Advances In Corrosion Control Of Magnesium And Its Alloys

Magnesium (Mg) and its alloys have received widespread acceptance in automobile industries and biomedical applications with substantial recent advancements made in their development, however a significant limitation remains their poor aqueous and galvanic corrosion resistance. This book covers both the fundamentals and recent advancements in two major corrosion protection strategies of magnesium and its alloys, namely, metal-matrix composites and protective coatings. Key features: Covers all aspects of metal-matrix composites and protective coatings for magnesium alloys to improve their corrosion resistance, wear resistance, mechanical properties and biocompatibility Provides the most recent research advancements in the corrosion mitigation strategies of magnesium and its alloys Complete with case studies specific to practical applications, this book serves as a ready reference for graduate students, researchers, engineers and industry professionals in the fields of materials, corrosion science, biofouling and protective coatings.

This book covers fundamentals and recent advancements on conversion coatings for magnesium and its alloys. The contents are presented in two sections, respectively dealing with chemical and electrochemical conversion coatings. The chemical conversion coating section is further subdivided into inorganic conversion coatings, organic conversion coatings and advanced approaches/coatings. The section on electrochemical conversion coatings spans from fundamentals to state-of-the-art progress on electrochemical anodization and plasma electrolytic oxidation of magnesium and its alloys.

Magnesium (Mg) alloys have low corrosion resistance and exhibit unusual corrosion behavior in aqueous environments. Because of this unique corrosion performance, some special corrosion prevention techniques have to be employed for Mg alloys in their applications. This chapter briefly summarizes the corrosion characteristics of Mg alloys, and also presents a strategy and methodologies to mitigate the corrosion damage of Mg alloys in applications.

Corrosion is a surface degradation process determined by an alloy’s surface state, composition and microstructure. This chapter presents an overview of surface processing and alloying techniques that can improve the corrosion resistance of Mg alloys. It is found that some surface engineering processes can significantly change the surface state, composition and microstructure of Mg alloys. For example, surface mechanical and chemical cleaning can effectively remove surface contaminations; burnishing can modify the surface layer’s microstructure including grain size and grain orientation; surface alloying can produce a metallic layer on top of the Mg alloy base material. All these surface engineering processes lead to enhanced corrosion resistance of Mg alloys without affecting their bulk properties.

Magnesium (Mg) and its alloys have received widespread acceptance in automobile industries and biomedical applications with substantial recent advancements made in their development, however a significant limitation remains their poor aqueous and galvanic corrosion resistance. This book covers both the fundamentals and recent advancements in two major corrosion protection strategies of magnesium and its alloys, namely, metal-matrix composites and protective coatings. Key features: Covers all aspects of metal-matrix composites and protective coatings for magnesium alloys to improve their corrosion resistance, wear resistance, mechanical properties and biocompatibility Provides the most recent research advancements in the corrosion mitigation strategies of magnesium and its alloys Complete with case studies specific to practical applications, this book serves as a ready reference for graduate students, researchers, engineers and industry professionals in the fields of materials, corrosion science, biofouling and protective coatings.

Magnesium-based metals, including pure magnesium and its alloys, are becoming increasingly popular in the medical industry due to the fact that they are biodegradable. This chapter briefly introduces the concept of biodegradable magnesium-based metals and their advantages as a new class of metallic biomaterials. Relevant research progress is summarized, especially the corrosion control of magnesium-based metals by appropriate surface modification, which is a key issue for clinical applications.

Anodizing is one of the most widely used surface treatments for magnesium and its alloys. In this electrolytic oxidation process, the surface of a metal is converted to an anodic oxide/hydroxide film with desirable protective, decorative or functional properties. This chapter describes the fundamentals of anodizing treatment, with an emphasis on the difference between magnesium anodizing and aluminum anodizing. The chapter then discusses the most widely used commercial anodic treatments and describes how the treatment conditions affect the corrosion resistance and the physical and mechanical properties of the anodic coating that forms on magnesium alloys. A critical review of recent patents and advances in the anodizing of magnesium is given. After reviewing the literature, the chapter explains how surface treatment can lead to more widespread use of magnesium alloys in a range of industrial applications.

Magnesium (Mg) alloys, possessing good thermal and electrical conductivity, low density, recyclability, high specific strength, and excellent damping capacity, are regarded as one of the most promising light metallic materials. Mg alloys are also known as the “inexhaustible green light engineering material” compared with steel, aluminum, copper, and engineering plastics, providing some important applications in communications, automotive, defense, aerospace, and biomedical industries. However, the low electrode potential causes poor corrosion resistance in the environment of moist air, sulfur, and marine atmosphere. And thus, the corrosion and protection technology of Mg and its alloys is listed as an important research topic in this field. In this Research Topic, the latest research papers on corrosion and protection of Mg and its alloys are collected to provide a platform for researchers and readers to understand the recent developments in this field. Good use of this platform could improve the international research level in corrosion and protection of Mg and its alloys and promote the “green, safe, life-extending and smart” anti-corrosion technology and expand the application range of Mg and its alloys. High-quality Original Research and Review articles in this field are all welcome for submission to this Research Topic. Research interests include but are not limited to the following areas: • Corrosion behaviors and mechanisms • Surface treatment technology • Biodegradable medical applications • High-temperature oxidation • Inhibitors for Mg and its alloys • New monitoring, evaluation, simulation, and prediction methods