Co-Al hydrotalcite assembled nanofibers to enhance corrosion inhibition and effective Cl− adsorption for long-term corrosion protection

Cao, Lin; Piao, Jinming; Wang, Wei; Fan, Weijie; Han, Dongxiao; Pei, Yantong; Chen, Ye; Zhang, Yue

doi:10.1016/j.cej.2024.153052

Cited by 2 publications

(1 citation statement)

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“…Corrosion inhibitors are promising candidates to be incorporated into organic coatings for active corrosion protection with a low dosage and high inhibition efficiency. ,− A variety of corrosion inhibitors have been incorporated into the protective coating formulation, including inorganic ones, like chromates, cerium salts, phosphates, and zincates, as well as organic ones, such as heterocyclic compounds, amine substances, quaternary ammonium salts, and carboxylic acid salts. Despite their excellent inhibition performance, it is still a formidable task to develop inhibitors that combine superior inhibition efficiency and low cost .…”

Section: Introductionmentioning

confidence: 99%

Construction of Smart Coatings Containing Core–Shell Nanofibers with Self-Healing and Active Corrosion Protection

Wang,

Cao,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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With increasingly severe metal corrosion, coating preparation with highperformance corrosion protection has attracted more attention. Herein, the encapsulation of the corrosion inhibitor 8-hydroxyquinoline (8-HQ) as well as the self-healing agent linseed oil (LO) in polyvinyl alcohol (PVA) and chitosan (CS) shells were realized by coaxial electrospinning, which was recorded as PVA/CS@LO/8-HQ core−shell nanofibers. PVA/CS@LO/8-HQ nanofibers were employed to promote the high-performance corrosion protection of the epoxy coating. The anticorrosion mechanism was that the change of the local pH on the metal surface stimulated the release of 8-HQ from the nanofibers, which were then chelated with iron ions to form a complex. When cracks occurred and caused rupture of the nanofibers, LO was released and reacted with oxygen to cure them so that the cracks could be healed autonomously. The dynamic potential polarization curves showed that the corrosion inhibition efficiency of the compound inhibitor LO + 8-HQ reached 87.54%, 90.31%, and 85.57% at pH = 3, 7, and 11, respectively, higher than that of the single corrosion inhibitor. Density functional theory calculations revealed that the LO and 8-HQ combination, forming a hydrogen bond interaction, promoted the adsorption of inhibitors on the steel surface. Scanning Kelvin probe and electrochemical impedance spectroscopy proved the self-healing corrosion protection properties of the epoxy coating. These results demonstrated that embedding PVA/CS@LO/8-HQ nanofibers in the coating could obtain selfhealing properties, and promote the mechanical and corrosion protection of epoxy coating.

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