Self-Healing Epoxy Coating Modified by Double-Walled Microcapsules Based Polyurea for Metallic Protection

Abstract:

The effectiveness of preploymer and 1,6-Hexamethylene diamine encapsulated by double-walled microcapsules based polyurea (PUA) was explored for healing the cracks generated in epoxy coatings. Double-walled microcapsules were systhesized by interfacial polymerization at the interface between the prepolymer droplets and the 1,6-Hexamethylene diamine droplets to form the polyurea shell. The effect of synthetic stirring speed on the morphology of the microcapsules was observed by scanning electronmicroscopy (SEM) and optical microscopy (OM). The chemical structure as well as the thermal properties and the core content were characterized by Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric analyzer (TGA) respectively. Electrochemical impedance spectroscopy (EIS) studies of the artificial scratched area showed that the coating containing 2wt% and 5wt% microcapsules could effectively prevent further corrosion of the coating with high corrosion resistance efficiencies of 61.61% and 45.99% after immersing for 144h in seawater.

• Periodical: Key Engineering Materials (Volume 821)
• Pages: 313-320
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.821.313
• Online since: September 2019
• Authors: Yan Xuan Ma*, Yingrui Zhang, Jia Tong Liu, Meng Yao Li, Ya Qian Xu
• Keywords: Corrosion Resistance, Double-Walled Microcapsules, Polyurea, Self-Healing Coating

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