脂涂层中,在碳钢表面制备了一种智能防腐涂层,采用电化学阻抗谱(EIS)和盐雾加速腐蚀试验对智能涂层的防腐性能进行了评价。结果表明,BTA@MSNs-PAA近似呈球形且表面光滑,平均粒径为320nm。BTA@MSNs-PAA可通过PAA与BTA之间的静电相互作用装载BTA分子,其装载量可达16.49%,BTA@MSNs-PAA可响应酸性刺激而加速释放BTA分子。基于BTA@MSNs-PAA的智能防腐涂层对碳钢表现出显著的腐蚀防护性能,这可能是因为当碳钢基体发生腐蚀时,其腐蚀点位下降的pH触发纳米容器快速释放BTA分子,从而有效抑制了基体的进一步腐蚀。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.

关 键 词：p H敏感性 纳米容器 智能涂层 碳钢 腐蚀防护 电化学阻抗谱 

分 类 号：TG174.42[金属学及工艺—金属表面处理]