Interfacial Modification of Clay Nanotubes for the Sustained Release of Corrosion Inhibitors

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• 作者：Anupam Joshi ; Elshad Abdullayev ; Alexandre Vasiliev ; Olga Volkova ; Yuri Lvov
• 刊名：Langmuir
• 出版年：2013
• 出版时间：June 18, 2013
• 年：2013
• 卷：29
• 期：24
• 页码：7439-7448
• 全文大小：812K
• 年卷期：v.29,no.24(June 18, 2013)
• ISSN：1520-5827

文摘

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鈥?loaded tubes were admixed at 5鈥?0 wt % to oil-based alkyd paint providing sustained agent release and corrosion healing in the coating defects. The slow 20鈥?0 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鈥揻ormaldehyde 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鈥揻ormaldehyde copolymer provided an additional increase in corrosion efficiency as a result of the longer release of inhibitors.