[PDF] Corrosion Prevention Of Magnesium Alloys eBook

Author : Guang-Ling Song
Publisher : Woodhead Publishing
Page : 586 pages
File Size : 35,34 MB
Release : 2017-11-13
Category : Technology & Engineering
ISBN : 9780081015971

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Magnesium (Mg) alloys are receiving increasing attention due to their abundance, light weight, castability, formability, mechanical properties and corrosion performance. By selecting the appropriate combination of materials, coatings and surface modifications, their corrosion resistance can be greatly enhanced. Corrosion prevention of magnesium alloys is a comprehensive guide to the effective prevention of corrosion in these important light metals. Part one discusses alloying, inhibition and prevention strategies for magnesium alloys as well as corrosion and prevention principles. Part two reviews surface treatment and conversion. Beginning with an overview of surface cleaning and pre-conditioning, the book goes on to discuss the use of surface processing and alloying, laser treatments, chemical conversion and electrochemical anodization to improve the corrosion resistance of magnesium alloys. Coatings are then the focus of part three, including varied plating techniques, cold spray coatings, gel and electroless electrophoresis coatings. Finally, the book concludes in part four with a selection of case studies investigating the application of preventative techniques for both automotive and medical applications. With its distinguished editor and international team of expert contributors, Corrosion prevention of magnesium alloys is a key reference tool for all those working with magnesium and its alloys, including scientists, engineers, metallurgists, aerospace and automotive professionals, and academics interested in this field. Chapters provide an overview of surface cleaning and pre-conditioning Examines processes to improve the corrosion resistance of magnesium alloys, including laser treatments and chemical conversion and electrochemical anodization Discusses cold spray, sol-gel and electrophoretic coatings

Author : G L Song
Publisher : Woodhead Publishing
Page : 0 pages
File Size : 32,88 MB
Release : 2011-03-25
Category : Technology & Engineering
ISBN : 9781845697082

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The use of magnesium alloys is increasing in a range of applications, and their popularity is growing wherever lightweight materials are needed. This book provides a comprehensive account of the corrosion of magnesium alloys. It covers not only the corrosion performances and mechanisms of Mg alloys in conventional environments, such as sodium chloride solutions, but also looks at their corrosion behaviours in special media, like engine coolants and simulated body fluids. Part one covers fundamentals such as the corrosion electrochemistry, activity and passivity of magnesium and its alloys. Part two then considers the metallurgical effect in relation to the corrosion of magnesium alloys, including the role of micro-structure and earth-rare elements, the corrosion behaviour of magnesium-based bulk metallic glasses, and the corrosion of innovative magnesium alloys. Part three goes on to describe environmental influences on the corrosion of magnesium alloys, such as atmospheric corrosion, stress corrosion cracking, creep and fatigue behaviour, and galvanic corrosion. Finally, part four is concerned with various means of protecting magnesium alloys against corrosion through the use of aluminium electrodeposition, conversion and electrophoretic coatings, and anodisation. With its distinguished editor and team of contributors, this book is an invaluable resource for metallurgists, engineers and designers working with magnesium and its alloys, as well as professionals in the aerospace and automotive industries.

Author : G.-L. Song
Publisher : Elsevier Inc. Chapters
Page : 42 pages
File Size : 16,40 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089407

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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.

Author : Edward Ghali
Publisher : John Wiley & Sons
Page : 744 pages
File Size : 31,99 MB
Release : 2010-05-05
Category : Science
ISBN : 0470531762

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Valuable information on corrosion fundamentals and applications of aluminum and magnesium Aluminum and magnesium alloys are receiving increased attention due to their light weight, abundance, and resistance to corrosion. In particular, when used in automobile manufacturing, these alloys promise reduced car weights, lower fuel consumption, and resulting environmental benefits. Meeting the need for a single source on this subject, Corrosion Resistance of Aluminum and Magnesium Alloys gives scientists, engineers, and students a one-stop reference for understanding both the corrosion fundamentals and applications relevant to these important light metals. Written by a world leader in the field, the text considers corrosion phenomena for the two metals in a systematic and parallel fashion. The coverage includes: The essentials of corrosion for aqueous, high temperature corrosion, and active-passive behavior of aluminum and magnesium alloys The performance and corrosion forms of aluminum alloys The performance and corrosion forms of magnesium alloys Corrosion prevention methods such as coatings for aluminum and magnesium Electrochemical methods of corrosion investigation and their application to aluminum and magnesium alloys Offering case studies and detailed references, Corrosion Resistance of Aluminum and Magnesium Alloys provides an essential, up-to-date resource for graduate-level study, as well as a working reference for professionals using aluminum, magnesium, and their alloys.

Author : X.-B. Chen
Publisher : Elsevier Inc. Chapters
Page : 34 pages
File Size : 24,19 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089490

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The escalation of ongoing research on the topic of conversion coatings for magnesium alloys confirms that the search continues for appropriate replacements to toxic chromate-based coatings. This chapter reviews the performance of the range of typical conversion coating technologies presently available. As a means to rationalise coating performance and characteristics more generally, thermodynamic analysis has been used to compare coating processes and coating pretreatment, the latter of which appears to be at least as significant as the choice of coating technology itself.

Author : Q. Li
Publisher : Elsevier Inc. Chapters
Page : 24 pages
File Size : 31,19 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089563

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Sol-gel coatings have been widely used to improve corrosion resistance of Mg alloys. This chapter summarizes the history of development of sol-gel coatings, the mechanism and research results of sol-gel coatings improving the corrosion resistance of Mg alloys and some relevant applications. In addition, the prospects of the future development of sol-gel coatings on Mg alloy are presented.

Author : K. Azumi
Publisher : Elsevier Inc. Chapters
Page : 32 pages
File Size : 14,86 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089512

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Plating on Mg alloys has proved difficult due to their high susceptibility to the degradation reactions such as galvanic corrosion in the plating processes. In this chapter, surface conditioning, activation, electroless- or electroplating methods are discussed from viewpoints of corrosion engineering. Degradation reactions of the Mg substrate in each plating stage are considered to figure out how to suppress degradation of substrate and to achieve uniform deposition of a plating layer. Building up an interface between the substrate and the plating layer is also an important subject to establish enough adhesion strength of the plating layer and low defect density to prohibit corrosion progress of the substrate. Al coating plating on Mg alloys electrodeposited from an ionic liquid bath is also introduced to provide coatings with less-galvanic coupling property with a less-noble Mg substrate.

Author : X.-P. Guo
Publisher : Elsevier Inc. Chapters
Page : 36 pages
File Size : 23,53 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089423

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Addition of inhibitors in service environments is a practical corrosion protection approach for engineering materials in industry. This chapter provides an overview of corrosion inhibition of magnesium (Mg) alloys. After a summary of inhibitor inhibition mechanisms on Mg, a few case studies on inhibitor selection and inhibition efficiency evaluation for Mg and its alloys in various media are presented. Based on promising results, future work in this area is proposed.

Author : B.L. Jiang
Publisher : Elsevier Inc. Chapters
Page : 43 pages
File Size : 33,59 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089466

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Micro-arc oxidation (MAO) is a novel and attractive surface engineering process for magnesium (Mg) alloys. In an electrolytic bath with high electric energy, the surface of a magnesium alloy can be converted into a dense and hard ceramic oxide coating. The MAO process can be used in diverse applications as a corrosion control technique. Due to its simplified pre-treatment, superior corrosion resistance performance and environmentally safe coating process, MAO technology has emerged as an important alternative to anodizing techniques in certain areas. This chapter presents a review of MAO techniques for Mg alloys from the scientific, technological and application points of view.

Author : G.-L. Song
Publisher : Elsevier Inc. Chapters
Page : 61 pages
File Size : 48,62 MB
Release : 2013-02-22
Category : Technology & Engineering
ISBN : 0128089482

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Anodization is one of the most important and effective surface pre-treatments for Mg alloys. This chapter systematically summarizes Mg alloy anodizing behavior, the compositions and microstructures of anodized films on Mg alloys and the anodization-influencing factors. Based on the anodizing voltage variation, gas evolution and sparking behavior in a typical anodizing process and the characteristic composition and microstructure of an anodized coating, a four-stage anodizing mechanism is postulated. Moreover, the corrosion performance of anodized Mg alloys is systematically reviewed and a corrosion model is proposed to explain the corrosion performance and electrochemical behavior. It is believed that some of the measured electrochemical features can be utilized to rapidly evaluate or compare the corrosion resistance of anodized Mg alloys.