Interfacial Modification of Clay Nanotubes for the Sustained Release of Corrosion Inhibitors
Interfacial Modification of Clay Nanotubes for the Sustained Release of Corrosion Inhibitors
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DOI：
10.1021/la3044973
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发表时间：
2013-06-18
期刊：
影响因子：
3.9
通讯作者：
Lvov, Yuri
中科院分区：
文献类型：
--
作者：
Joshi, Anupam;Abdullayev, Elshad;Lvov, Yuri
以埃洛石纳米管为载体，分别负载苯并三氮唑、巯基苯并噻唑和巯基苯并咪唑三种缓蚀剂，制备了钢铁长效防腐蚀涂料。将装载有抑制剂的管以5-10重量%混合到油基醇酸漆中，从而在涂层缺陷中提供持续的试剂释放和腐蚀愈合。缓蚀剂在缺陷处缓慢释放20-30 h，可显著提高涂层的防腐蚀性能。通过在碳纳米管末端与脲醛共聚物和铜-缓蚀剂络合形成释放阻挡物，实现了防腐蚀剂释放的进一步时间扩展。在0.5M NaCl溶液中，通过显微镜检查和研究油漆附着力，用腐蚀电流发展的微扫描测试ASTM A366钢板的腐蚀保护效率。最好的保护，发现使用埃洛石/巯基苯并咪唑和苯并三唑抑制剂。用脲甲醛共聚物形成的塞子由于抑制剂的较长释放而提供了腐蚀效率的额外增加。
Long-lasting anticorrosive coatings for steel have been developed on the basis of halloysite nanotubes loaded with three corrosion "inhibitors: benzotriazole, mercaptobenzothiazole, and mercaptobenzimidazole. The inhibitors' loaded tubes were admixed at 5-10 wt % to oil-based alkyd paint providing sustained agent release and corrosion healing in the coating defects. The slow 20-30 h release of the inhibitors at defect points caused a remarkable improvement in the anticorrosion efficiency of the coatings. Further time expansion of anticorrosion agent release has been achieved by the formation of release stoppers at nanotube ends with urea formaldehyde copolymer and copper-inhibitor complexation. The corrosion protection efficiency was tested on ASTM A366 steel plates in a 0.5 M NaCl solution with the microscanning of corrosion current development by microscopy inspection and studying paint adhesion. The best protection was found using halloysite/mercaptobenzimidazole and benzotriazole inhibitors. Stopper formation with urea formaldehyde copolymer provided an additional increase in corrosion efficiency as a result of the longer release of inhibitors.