A combined redox-competition and negative-feedback SECM study of self-healing anticorrosive coatings |
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| Authors: | Y. Gonzá lez-Garcí a,S.J. Garcí a,A.E. Hughes,J.M.C. Mol |
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| Affiliation: | aDelft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628CD Delft, The Netherlands;bDelft University of Technology, Novel Aerospace Materials, Kluyverweg 1, 2629HS Delft, The Netherlands;cCSIRO Materials Science & Technology, Private Bag 33, Clayton South MDC, VIC 3169, Australia |
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| Abstract: | In this paper, the long-term anticorrosive efficiency of a damaged self-healing coating is studied for the first time using scanning electrochemical microscopy (SECM). In the study an epoxy-coating with embedded-capsules containing a silyl-ester is employed. The properties of the silyl-ester as a healing-agent for the protection of AA2024-T3 were evaluated by complementary SECM experiments operating in negative-feedback and redox-competition modes. The experimental approach here presented allowed for monitoring the early-stages of corrosion activity and subsequent healing mechanisms offered by the release of silyl-ester into a relatively large coating defect. This result was observed by detecting the transition of the oxygen reduction response from a redox-competition mode to a negative-feedback behavior. These measurements demonstrated that the silyl-ester is released efficiently after capsules break upon coating damage, covering relatively large areas and gradually healing the damaged-site hindering the corrosion processes and providing an effective protection for at least one month of immersion in chloride solution. |
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| Keywords: | Self-healing coating Silyl-ester Encapsulation Corrosion Scanning electrochemical microscopy |
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