pH响应的TiO2基纳米容器的制备及缓蚀性能

目的 提高环氧树脂涂层对钢片的耐腐蚀性。方法 采用水热法和NaF刻蚀法合成了中空TiO₂纳米颗粒，以此为材料基底，在TiO₂内部封装了苯并三氮唑（BTA）缓蚀剂，并以正硅酸乙酯（TEOS）和3-氨丙基三乙氧基硅烷（APTES）为硅源，在封装BTA缓蚀剂的TiO₂外表面包覆了硅膜。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FTIR）、X射线光电子能谱仪（EDS）、X射线粉末衍射仪（XRD）、热重分析仪（TGA）及紫外-可见吸收光谱仪（UV-Vis）等，对纳米容器（TiO₂@BTA@SiO₂）的微观形貌、物相和结构进行了表征，并通过UV-Vis测试了纳米容器在不同p H值（2、4、7）下BTA的释放行为。采用极化曲线测定了钢片在不含和含有修饰TiO₂的0.3%Na Cl溶液中不同p H值下的抗腐蚀行为。结果 pH=2时纳米容器中封装的BTA释放率最大，超过90%的BTA在24h内释放出来，腐蚀抑制率为80.7%。经交流阻抗（EIS）测试表明，在浸泡周...

Preparation and Anticorrosion Performance of pH-responsive TiO2 Based Nanocontainers

This paper aims to enhance the anti-corrosion of epoxy coating to steel sheet. The hollow TiO2 nanoparticles were synthesized by hydrothermal reaction and sodium fluoride sculpture. With this TiO2 was used as the substrate to load the corrosion inhibitor azimidobenzene (BTA). The TiO2 outer shell encapsulated with BTA was modified by a silicon dioxide film with ethylsilicate (TEOS) and (3-aminopropyl) triethoxysilane (APTES) as silicon sources. The microstructure, phase and structure were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (EDS), X-ray powder diffractometer (XRD), thermal gravimetric analyzer (TGA) and ultraviolet- visible spectrum (UV-Vis). The release behavior of BTA at different pH values (2, 4, 7) was investigated use ultraviolet-visible spectrum analysis. The anti-corrosion behavior of steel sheets in 0.3% NaCl solutions without and with modified TiO2 at different pH values was measured by polarization curves. The results indicated that when pH values were adjusted to 2, BTA encapsulated in nanocontainers release rate was the highest, approximately 90% of BTA released within 24 h, and the corrosion inhibition rate reached to 80.7%. Studied by using electrochemical impedance spectroscopy (EIS) showed that the epoxy@modified TiO2 coating was basically maintained within one order of magnitude during the soaking period (1~7 d) and it had better corrosion resistance than the blank epoxy coating. In conclusion, the doping of TiO2@BTA@SiO2 nanoparticles improves the corrosion resistance of epoxy resin coating and prolongs the use time of the coating.