Design and Fabrication of a Novel Stimulus-Feedback Anticorrosion Coating Featured by Rapid Self-Healing Functionality for the Protection of Magnesium Alloy

Abstract

Corrosion potential stimulus-responsive smart nanocontainers (CP-SNCs) are designed and synthesized based on the installation of the supramolecular assemblies (bipyridinium ⊂ water-soluble pillar[5]arenes) onto the exterior surface of magnetic nanovehicles (FeO@mSiO), linked by disulfide linkers. The supramolecular assemblies with high binding affinity as gatekeepers effectively block the encapsulated organic corrosion inhibitor, 8-hydroxyquinoline (8-HQ), within the mesopores of FeO@mSiO. When the corrosion potential of the magnesium alloy (-1.5 V vs SHE) is exerted, 8-HQ is released instantly because of the cleavage of disulfide linkers and the removal of the supramolecular assemblies. CP-SNCs were incorporated into the hybrid organic-inorganic sol-gel coating to construct a corrosion potential stimulus-feedback anticorrosion coating (CP-SFAC) that was then deposited on the magnesium alloy, AZ31B. With the aid of a magnetic field, CP-SNCs were gathered in the proximity of the surface of AZ31B. CP-SFAC showed a satisfactory anticorrosion performance, more importantly, through the evaluation of microzone electrochemical techniques. CP-SFAC presented the rapid self-healing functionality when the localized corrosion occurred. Shortening the distance between CP-SNCs and the surface of AZ31B enhances the availability of the incorporated CP-SNCs and makes most of the CP-SNCs to timely respond to the corrosion potential stimulus and facilitates the formation of a compact molecular protective film before the corrosion products pile up. The characteristics of fast response time and quick self-healing rate meet the requirements of the magnesium alloy for self-healing in local regions.

Redox‐Responsive Polymer with Self‐Immolative Linkers for the Release of Payloads

“…Thus, while the metal is oxidized the cathodic reduction shall lead to a reduction of the polymer synthesized in this study. A previous report has also shown that disulfide bonds embedded in silica could be cleaved upon onset of magnesium corrosion as the corrosion potential of magnesium alloy was exerted …”

Flourishing Self‐Healing Surface Materials: Recent Progresses and Challenges

“…A mesoporous type silica nanocontainers with smart self‐healing and anticorrosion properties have been obtained by assembling the supramolecular assemblies onto the external surface of Fe 3 O 4 @mSiO 2 magnetic nanovehicle . The mechanism of stimulus‐feedback anticorrosion coating with self‐healing function is depicted in Figure a.…”

“…a) Schematic illustration of self‐healing anticorrosion mechanism. Reproduced with permission . Copyright 2017, American Chemical Society.…”

Gated Materials: Installing Macrocyclic Arenes‐Based Supramolecular Nanovalves on Porous Nanomaterials for Controlled Cargo Release

“…Beside biological applications, Fu et al reported nanovalve‐gated core‐shell nanomaterials for the storage and controlled release of the corrosion inhibitor, 8‐hydroxyquinoline (8‐HQ) . Fe 3 O 4 nanoparticles were coated with MSN shells, on which disulfide‐ and methyl viologen‐containing stalks were anchored.…”

“…Beside biological applications, Fu et al reported nanovalvegated core-shell nanomaterials for the storage and controlled release of the corrosion inhibitor, 8-hydroxyquinoline (8-HQ). [50] Fe 3 O 4 nanoparticles were coated with MSN shells, on which www.advancedsciencenews.com www.biotechnology-journal.com disulfide-and methyl viologen-containing stalks were anchored. The exertion of an external magnetic field could gather the hybrid nanocontainers near the surface of the magnesium alloy.…”