Self-Healing Coatings

Abstract

The development of protective coatings can effectively improve the corrosion resistance of Mg alloys. However, unavoidable collisions and scratches cause partial damage of the coating during service, resulting in pitting corrosion. Therefore, active self-healing coatings are highly desired to ensure coating integrity to provide durable and reliable corrosion protection. It is thus of importance to analyze and summarize the most recent progress to boost the development and practical applications of self-healing coatings. This chapter begins with the general self-healing mechanism, including autonomous and non-autonomous self-healing coatings. The self-healing coatings on Mg alloys are mainly based on the corrosion inhibitors, which can be directly encapsulated into a coating matrix or embedded in nanocontainers to effectively avoid unwanted reactions between inhibitors and coatings to guarantee the inhibition efficiency. Moreover, a slippery liquid-infused porous surface, with good self-healing property because of the good fluidity of liquid lubricants, is also widely applied on Mg alloys to realize the self-healing performance. The future perspectives are finally discussed based on the state-of-the-art research.