Laboratory investigation of smart self-healing coatings based on micro/nanocapsules and optimization of them for inhibition of heavy metals emission to the environment

In this study, a set of smart coatings on the basis of micro/nanocapsules is investigated that release healing agent to the response of damage occurred. This agent is polymerized in presence of air and heals the crack even at the zones that recognition and manual intervention is hard and costly or impossible. The final results of these coatings get from electrochemical impedance spectroscopy were compared with witness coating without capsule. The results show their performance is suitable. Also, three coatings with synthesized capsules for three different agitation rates with the same thickness were compared for obtaining optimum rate. In this rate the thickness was optimized. The negative probable effect of the addition of micro/nanocapsules on coating adhesion to the substrate was investigated with pull off test. The scanning electron microscopy was used to study surface morphology and determine capsule size. The taken images confirm a rough and nonporous surface and suitable size for the capsules.