External Self-Healing Coatings in Anticorrosion Applications: A Review

Abstract

Nowadays corrosion has become an urgent problem to be solved. Scientists are committed to finding various ways to restrain the corrosion of metals. The anticorrosion coating is considered to be an economical and effective method. However, the conventional anticorrosion coating is vulnerable to be damaged. The external self-healing coating can release the active healing agent when destroyed and prevent the corrosion spontaneously, which has been the subject of increasing interest. In this paper, the anticorrosion application of external self-healing coatings was described in detail, including organic micro/nanocontainer-based, inorganic micro/nanocontainer-based, and microvascular network-based self-healing coatings. First, the present article introduced the development, preparation, and self-healing properties of the external self-healing coating. In the successive chapter, the anticorrosion performance of the coating was highlighted. Also, some open problems and future challenges were also investigated. Finally, special attention was dedicated to the prospect of the external self-healing coating. This review provides readers with an overview of achievements to date and insights into the future development of engineering applications to promote the large-scale application of external self-healing anticorrosion coatings.

Toward Ceramic Anticorrosion Coatings: A Review

“…The self-healing ceramic coating not only has excellent passive barrier function, but also can realize active defense, which greatly improves the anticorrosion performance and service life of the coating. [177][178][179][180] Figure 21[e]), which is much smaller than that of TiN or Si 3 N 4 . Therefore, the boundary between nanocrystalline and amorphous phases is the main way for Ag to diffuse in TiSiN coatings (Figures 21[a] through [d]).…”

Design of Nanostructured Protective Coatings with a Sensing Function

“…Although mesoporous nanoparticles and nanocapsules can efficiently protect the inhibitors, an irregular distribution in the coating’s matrix can deteriorate the coating structural stability, hence reducing its protective performance . Furthermore, too high concentrations of nanoparticles or nanocapsules in coatings can lead to their deterioration due to the introduction of diffusion pathways for aggressive electrolyte species, resulting in a loss of anticorrosion efficiency …”

“…Although mesoporous nanoparticles and nanocapsules can efficiently protect the inhibitors, an irregular distribution in the coating's matrix can deteriorate the coating structural stability, hence reducing its protective performance. 30 of diffusion pathways for aggressive electrolyte species, resulting in a loss of anticorrosion efficiency. 31 To avoid this issue, nanofibers loaded with inhibitors can be incorporated in coatings.…”

Synthesis of Mn-MOFs loaded zinc phosphate composite for water-based acrylic coatings with durable anticorrosion performance on mild steel

“…Self-healing smart coatings are a new method to solve corrosion problems, which can provide appropriate responses to mechanical and chemical damage. 16 The self-healing ability of polymer coatings is a way to make them smart, which can provide effective corrosion protection for metals without manual intervention. Changes in the external micro-environment (such as pH, magnetic field, electric field, temperature, etc. )…”