Novel self-healing anticorrosion coating based on L-valine and MBT-loaded halloysite nanotubes

This work creatively utilized the pH-dependent electrostatic interactions between L-valine (L-Val) and halloysite nanotubes (HNTs) to fabricate pH-responsive anticorrosion materials and compared with 2-mercaptobenzothiazole (MBT)-loaded HNTs, which were assembled via layer-by-layer (LbL) self-assemb...

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Bibliographic Details
Published in:	Journal of materials science 2018-05, Vol.53 (10), p.7793-7808
Main Authors:	Dong, Chundong, Zhang, Manxin, Xiang, Tengfei, Yang, Ling, Chan, Wenming, Li, Cheng
Format:	Article
Language:	eng
Subjects:	Amino acids Atomic absorption analysis Atomic beam spectroscopy Characterization and Evaluation of Materials Chemistry and Materials Science Classical Mechanics Coatings Comparative analysis Control methods Controlled release Corrosion inhibitors Corrosion prevention Crystallography and Scattering Methods Electrochemical impedance spectroscopy Epoxy resins Materials Science Mercaptobenzothiazole Metals Nanotubes Polymer Sciences Self healing materials Self-assembly Sodium chloride Solid Mechanics Spectrophotometry Spectrum analysis Submerging Valine
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Summary:	This work creatively utilized the pH-dependent electrostatic interactions between L-valine (L-Val) and halloysite nanotubes (HNTs) to fabricate pH-responsive anticorrosion materials and compared with 2-mercaptobenzothiazole (MBT)-loaded HNTs, which were assembled via layer-by-layer (LbL) self-assembly. These two methods can achieve controlled release of inhibitors and self-healing performance. However, the loading capacity of L-Val-loaded HNTs is higher than that of MBT’s. There are 12 and 7 wt%, respectively. The pH-responsive release property was systematically evaluated by ultraviolet–visible (UV/Vis) spectrophotometry measurement. It demonstrates that 98% of adsorbed L-Val molecules released from HNTs within 300 min at pH 10 while the loaded MBT needs 120 h to achieve the equal ratio. Moreover, the difference of the release rate has a significant impact on the artificial crossed scratch experiment and shows a great performance gap in photographs. By comparing electrochemical impedance spectroscopy (EIS) data of three epoxy coatings, it can be seen that the epoxy coating, which was mixed with L-Val-loaded HNTs, shows a better anticorrosion ability than the epoxy coating contains MBT-loaded HNTs after immersion in 3.5 wt% sodium chloride solution for 96 h. Crucially, the pH-responsive anticorrosion material we fabricated can offer a rapid self-healing performance when the coating damaged by mechanical scratch via visual test and atomic absorption spectroscopy.
ISSN:	0022-2461 1573-4803