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Recent progress of self-healing coatings for magnesium alloys protection

期刊

JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
卷 19, 期 3, 页码 757-774

出版社

SPRINGER
DOI: 10.1007/s11998-021-00599-2

关键词

Magnesium; Self-healing coating; Nanocontainers; Superhydrophobic

资金

  1. Ministry of Higher Education, Malaysia [FRGS/1/2019/TK05/UMP/02/5]
  2. Universiti Malaysia Pahang [RDU1901128]

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Magnesium (Mg), as the lightest structural metal with compatible biological systems, has been widely used in improving vehicle fuel economy and biodegradable implants. However, the corrosion susceptibility of Mg has been a major concern. To enhance the corrosion resistance of Mg alloys, protective coatings with self-healing properties have been developed, which can release corrosion inhibitors or autonomously self-heal via stimulus controlled-release of embedded nanocontainers.
As the lightest structural metal and having a natural ionic presence with compatible biological systems, magnesium (Mg) has been emphasized in vehicle fuel economy for the automobile industry and is appropriate for biodegradable implants. However, the reactive nature of Mg makes it susceptible to corrosion. The electrochemical instability of Mg is due to long-term hydrogen gas evolution, microgalvanic reaction between the matrix and second phase, presence of impurities, and formation of non-protective corrosion product. Many studies have been done to protect Mg and its alloys from corrosion, and one way to prevent direct contact between magnesium substrate and corrosive medium is by applying a stable coating. Protective coating with self-healing properties has become an efficient technique to improve the corrosion resistance of Mg alloys. A self-healing coating can contain released ion exchange of corrosion inhibitors that could improve the coating stability significantly, while coating with embedded nanocontainers is able to autonomously self-heal via stimulus controlled-release upon crack and damages. In this review, recent studies on functional coating with self-healing ability including layered double hydroxides, cerium conversion coating, plasma electrolytic oxidation, graphene oxide coating, and smart self-healing coating are highlighted in the first section. The nanocontainers containing inhibitor coating and self-healing coating with superhydrophobic and biocompatibility function are reviewed afterward.

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Emerging progress of chemical-based coating for the corrosion protection of magnesium alloys: a review

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Summary: Magnesium (Mg) and its alloys are favored for lightweighting in automotive and biomedical applications due to their excellent biocompatibility and osseointegration properties. However, their poor corrosion resistance restricts their use in many applications, necessitating intensive research to improve their anti-corrosion stability. Protective layer coatings on Mg have been proven to be highly effective in enhancing anti-corrosion stability. This article provides an overview of current chemical-based coatings applied to Mg alloys, including anodizing, plasma electrolytic oxidation, electrodeposition, electroless plating, chemical conversion coating, sol-gel coating, layered double hydroxide, and layer-by-layer assembly. The progress in coating fabrication, corrosion performance breakthroughs, and coating mechanisms and functional perspectives are discussed. As significant advancements have been made in developing corrosion protection approaches for Mg alloys, there is a vast potential for exploring chemical-based coatings. Despite the development of future functional and smart coatings, traditional chemical-based coatings retain comparative functional qualities and require a deeper understanding of aspects such as ease of fabrication, coating strength, and actual anti-corrosion performance.

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