摘要
采用苯骈三氮唑(BTA)改性八苯基倍半硅氧烷(OPS)。通过红外光谱仪和热重分析仪对BTA、OPS和BTA改性OPS(简称BO)进行了测试,发现BTA改性后的OPS在耐热性能上得到了提高。将BTA、OPS和BO分别加到环氧树脂中制备了不同涂料。以金相显微镜和水滴角测试仪考察了它们的表面形貌和水接触角,用电化学工作站测试了它们在3.5%NaCl溶液中的极化曲线和电化学阻抗谱,并对涂层的防腐机理进行了探讨。结果表明,添加BTA、OPS和BO的涂层的表面形貌大大改善,水接触角增大,腐蚀电流密度降低2-3个数量级。其中,加了BO的涂层表面几乎没有微孔,水接触角最大(达到81°),腐蚀电流密度最小,电荷转移电阻和涂层电阻最大,具有较好的耐蚀性。
Octaphenylsilsesquioxane(OPS)was modified by benzotriazole(BTA).The BTA-modified OPS(coded as BO),BTA,and OPS were characterized by infrared spectrometry and thermogravimetry.It was found that the heat resistance of OPS was improved by modification with BTA.Different coatings were prepared by adding BTA,OPS,and BO to epoxy resin respectively.Their surface morphologies and water contact angles were examined using metallograph and contact angle meter,and their polarization curves and electrochemical impedance spectra in 3.5%NaCl solution were measured using electrochemical workstation.The anticorrosion mechanisms of the coatings were discussed.The results showed that the surface morphologies of the coatings containing BTA,OPS,and BO are greatly improved,their water contact angles are increased greatly,and their corrosion current densities are decreased by 2 or 3 orders of magnitude.For the BO-containing coating,there are almost not micropores at its surface,and it had not only the largest water contact angle,which reaches 81°,but also the lowest corrosion current density as well as the largest charge transfer resistance and coating resistance,showing good hydrophobicity and corrosion resistance.
作者
王继虎
李何青
杨靖霞
毛岩
于相毅
WANG Jihu;LI Heqing;YANG Jingxia;MAO Yan;YU Xiangyi(College of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Solid Waste and Chemical Management Technology Center of Ministry of Ecological Environment,Beijing 100029,China)
出处
《电镀与涂饰》
CAS
北大核心
2021年第8期641-647,共7页
Electroplating & Finishing
基金
科技部重点研发计划专项(2018YFC1801503)。
关键词
环氧涂料
改性
苯骈三氮唑
八苯基倍半硅氧烷
耐蚀性
电化学
epoxy paint
modification
benzotriazole
octaphenylsilsesquioxane
corrosion resistance
electrochemistry
