Download or read book Corrosion Protection of Magnesium AZ31 Alloy Sheets by Polymer Coatings written by and published by . This book was released on 2011 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion Protection of Magnesium AZ31 Alloy by Polymer Coatings written by Thiago Ferreira da Conceição and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the corrosion protection provided by coatings of poly (ether imide)(PEI), poly vinilidene fluoride (PVDF) and polyacrylonitrile (PAN) on magnesium AZ31 alloy sheets in described. The coatings were prepared by spin-coating and dip-coating, using different solutions of the polymers, and the parameters related to the performance of these coatings was investigated by techniques as electrochemical impedance spectroscopy, infrared spectroscopy, x-ray photoelectron spectroscopy and scanning electron microscopy. Special attention was given to interfacial interactions between substrate and polymer as well as interfacial reactions between the coating and the corrosion products. The influence of acid pre-treatments on the coating properties was also investigated. It was observed that a good protection is related to acid-base interactions at the interface and that self-healing process might take place by reactions between polymer the magnesium hydroxide.
Download or read book Plasma Electrolytic Oxidation PEO Coatings written by Marta Mohedano and published by MDPI. This book was released on 2021-06-02 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma electrolytic oxidation (PEO), also known as micro-arc oxidation (MAO), functionalizes surfaces, improving the mechanical, thermal, and corrosion performance of metallic substrates, along with other tailored properties (e.g., biocompatibility, catalysis, antibacterial response, self-lubrication, etc.). The extensive field of applications of this technique ranges from structural components, in particular, in the transport sector, to more advanced fields, such as bioengineering. The present Special Issue covers the latest advances in PEO‐coated light alloys for structural (Al, Mg) and biomedical applications (Ti, Mg), with 10 research papers and 1 review from leading research groups around the world.
Download or read book Conversion Coatings for Magnesium and its Alloys written by Viswanathan S. Saji and published by Springer Nature. This book was released on 2022-02-01 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances in Corrosion Control of Magnesium and its Alloys written by Viswanathan S. Saji and published by CRC Press. This book was released on 2023-08-22 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion prevention of magnesium alloys written by G.-L. Song and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion prevention of magnesium alloys written by X.-B. Chen and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion Protection of Magnesium and Magnesium Alloys written by E. L. White and published by . This book was released on 1965 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This memorandum deals with the corrosion protection of magnesium and magnesium alloys. The corrosion resistance of these alloys in many natural environments, while not as good as that of copper, nickel, stainless steel, and aluminum, is in the same range as that of the iron and plain carbon steels. Some type of additional corrosion protection is often necessary and, as with steel, the protective measures usually involve some type of coating system and/or surface treatments. Also, magnesium can suffer accelerated attack when coupled, in the presence of a conductive electrolyte, to most metals below it in the galvanic series. This galvanic effect complicates the problem of corrosion protection. A number of coating systems have been proposed and used satisfactorily. Depending upon the application, these coating systems include the use of conversion coatings, organic coatings, metallic coatings, and others. In addition, special designs can be employed to improve the over-all corrosion resistance of the systems. This memorandum describes many of the coating systems and design methods which are used to reduce corrosive attack on both galvanically coupled and uncoupled magnesium assembliesd (Author).
Download or read book PECVD formed Polymer Coatings for the Corrosion Protection of Biocompatible Magnesium Alloy WE43 written by Zhuoya Deng and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Magnesium (Mg) alloys have gained increasing attention for biomedical applications recently. Current permanently-implanted metallic implants for orthopaedic and cardiovascular applications could cause a range of complications, such as endothelial dysfunction, restenosis and local inflammation, which require subsequent surgical interventions. Magnesium and its alloys may be applied as potential biodegradable materials for such applications due to their good mechanical properties, biocompatibility and degradability. Mg alloy degrades via corrosion reaction in the body and should disappear once it finishes surgical fixation. However, the rapid degradation (corrosion) rate of Mg-based implants in the physiological environment poses challenge of their commercialization and widespread use. Formation of anti-corrosive coating is an effective technique to control the corrosion rate of Mg and its alloy. This research focused on investigating the possibility of using biocompatible plasma polymer coatings fabricated by PECVD under various deposition condition, varying from pressure, deposition time and gas ratio to control degradation rate of a biocompatible Mg alloy WE43. Preliminary measurements confirmed that a PECVD coating produced from 1,3-butadiene and ammonia (PPB:N) offered best anti-corrosive properties, and this coating was subsequently chosen for further optimization and characterization for its anti-corrosive properties. It was found that the anti-corrosive properties of the PPB:N depend on both the deposition time and deposition pressure. The optimum coating-formation conditions were determined to be at 100 Pa and 40 minutes of deposition. The coating produced under these conditions offered a protection efficiency of 99.7% after 20 hours of immersion in PBS. Long-term tests evidenced that the PPB:N coating offered a 92% of protection efficiency even after 10 days of immersion in corrosive PBS. Hence, this coating can be considered as a good candidate for control of corrosion rate of a biomedical grade Mg alloy WE43." --
Download or read book Corrosion Prevention of Magnesium Alloys written by Guang-Ling Song and published by Elsevier. This book was released on 2013-02-22 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Corrosion Behavior of Microarc Oxidation and Polycaprolactone Coatings Applied to AZ31 Magnesium Alloy Evaluated in Simulated Body Fluid and Balanced Salt Solution written by Benjamin M. Wilke and published by . This book was released on 2015 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent research in orthopedic implant materials has focused on the use of magnesium alloys as a base material due to its mechanical properties similar to that of human bone. Rapid corrosion of magnesium materials in aqueous environments poses a significant hurdle to their application as a biomedical implant. A variety of coatings have been shown to improve the corrosion resistance of magnesium based materials in simulated body fluid environments including microarc oxidation and polymer coatings. However, formulation and corrosion rates vary significantly between solution types. Furthermore, in vivo results have shown that many common in vitro solutions over estimate corrosion rates. In addition to variations between solutions needing to be resolved, there has been little work performed to characterize large sample corrosion under stress. This is an essential step in evaluating concept performance at a macro scale, for application as a human implant. The experiments performed and presented in this thesis primarily involve the comparison of conventional simulated body fluid (c-SBF) and Earle's balanced salt solution (EBSS). Samples evaluated in these environments are microarc oxidation (MAO) coated AZ31 magnesium alloy and polycaprolactone dip-coated AZ31. MAO coated samples were created for a range of process settings to observe the effect of processing on corrosion performance. A dependence of MAO coating thickness on process voltage was found which augmented the initial corrosion resistance values observed via electrochemical testing. Both MAO and PCL coatings were found to improve the corrosion resistance of the samples as compared to uncoated AZ31. It was found that all variations (MAO, PCL, and uncoated) showed a reduced corrosion rate in EBSS as compared to c-SBF. This corrosion reduction was apparent through potentiodynamic scanning, electrochemical impedance spectroscopy, and visual inspection. Preliminary mechanical corrosion results, in the form of constant extension testing, showed no dependence of corrosion on stress level. Future work may be aimed towards expanding modes of mechanical testing and further refining simulated body fluids to fit with in vivo test results.
Download or read book Corrosion prevention of magnesium alloys written by Q. Li and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion prevention of magnesium alloys written by V.K. Champagne and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion prevention of magnesium alloys written by G.-L. Song and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Magnesium Coating and Corrosion including Cathodic Protection written by and published by . This book was released on 1952 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion prevention of magnesium alloys written by S.A. Salman and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Corrosion of Magnesium Alloys written by G L Song and published by Woodhead Publishing. This book was released on 2011-03-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
