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Abstract
The self-repairing polymer coating based on microencapsulated epoxy resin agent and catalyst was prepared. Defects in the coating were successfully healed when epoxy resin was released from the microcapsules, which were ruptured under simulated mechanical action. Polymer healed area was found to prevent corrosion of the substrate, which was analysed by scanning electron microscopy. The healing efficiency was determined using electrochemical impedance spectroscopy. The local corrosion activity of the damaged coating on the carbon steel was evaluated. The impedance spectroscopy of the self-healing coating showed measurable improvements of anticorrosion performance after defect creation.
Acknowledgements
The project was supported by the National Science and Technology Supporting Project of China (grant nos. 2011BAF11B07 and 2011BAC10B05), the Natural Science Foundation of China (grant no. 50775222) and the Foundation of Key Laboratory for Advanced Materials Processily Technology, Ministry of Education (grant no. 2010004).