Abstract
The use of self-healing coatings to protect metal substrates, such as aluminum alloys, stainless steel, carbon steel, and Mg alloys from corrosion is an important aspect for protecting metals and for the economy. During the past decade, extensive transformations on self-healing strategies were introduced in protective coatings, including the use of green components. Scientists used extracts of henna leaves, aloe vera, tobacco, etc. as corrosion inhibitors, and cellulose nanofibers, hallyosite nanotubes, etc. as healing agent containers. This review gives a concise description on the need for self-healing protective coatings for metal parts, the latest extrinsic self-healing strategies, and the techniques used to follow-up the self-healing process to control the corrosion of metal substrates. Common techniques, such as accelerated salt immersion test and electrochemical impedance spectroscopy (EIS), for evaluating the self-healing process in protective coatings are explained. We also show recent advancements procedures, such as scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM), as successful techniques in evaluating the self-healing process in protective coatings.
Highlights
It is important to protect the surface of metals against corrosion
Fan et al [55] used a multilayer structure of graphene oxide (GO) with branched poly(ethylene mine) (PEI)/ poly(acrylic acid) (PAA) to protect magnesium alloy
New generation of self-healing protective coatings confirmed their candidature as alternative anti-corrosion coatings
Summary
It is important to protect the surface of metals against corrosion. A widely accepted protection method is the use of a suitable coating, which can protect the surface of the metal from the environment. Hybrid coatings with titania as the inorganic component have been reported in sol-gel coating films and nanocomposites coatings [6,7]. The combination of these two types of materials will ensure good mechanical properties, flexibility, adhesion, and transparency. The self-healing coating concept has been introduced as a novel approach for achieving the corrosion protection function. Depending on the end use applications, the follow-up methods that were adopted to evaluate the healing process are important and those will be discussed
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