Ce^(3+)掺杂聚苯胺中空微球/环氧涂层防腐蚀研究  

Anticorrosion study of epoxy coating with Ce^(3+) doped polyaniline hollow microspheres

作　　者：李芝华[1] 胡建康 李彦博 郑峰[1] 刘军[1] LI Zhihua;HU Jiankang;LI Yanbo;ZHENG Feng;LIU Jun(School of Materials Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《材料科学与工艺》2018年第3期23-30,共8页Materials Science and Technology

基　　金：国家自然科学基金资助项目(51472271)

摘　　要：聚苯胺作为一种新型的防腐蚀材料,在钢铁防腐蚀领域具有良好的应用前景.通过自组装法在聚(2-丙烯酰胺基-2-甲基丙磺酸)(PAMPS)水溶液中制备了聚苯胺(PANI)中空微球,将稀土Ce^(3+)掺杂到聚苯胺中空微球表面制备了一种新型的Ce^(3+)掺杂修饰的聚苯胺中空微球(PANI-Ce^(3+)).以PANI-Ce^(3+)中空微球为防腐填料添加到环氧树脂(EP)中,制备Ce^(3+)掺杂修饰的聚苯胺中空微球/环氧(PANI-Ce^(3+)/EP)防腐涂层.采用FT-IR、UV-Vis、SEM、XRD等对PANI-Ce^(3+)中空微球进行表征,通过动电位极化法、交流阻抗测试探究PANI-Ce^(3+)/EP涂层的防腐蚀性能.结果表明:PANI-Ce^(3+)/EP涂层具有较高的腐蚀电压(Ecorr=-0.414 V)和较小的腐蚀电流密度(I_(corr)=0.676×10^(-5)μA/cm^2);PANI-Ce^(3+)/EP涂层低频区阻抗模量随浸泡时间呈现先减小后增大的变化趋势,在质量分数3.5%的NaCl水溶液中经过1 680 h腐蚀后,阻抗模量保持在106.6Ω·cm^2;表面有划伤的PANI-Ce^(3+)/EP涂层在质量分数3.5%的Na Cl水溶液进行1 680 h腐蚀实验后,涂层表面不起泡,仅在划痕处有少量铁锈.PANI-Ce^(3+)/EP涂层表现出优异的耐腐蚀性能.As a kind of novel anticorrosion materials,polyaniline（PANI） exhibits great potentials in the field of steel anticorrosion. PANI hollow microspheres were fabricated by self-assembly method in poly（2-acrylamido-2-methylpropanesulfonic acid）（PAMPS） aqueous solution. After then,Ce^3＋ions were loaded onto PANI to prepare Ce^3＋doped PANI（PANI-Ce^3＋） hollow microspheres. PANI-Ce^3＋hollow microspheres were employed as functional additives and dispersed in epoxy resin（EP）. Structure and morphology of PANI-Ce^3＋hollow microspheres were characterized by Fourier transform infrared spectroscopy（FT-IR）,scanning electron microscopy（SEM）,X-ray diffraction（XRD） and transmission electron microscopy（TEM） etc. Electrochemical impedance spectroscopy（EIS） and potentiodynamic polarization test were employed to analyze anticorrosion performance of PANI-Ce^3＋/EP coatings explored in 3.5 wt.% Na Cl aqueous solution for 1 680 hours. Tafel plots showed that PANI-Ce^3＋/EP coating exhibited high corrosion potential（Ecorr=-0.414 V） and small corrosion current density（I（corr）= 0.676×10^-5μA/cm2）. In addition,Bode plots showed that impedance in low frequency region decreased firstly and then increased with soaking time. Impedance values were maintained at 106.6Ω·cm^2 explored in 3.5 wt.% Na Cl aqueous solution for 1 680 hours. Meanwhile,no blister was observed and corrosion just occurred around the scratches after PANI-Ce^3＋/EP coatings with scratches on the surface were explored in 3. 5 wt.% Na Cl aqueous solution for 1 680 hours,indicating their excellent anticorrosion performances.

关 键 词：聚苯胺中空微球 Ce^3+掺杂 涂层 耐腐蚀性能 自组装法 

分 类 号：TQ637[化学工程—精细化工]