Responsive Protection of Magnesium Alloys From Multicorrosive Media by Constructing Nanofluidic Channels in Self-Repairing Coatings

Responsive Protection of Magnesium Alloys From Multicorrosive Media by Constructing Nanofluidic Channels in Self-Repairing Coatings

© 2024 Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 45 vom: 15. Nov., Seite e2409877
1. Verfasser: Yang, Yajie (VerfasserIn)
Weitere Verfasser: Zha, Min, Wang, Dawei, Wang, Tianshuai, Wang, Yufei, Wang, Cheng, Yuan, Ye, Wang, Hui-Yuan
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article coatings covalent organic framework nanofluidic channels responsive protection self‐repairing
Beschreibung
Zusammenfassung:© 2024 Wiley‐VCH GmbH.
Low-density magnesium (Mg) alloys are excellent engineering materials, and can significantly reduce energy consumption by replacing existing steel and aluminum materials. However, Mg species are susceptible to corrosion, especially in harsh environments (high-temperature or acidic), severely limiting the range of practical applications. Here, 2D covalent organic framework (COF) is synthesized with pore diameters ranging from 1.5 to 2.9 nm to obtain ultrafast nanofluidic channels. Loaded with silver (Ag+) ions, 2-mercaptobenzimidazole (2-MB) inhibitors are immobilized in the COF channels through the silver bridges. Based on the strong metal-complexing capability, Ag+ ions precipitated with various corrosive media (Cl-, Br-, I-, SO3 2-, S2-, S2O3 2- SO4 2-, CO3 2-, PO4 3-); meanwhile, the 2-MB inhibitors are rapidly released through the nanofluidic channels, forming a passivation film as a corrosion barrier to protect the Mg substrate. After integration with commercial polyethersulfone (PES), the COF-based coating exhibits high repairing capability achieving 100% damage restoration within 7 h, outperforming all existing coatings of Mg alloys. Notably, the coating shows almost complete protection of Mg alloys after being treated in respective 473 K, acidic (pH ≈4.0), and alkaline (pH ≈10.0) environments
Beschreibung:Date Revised 07.11.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202409877