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Corrosion Prevention Of Magnesium Alloys

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Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : G.S. Cole
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089571
Language : En, Es, Fr & De

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Book Description :

This chapter discusses magnesium corrosion with particular reference to how magnesium automotive components, exposed to the automotive corrosion environment, can be protected and provide durable function. The chapter introduces the four types of corrosion that occur with automotive magnesium alloy components. The major focus is on the galvanic events associated with manufacturing and fastening between magnesium components and the steel/aluminum structures used in automotive construction. Examples of new applications, taken from the literature, are discussed with details of the protective modalities that were developed to ensure long-term vehicle durability.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : X.-P. Guo,G.-L. Song,J.-Y. Hu,D.-B. Huang
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089423
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : X.-B. Chen,M.A. Easton,N. Birbilis,H.-Y. Yang,T.B. Abbott
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089490
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : G.-L. Song,Z. Shi
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089482
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : K. Azumi,H.H. Elsentriecy,J. Tang
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089512
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : B.L. Jiang,Y.F. Ge
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089466
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : G.-L. Song
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089555
Language : En, Es, Fr & De

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Book Description :

A thin E-coating can be rapidly deposited on the surface of a Mg alloy in a cathodic E-coating bath without applying any current or potential. The selectively self-deposited coating results from the high surface alkalinity of Mg. The ‘electroless’ E-coating pre-film can offer adequate corrosion protection for Mg alloys. The stability of the film can be further improved significantly after curing. The coating can be either a temporary or permanent layer. It may also be used to pre-treat a Mg alloy surface for a normal E-coating or powder coating. Such a simple dipping step can even seal porous phosphating or anodizing coatings on Mg alloys.

Corrosion of Magnesium Alloys

Corrosion of Magnesium Alloys Book
Author : G L Song
Publisher : Elsevier
Release : 2011-03-25
ISBN : 0857091417
Language : En, Es, Fr & De

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Book Description :

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. Provides a comprehensive account of the corrosion of magnesium alloys covering fundamentals such as the corrosion electrochemistry, activity and passivity Reviews the metallurgical effect in relation to the corrosion of magnesium alloys, including the role of micro-structure and earth-rare elements Assesses environmental influences such as atmospheric corrosion, stress corrosion cracking, creep and fatigue behaviour, and galvanic corrosion

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : G.-L. Song,Z. Xu
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 012808944X
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : G.-L. Song
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089407
Language : En, Es, Fr & De

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Book Description :

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 prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : S.A. Salman,M. Okido
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089474
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : J. Meng,W. Sun,Z. Tian,X. Qiu,D. Zhang
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089415
Language : En, Es, Fr & De

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Book Description :

In magnesium alloys, the rare-earth (RE) elements first react with the impurities in the alloy, then with alloying elements, and finally form an intermetallic compound with magnesium. Therefore, RE elements play the key role in removing impurity and purifying the matrix in Mg alloys so as to enhance the corrosion resistance. The RE elements have a lower electrode potential resulting in a decrease in the electrode potential of the intermetallic compound in which they participate. The reaction results lead to reduced electrode potential difference between the matrix and second phase. It will play an important role in reducing galvanic corrosion.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : D. Höche,A. Nowak,T. John-Schillings
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089431
Language : En, Es, Fr & De

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Book Description :

This chapter discusses the initial stages involved in the handling of magnesium surfaces and looks at the important issues surrounding the preparation of magnesium alloy surfaces for further treatment, including optimized conditions for finishing processes. It begins with a review of mechanical cleaning procedures such as grinding, chemical cleaning, acid pickling and activation. Later sections go on to explain the method of action of various cleaners and their relationship to common post-processing treatments. The chapter ends with a discussion of current trends in the pre-conditioning of magnesium surfaces in the context of magnesium-based engineering and a brief summary.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : W.-T. Tsai,I.-W. Sun
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089539
Language : En, Es, Fr & De

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Book Description :

To improve the corrosion resistance of magnesium (Mg) alloys, surface modification is applied in an attempt to produce a corrosion resistant barrier. In this chapter, a new method to deposit aluminum (Al) film on a Mg alloy surface is demonstrated. Electrodeposition of Al on AZ91D Mg alloy, using an acidic aluminum chloride–1-ethyl-3-methyl-imidazolium chloride ionic liquid (AlCl3–EMIC), has been shown to be feasible. The existence of Al coating can cause a substantial increase in corrosion resistance, reducing the susceptibility of Mg alloy to aqueous corrosion. The results of electrochemical impedance spectroscopy show that Al coating leads to an increase in the polarization resistance of a bare Mg alloy by one order of magnitude in 3.5wt% NaCl solution. Furthermore, the potentiodynamic polarization results show that Al-coated Mg alloy can be passivated, and a wider passive region with a lower passive current density can be obtained if the Al is electrodeposited at a lower applied current or a low cathodic overpotential. The passivity of the co-deposited Al/Zn film is slightly inferior to that of the pure Al coating.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : J. Dutta Majumdar,I. Manna
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089458
Language : En, Es, Fr & De

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Book Description :

Magnesium and its alloys are promising materials for automotive, aerospace and bio-implant applications due to low density (1.81g/cm3), very low elastic modulus (45GPa) and high tensile yield strength (200MPa). However, they corrode too quickly in aggressive environments and possess poor wear resistance. Wear and corrosion are essentially surface dependent degradation which may be improved by suitable modification of surface microstructure and composition. Laser as a source of coherent and monochromatic radiation may be applied for tailoring the surface microstructure and composition. In the present contribution, a detailed overview of laser surface engineering of magnesium-based alloys is presented. Finally, the future scope of application of laser surface engineering of magnesium-based alloys is presented with examples.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : Q. Li
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089563
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : K. Yang,L. Tan
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 012808958X
Language : En, Es, Fr & De

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Book Description :

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.

Corrosion prevention of magnesium alloys

Corrosion prevention of magnesium alloys Book
Author : V.K. Champagne,B. Gabriel,J. Villafuerte
Publisher : Elsevier Inc. Chapters
Release : 2013-02-22
ISBN : 0128089547
Language : En, Es, Fr & De

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Book Description :

Magnesium alloys are widely used in aircraft and automotive components because of their inherent light weight compared to other engineering metals. However, premature corrosion is one of the challenges associated with magnesium. In the aerospace industry, many expensive castings cannot be reclaimed adequately because current methods are often inappropriate due to excessive porosity, oxidation and thermal damage. Cold spray is a solid-state coating process that uses a supersonic gas jet to accelerate small particles against a substrate to produce metal bonding by rapid plastic deformation of the impacting particles. Significantly, magnesium components can be repaired, restored and protected by cold spray deposition of pure aluminum which has thus already been specified by some aerospace users as a standard technique for magnesium repair. In this chapter, the state of the art of commercial cold spray technologies for magnesium repair will be discussed, as well as their advantages and limitations compared to traditional thermal processes.

Corrosion Prevention of Magnesium Alloys

Corrosion Prevention of Magnesium Alloys Book
Author : Guang-Ling Song
Publisher : Woodhead Publishing
Release : 2017-11-13
ISBN : 9780081015971
Language : En, Es, Fr & De

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Book Description :

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

Corrosion Resistance of Aluminum and Magnesium Alloys

Corrosion Resistance of Aluminum and Magnesium Alloys Book
Author : Edward Ghali
Publisher : John Wiley & Sons
Release : 2010-05-05
ISBN : 0470531762
Language : En, Es, Fr & De

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Book Description :

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.