Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71270, United States.
ACS Appl Mater Interfaces. 2013 May 22;5(10):4464-71. doi: 10.1021/am400936m. Epub 2013 May 13.
Halloysite clay nanotubes loaded with corrosion inhibitors benzotriazole (BTA), 2-mercaptobenzimidazole (MBI), and 2-mercaptobenzothiazole (MBT) were used as additives in self-healing composite paint coating of copper. These inhibitors form protective films on the metal surface and mitigate corrosion. Mechanisms involved in the film formation have been studied with optical and electron microscopy, UV-vis spectrometry, and adhesivity tests. Efficiency of the halloysite lumen loading ascended in the order of BTA < MBT < MBI; consequently, MBI and MBT halloysite formulations have shown the best protection. Inhibitors were kept in the tubes buried in polymeric paint layer for a long time and release was enhanced in the coating defects exposed to humid media with 20-50 h, sufficient for formation of protective layer. Anticorrosive performance of the halloysite-based composite acrylic and polyurethane coatings have been demonstrated for 110-copper alloy strips exposed to 0.5 M aqueous NaCl for 6 months.
负载缓蚀剂苯并三氮唑 (BTA)、2-巯基苯并咪唑 (MBI) 和 2-巯基苯并噻唑 (MBT) 的埃洛石纳米管被用作铜自修复复合涂料的添加剂。这些抑制剂在金属表面形成保护膜，减轻腐蚀。通过光学和电子显微镜、紫外可见光谱和附着力测试研究了成膜机制。纳米管腔负载的效率按 BTA < MBT < MBI 的顺序增加；因此，MBI 和 MBT 埃洛石配方表现出最佳的保护效果。抑制剂被封存在埋在聚合物涂料层中的纳米管中，可以在暴露于 20-50 小时的潮湿介质中的涂层缺陷中保持很长时间，并增强释放，足以形成保护层。用负载有缓蚀剂的埃洛石基复合丙烯酸酯和聚氨酯涂料对暴露于 0.5 M 水溶液的 110 铜合金带进行了为期 6 个月的实验，结果表明该涂料具有良好的防腐性能。
