Download or read book Development of Silane Based Coating for Corrosion Protection of Magnesium Alloy for Biomedical Implant Application written by Swati Gaur and published by . This book was released on 2015 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomaterials are used in several medical applications today, such as fixation devices,replacements and surgical equipment. Implants are typical examples of a biomaterial application and there are several different implant materials used today. Conventional implant materialsinclude stainless steels, cobalt-chromium alloys, alumina, polymers (methyl methacrylate), polyethylene etc. There are several impediments associated with long term presence of implants inside body, including allergy and sensitization. After the healing and curing, the implant isremoved by a second surgery which is not only costly but also very painful. To make this process simpler, less painful and cost effective, there is a need for alternative methodology, called the use of temporary biodegradable implants. The purpose of biodegradable implant is to support tissueregeneration and healing by material degradation and simultaneous implant replacement through the surrounding tissues. In recent years there has been increased amount of focus on magnesium and its alloys for their potential use as biodegradable implant materials. Magnesium isbiocompatible; has excellent mechanical properties; is natural for human body, and seems to stimulate new bone formation. However, a serious problem with magnesium is its high corrosion rate with consistent hydrogen gas formation which delays the healing process. Hence, there is need for controlling their degradation rate, by some surface modification.In this research work magnesium based alloy system containing calcium and zinc wasinvestigated (Mg-6Zn-Ca alloy) which are supposed to be non-toxic in the body. The work focused on to mitigate/delay the corrosion rate of the alloy by development of silane based coating systems for effective corrosion resistance and selecting the coating chemistry to providebiocompatibility. Two different types of silane based coating systems were studied anddeveloped. Phosphonato silane approach (DEPETES with MTEOS and BTESPT as precursor)and non-Phosphonato silanes approach (GPTMS with MTEOS) were used to develop coating.As developed coatings were subjected to various detailed characterization techniques like, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) and the cross-linking in the coating was studied using Fourier transform infrared spectroscopy (FTIR)and performance evaluation, using Electrochemical Impedance Spectroscopy (EIS), Potentiodynamic polarization, hydrogen evolution and pH change. Further, biological responseof human osteoblast cell line on the developed coating system was studied. The in vitro cytotoxicity studies were performed on human osteoblast cells MG-63 to observe cellmorphology, attachment, proliferation and differentiation. It was found that the silane coated alloy shows an improved corrosion resistance and biocompatibility as compared to bare Mg-6Zn-Ca alloy.

Download or read book The Role of Silane Sol Gel Coatings on the Corrosion Protection of Magnesium Alloys written by Yolanda Castro and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium alloys, as the lightest structural metallic material with promising physical, mechanical, and biodegradable properties, have become very attractive for different technical applications, especially for industrial and biomedical fields. However, rapid corrosion is the most critical obstacle that limits its use to play a major role in large-scale applications. The simplest way to control the corrosion rate is to prevent a direct contact of the magnesium substrate with the environment by using surface modification technologies. Silica sol-gel coatings are considered a promising solution to enhance the corrosion resistance of magnesium alloys because sol-gel-based coating systems form very stable chemical bonds with the metallic surface. In this chapter, an insight about the advances in silica sol-gel coatings as an alternative method to control the corrosion of Mg and its alloys will be exposed. A wide overview of the most relevant aspects and their current applications, specifically for aerospace, automobile, and biomedical applications will be described. The modification of silica sol-gel matrix by the incorporation of different types of inhibitors to achieve an active barrier property on Mg alloys has been also considered. Finally, the future perspective based on the development of new silica sol-gel coatings on Mg alloy will be presented.

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 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 Magnesium and Its Alloys as Implant Materials written by Mirco Peron and published by CRC Press. This book was released on 2020-03-18 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite their tremendous potential, Mg and its alloys are not yet used in biomedical applications. This book aims to provide scientific insights into the challenges of the materials, and give an overview of the research regarding their mechanical properties, corrosion behaviour and biological performances. The authors intend to put the reader into the position to accurate discern the proper Mg-based material for his/her applications and to choose the proper improvement strategy to his/her cause. To this aim, the manuscript is structured as follow: in Section 2, the main challenges hampering the use of magnesium in biomedical applications and the common improvement strategies are listed. In Section 3, the most investigated Mg alloys are reported in separate sub-sections, detailing their mechanical properties, corrosion behaviour and biotoxicity. High-pure and ultra-high-pure Mg, Al-based Mg alloys, Zn-based Mg alloys, Ca-based alloys and RE-based Mg alloys have been considered. In Section 4, the alloys’ performances with respect to the challenges is summarized providing the reader with useful information and suggestions on the potentially most suited choice. Finally, in Section 5, an outlook portraying the authors’ opinion of the future development of the field will be provided. This book will allow biomedical engineers, surface scientists, material scientists, implant manufacturers and companies working on implant approval an overview of the state-of-the-art technologies adopted so far to overcome the drawbacks of Mg for biomedical applications. Particular emphasis is put on explaining the link between mechanical, corrosion and biocompatible properties of Mg and its alloys as well as their pros and cons. In doing so, the authors intend to put the reader into the position to accurate discern the proper Mg-based material for his/her applications and to choose the proper improvement strategy to his/her cause.

Download or read book Magnesium Alloys for Biomedical Applications written by Deepak Kumar and published by CRC Press. This book was released on 2024-04-26 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium alloys have enormous potential for use in biomedical implants. Magnesium Alloys for Biomedical Applications delves into recent advances and prospects for implementation and provides scientific insights into current issues posed by Mg alloy materials. It provides an overview of research on their mechanical and tribological characteristics, corrosion tendencies, and biological characteristics, with a particular emphasis on biomedical implants. Details the fundamentals of Mg alloys as well as necessary surface modifications of Mg alloys for biomedical use. Discusses emerging Mg alloys and their composites. Covers mechanical, tribological, and chemical properties, as well as fatigue and corrosion. Highlights emerging manufacturing methods and advancements in new alloy design, composite manufacturing, unique structure design, surface modification, and recyclability. Helps readers identify appropriate Mg-based materials for their applications and select optimal improvement methods. Summarizes current challenges and suggests a roadmap for future research. Aimed at researchers in materials and biomedical engineering, this book explores the many breakthroughs achieved with these materials and where the field should concentrate to ensure the development of safe and reliable Mg alloy-based implants.

Download or read book The Corrosion Protection and Mechanism Studies of Magnesium as Biomateirials Using Anodization and Silane Deposition written by Dingchuan Xue and published by . This book was released on 2012 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium (Mg) and its alloys are emerging as a possible biodegradable implant material. The corrosion behavior of pure Mg, AZ31, and AZ91D were evaluated in various In Vitro and In Vivo environments to investigate their potential application of being biomaterials. Mg implants may degrade too quickly in the body, before the natural healing process is complete. Anodization is known to be an effective approach for slowing down the initial corrosion rate of magnesium (Mg) and its alloys. Anodization was investigated to slow down the initial corrosion of Mg in a simulated body corrosive environment. Pure Mg and AZ91D alloy were anodized and their corrosion resistance was compared in terms of anodization behavior and parameters such as applied voltage and current with different anodization time. Electrochemical impedance spectroscopy, DC polarization, and immersion testing were used to evaluate the corrosion resistance of Mg samples and further optimize anodization parameters. The results showed that anodization increased the corrosion resistance of both pure Mg and AZ91D samples. Further characterization showed the anodized layers on both pure Mg and AZ91D consisted of Mg, O and Si, in the mixture of MgO and Mg2SiO4. The anodization of AZ91D was further investigated by studying the specific use of oxy-salts to improve the corrosion resistance of anodization coatings. Oxy-salts of silicate, phosphate, and carbonate were added separately to a sodium hydroxide alkaline electrolyte used for anodization. This modified process was investigated in terms of anodizing behavior, the surface properties of the film, and enhanced corrosion protection of the metal. Anodization of AZ91D using the silicate containing electrolyte generated sparks and increased the electrolyte temperature, and produced a thicker and more corrosion resistant layer than the other oxy-salts. In this process, MgO and SiO2 formed Mg2SiO4 at high temperature and silicon (Si) in the anodized coating was mainly presented in Mg2SiO4. Phosphorus (P) and carbon (C) were not found in the coatings from the phosphate and carbonate containing electrolyte anodizations. The effects of silicate concentration and anodizing time on the surface properties and corrosion resistance were studied in detail. A detailed chemical structure of the Si-containing anodized coating was postulated. Moreover, this paper described the water-based bis-[triethoxysilyl] ethane (BTSE) silane modification on the surface of Magnesium-Yttrium (Mg-Y) alloy for adhesion promoting, crosslinking of resins, and corrosion protection. Surface characterization of ESEM, FTIR, and EDX showed the hydrolysis and condensation of silane resulted in a strong covalent bonding. In Vivo corrosion behaviors of the uncoated and coated Mg-Y alloy were evaluated in the acute implantation by using novel self-developed corrosion probes which were inserted into the body cavity and subcutaneous tissue of the mice. In Vitro experiments, compared to In Vivo results, artificial simulated body solutions were more corrosive. Based on the electrochemical experiments of potentio-dynamics polarization and electrochemical impedance spectroscopy (EIS), the epoxy-modified BTSE silane coating successfully increased corrosion resistance at the initial stage of implantation.

Download or read book Surface Modification of Magnesium and its Alloys for Biomedical Applications written by T.S.N. Sankara Narayanan and published by Elsevier. This book was released on 2015-01-30 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of biodegradable implants which can remain in the human body to fix a problem and subsequently dissolve, or be absorbed, consumed or excreted, without warranting a secondary surgery, is very appealing to scientists. Due to their excellent biocompatibility and biodegradability, magnesium implants provide a viable option many problems associated with permanent metallic implants such as, restenosis, thrombosis, permanent physical irritation, and inability to adapt to growth and changes in human body. Volume 2 of this important new book explores practical issues of magnesium and magnesium alloys, physical and mechanical modification and coatings to enhance this material for biomedical applications. Includes expert analysis on chemical solution deposition of hydroxyapatite (HAp) and octacalcium (OCP) phosphate coatings for magnesium Comprehensive coverage of biomimetic modifications, surface functionalization of biomolecules, natural, conducting and biodegradable polymeric coatings Lucid dissection of chemical, physical, mechanical and electromechanical modifications of magnesium and its alloys for biomedical applications

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 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 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 prevention of magnesium alloys written by K. Yang and published by Elsevier Inc. Chapters. This book was released on 2013-02-22 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Corrosion and Protection of Magnesium Alloys written by Liang Wu and published by Frontiers Media SA. This book was released on 2023-02-16 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

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 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 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.