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Cathodic Disbonding of Self-healing Composite Coatings: Effect of Ethyl Cellulose Micro/nanocapsules by Sogand Abbaspoor; Ali Ashrafi; Mehdi Salehi is a Materials Science article available to read on EtoBox.

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The effect of ethyl cellulose (EC) micro/nanocapsules containing linseed oil (LO) on the cathodic disbonding of self-healing composite coatings is investigated by cathodic disbonding test and electrochemical impedance spectroscopy (EIS). Results reveal that the presence of EC nanocapsules significantly improves the cathodic disbonding resistance of the coatings so that the rates of disbonded area under the simulated condition of cathodic protection decrease from 3.882 mm 2 h for the blank coating to 0.025 mm 2 h for the nanocapsules containing coating. It may be ascribed to the releasing LO and filling the defects at the coating/substrate interface by oxidative polymerisation mechanism. EIS test results indicate that the corrosion resistance of the coatings is improved in the presence of EC nanocapsules. In addition, the coating resistance to cathodic disbonding and corrosion increase by decreasing capsule sizes. Finally, a proposed mechanism of ion diffusion through the self-healing coating's defect is schematically illustrated.

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Author

Sogand Abbaspoor; Ali Ashrafi; Mehdi Salehi

Publisher

Informa UK Limited

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)