Self-healing coating enhanced by attapulgite (ATP) functionalised MXene with inhibitor integration
Improved self-healing combined with improved mechanical and adhesives properties have been achieved by grafting ATP nanorods on NH2-Ti3C2Tx nanosheets. The combination of two types of inhibitors promotes self-healing and passive defense.
Improved self-healing combined with improved mechanical and adhesives properties have been achieved by grafting ATP nanorods on NH2-Ti3C2Tx nanosheets. The combination of two types of inhibitors promotes self-healing and passive defense.
Ti3C2Tx nanosheets, emerging as revolutionary 2D nanomaterials, have sparked interest in advanced applications due to their thin-layered architecture and promise as innovative nanofillers for a variety of applications. To address the oxidation and stacking of Ti3C2Tx nanosheets with the polymer, a novel multifunctional Ti3C2Tx-based nanocomposite is engineered by an etching method. The Ti3C2Tx surface is functionalised with 3-aminopropyltriethoxysilane (APTES), and attapulgite (ATP) is implanted on the NH2-Ti3C2Tx interface to lower the cohesive energy between nanosheets.
The novel self-healing epoxy films were achieved by encapsulating self-healing components ((8-hydroxyquinoline (8-HQ) + 2-mercaptobenzothiazole (MBT)) in the ATP-based NH2-Ti3C2Tx nanocomposite (AMQM). Inhibited coating sample AA2024-T3 surface revealed hydrophobic nature, whereas the pH sensitive coatings exhibited strong adherence to the substrate and improved compatibility and mechanical strength.
The impedance of artificially scratched epoxy film rose from 0.073 M Ω cm2 to 0.198 M Ω cm2 (after 12 h) and from 0.027 M Ω cm2 to 2.189 M Ω cm2 (after 96 h) in comparison with the control samples. Simulations depict the presence of hydrogen bonds between the inhibitors and the AA2024-T3 alloy, as well as twice the adsorption energy compared to the individual inhibitors. Therefore, a novel pH-sensitive self-healing coating offers a synergistic approach for promising corrosion suppression.
Source: Progress in Organic Coatings Volume 199, February 2025, 10893
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