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The electrochemical curve of steel substrate (a), epoxy coatings (b), epoxy coatings containing 30-min PAN fibers (c), self-healing composite coatings with different fiber deposition time on the steel substrate: 15-min core-shell fibers (d) and 30-min core-shell fibers (e). When the fiber deposition time was more than half an hour, the current tended to 0 mA and curves coincided, which indicated that self-healing coating are effective.
