Realising the potential of Magnesium (Mg), several globally leading ventures have invested in the Mg industry, but their relatively poor corrosion resistance is a never ending saga till date. The corrosion and bio-corrosion behaviour of Mg has gained research attention and still remains a hot topic in the application of automobile, aerospace and biomedical industries. The intrinsic high electrochemical nature of Mg limits their utilization in diverse application. This scenario has prompted the development of Mg composites with an aim to achieve superior corrosion and bio-corrosion resistance. The present review enlightens the influence of grain size (GS), secondary phase, texture, type of matrix and reinforcement on the corrosion and bio-corrosion behaviour of Mg composites. Firstly, the corrosion and bio-corrosion behaviour of Mg composites manufactured by primary and secondary processing routes are elucidated. Secondly, the comprehensive corrosion and bio-corrosion mechanisms of these Mg composites are proposed. Thirdly, the individual role of GS, texture and corrosive medium on corrosion and bio-corrosion behaviour of Mg composites are clarified and revealed. The challenges encountered, unanswered issues in this field are explained in detail and accordingly the scope for future research is framed. The review is presented from basic concrete background to advanced corrosion mechanisms with an aim of creating interest among the readers like students, researchers and industry experts from various research backgrounds. Indeed, the corrosion and bio-corrosion behaviour of Mg composites are critically reviewed for the first time to: (i) contribute to the body of knowledge, (ii) foster research and development, (iii) make breakthrough, and (iv) create life changing innovations in the field of Mg composite corrosion.

中文翻译：

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了解镁复合材料的腐蚀和生物腐蚀行为——批判性评论

意识到镁 (Mg) 的潜力，几家全球领先的企业纷纷投资镁行业，但迄今为止，其相对较差的耐腐蚀性是一个永无止境的传奇。镁的腐蚀和生物腐蚀行为已引起研究关注，并且仍然是汽车、航空航天和生物医学行业应用的热门话题。镁固有的高电化学性质限制了它们在多种应用中的利用。这种情况促进了镁复合材料的发展，旨在实现优异的耐腐蚀性和生物腐蚀性。本综述揭示了晶粒尺寸（GS）、第二相、织构、基体类型和增强体对镁复合材料腐蚀和生物腐蚀行为的影响。首先，阐明了通过一次和二次加工路线制造的镁复合材料的腐蚀和生物腐蚀行为。其次，提出了这些镁复合材料的综合腐蚀和生物腐蚀机制。第三，阐明和揭示了GS、织构和腐蚀介质对镁复合材料腐蚀和生物腐蚀行为的各自作用。详细解释了该领域遇到的挑战和未解决的问题，并相应地界定了未来研究的范围。该综述从基本的具体背景到先进的腐蚀机制，旨在引起来自不同研究背景的学生、研究人员和行业专家等读者的兴趣。事实上，首次对镁复合材料的腐蚀和生物腐蚀行为进行了严格审查，以：（i）为知识体系做出贡献，（ii）促进研究和开发，（iii）取得突破，以及（iv）创造镁复合腐蚀领域改变生活的创新。