Anticorrosion Coatings with Self-Healing Effect Based on Nanocontainers Impregnated with Corrosion Inhibitor

Abstract

The development of active corrosion protection systems for metallic substrates is an issue of prime importance for many industrial applications. The present work shows a new contribution to the development of a new protective system with self-healing ability composed of hybrid sol−gel films doped with nanocontainers that release entrapped corrosion inhibitor in response to pH changes caused by corrosion process. A silica−zirconia based hybrid film was used in this work as an anticorrosion coating deposited on 2024 aluminum alloy. Silica nanoparticles covered layer-by-layer with polyelectrolyte layers and layers of inhibitor (benzotriazole) were randomly introduced into the hybrid films. The hybrid film with the nanocontainers reveals enhanced long-term corrosion protection in comparison with the undoped hybrid film. The scanning vibrating electrode technique also shows an effective self-healing ability of the defects. This effect is obtained due to regulated release of the corrosion inhibitor triggered by the corrosion processes started in the cavities. The approach described herein can be used in many applications where active corrosion protection of materials is required.

Self-healing coatings in anti-corrosion applications

“…The capsules are filled in different ways, e.g. by agitating the suspension of capsules and fillers, also under reduced pressure, the soaking of capsules in inhibitor solution and by applying the LBL deposition procedure [27,54,56,70]. In the case of soaking encapsulation, different inhibitor retention mechanisms can be distinguished.…”

Construction and evaluation of nitric oxide generating vascular graft material loaded with organoselenium catalyst via layer-by-layer self-assembly

“…The content of Se increased rapidly for the first three bilayers but relatively slowly for the next five bilayers, and reached a maximum amount of 1.5310 3 μg L 1 cm 2 on each piece of film (diameter 1 cm) after the eighth bilayer. The content decreased at the ninth bilayers a bit, probably due to self-healing of electrostatic assembly film, which is that the surface charge density may reach a constant after several depositions [41].…”

Review of research and developments in self healing composite materials

“…Figure 9. Schematic illustration of the coating morphology and the shape memory assisted self-healing (SMASH) concept [35] Mikhail L. Zheludkevich et al [36] Another methodology for disintegration movement on request is proposed in this work giving insightful self-recovering ability to the mutt sol-gel guarded films. Controllable transport is refined combining nano-compartments of benzotriazole inhibitor in the half and half pretreatments.…”