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- W4384501654 abstract "The cross-linked conducting polypyrrole hydrogel (CPH) network is designed for preparing the corrosion-resistant and self-healing epoxy coatings, which are used for the long-term active corrosion control of Mg alloys substrate in 3.5 wt.% NaCl solution. The encapsulated phytic acid (PA) inhibitors are uniformly distributed in the crosslinked CPH network with an encapsulation amount of 16.77%. The inductively coupled plasma–optical emission spectrometry test indicates that the releasing rate of the PA inhibitors from the crosslinked CPH network rises with the increased pH values, reflecting their pH-responsive feature. Afterward, the epoxy coatings impregnated with various contents of the CPH network are coated on the Mg alloy surface, and their corrosion resistance and self-healing performances are evaluated using electrochemical and immersion tests. Results indicate that the epoxy coatings with 5 wt.% CPH displays the most durable corrosion-resistant and self-healing performances with the highest coating resistance (4.39 × 105 Ω cm2) and charge-transfer resistance (8.28 × 105 Ω cm2) values even after 28 days of immersion. The encapsulated PA inhibitors continuously release to the cracked region in response to the local pH variations and react with Mg2+ ions generated from the active corrosion site. Consequently, an Mg-PA protective layer is formed to suppress further corrosion activities. Both the enhanced inherent barrier effect of epoxy coatings, the pH-responsive release behaviors of the PA inhibitors from crosslinked CPH network and the durable anodic protection effect of CPH are beneficial for improving the anti-corrosive performance of the epoxy coatings. It is believed that this kind of crosslinked CPH network will provide a new strategy for designing highly self-healing and anti-corrosive performance of epoxy coatings for the active corrosion control of other metals." @default.
- W4384501654 created "2023-07-18" @default.
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- W4384501654 date "2023-10-01" @default.
- W4384501654 modified "2023-10-16" @default.
- W4384501654 title "Intelligent self-healing anti-corrosive coatings with crosslinked conducting polypyrrole hydrogel network" @default.
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- W4384501654 doi "https://doi.org/10.1016/j.colsurfa.2023.132078" @default.
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