Improvement of corrosion resistance of pure magnesium in Hanks’ solution by microarc oxidation with sol–gel TiO2 sealing

Shi, Ping; Ng, Wf F.; Wong, M.H.; Cheng, F. T.

doi:10.1016/j.jallcom.2008.01.102

Cited by 200 publications

(64 citation statements)

References 26 publications

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“…Phase structure and oxide layer are among the factors that determine the corrosion rate of an alloy. The Laves structure have been reported to have a thinner oxide layer than the BCC structure [11] and this oxide layer is known for passivation of corrosion [37][38][39]. It is therefore implied that for a dual phase alloy, like the alloys being investigated in this research, the corrosion rate will increase when the proportion of Laves phase with thinner oxide layer increases.…”

Section: Corrosion Behaviormentioning

confidence: 90%

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Abdul¹,

Chown²,

Odusote³

et al. 2017

Preprint

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Abstract:In this work, we investigated the effects of heat treatment on the microstructure, hydrogen storage characteristics and corrosion rate of a Ti34V40Cr24Fe2 alloy. The arc melted alloy was divided into three samples, two of which were separately quartz-sealed under vacuum and heated to 1000 °C for 1 h; one of these samples was quenched and the other furnace cooled to ambient temperature. The crystal structures of the samples were studied via X-ray diffractometry and scanning electron microscopy. Absorption/desorption characteristics were investigated using a Sievert apparatus. Potentiostat corrosion tests on the alloys were performed using an AutoLab ® corrosion test apparatus and electrochemical cell. All samples exhibited a mixture of body-center-cubic (BCC) and Laves phase structures. The corrosion rate, maximum absorption, and useful capacities increased after both heat treatments. The annealed sample had the highest absorption and reversible capacity. The plateau pressure of the as-cast alloy increased after quenching. The corrosion rate increased from 0.0004 mm/y in as-cast sample to 0.0009 mm/y after annealing and 0.0017 mm/y after quenching, due to a decrease in the Cr-content of the C14 phase.

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Section: Corrosion Behaviormentioning

confidence: 90%

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Abdul¹,

Chown²,

Odusote³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…The phase structure and oxide layer are among the factors that determine the corrosion rate of an alloy. The Laves structure has been reported to have a thinner oxide layer than the BCC structure [42], and this oxide layer is known for passivation of corrosion [43][44][45]. It is therefore implied that for a dual phase alloy, such as the alloys being investigated in this research, the corrosion rate will increase when the proportion of the Ti-rich phase with a thinner oxide layer increases.…”

Section: Corrosion Behaviormentioning

confidence: 92%

“…Therefore, an increase in the corrosion rate of heat-treated samples could be a result of a reduction in Cr content in the secondary phase. The stability of the current alloy can be improved with the addition of Ni to promote other secondary phases, such as TiNi [43] and Ti 2 Ni [44]. The synergetic interaction between the main storage phase (BCC) and secondary phases can reduce the equilibrium plateau pressure of the BCC phase and make them available for electrochemical storage purposes [45].…”

Section: Corrosion Behaviormentioning

confidence: 99%

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

et al. 2017

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Abstract:In this work, we investigated the effects of heat treatment on the microstructure, hydrogen storage characteristics and corrosion rate of a Ti 34 V 40 Cr 24 Fe 2 alloy. The arc melted alloy was divided into three samples, two of which were separately quartz-sealed under vacuum and heated to 1000 • C for 1 h; one of these samples was quenched and the other furnace-cooled to ambient temperature. The crystal structures of the samples were studied via X-ray diffractometry and scanning electron microscopy. Hydrogenation/dehydrogenation characteristics were investigated using a Sievert apparatus. Potentiostat corrosion tests on the alloys were performed using an AutoLab ® corrosion test apparatus and electrochemical cell. All samples exhibited a major body-center-cubic (BCC) and some secondary phases. An abundance of Laves phases that were found in the as-cast sample reduced with annealing and disappeared in the quenched sample. Beside suppressing Laves phase, annealing also introduced a Ti-rich phase. The corrosion rate, maximum absorption, and useful capacities increased after both heat treatments. The annealed sample had the highest absorption and reversible capacity. The plateau pressure of the as-cast alloy increased after quenching. The corrosion rate increased from 0.0004 mm/y in the as-cast sample to 0.0009 mm/y after annealing and 0.0017 mm/y after quenching.

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“…P. Shi [11] , first use micro-arc oxidation to prepare porous magnesium ceramic coating layer on magnesium alloy surface, further prepare a layer of TiO 2 by sol-gel method to make micro-arc closed, then coating significantly improved its corrosion resistance in Hank's solution. Y.W.…”

Section: Surface Modificationmentioning

confidence: 99%

Research of Magnesium-based Alloys for Medical Applications

Cheng¹

2014

Proceedings of the 2014 International Conference on Education Technology and Information System (ICETIS 2014)

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Abstract:The biodegradable magnesium and its alloys are a focus of degradable biomaterials research. Their modulus and density approach the human bone's. As implant materials, they can reduce the shielding of implants. They are also lighter than other medical metal. So, they are suitable materials for biodegradable orthopedic implants and vascular stents. But they are difficult to process, corrode rapidly, need a better biocompatibility. This paper reviews the current research status on magnesium and its alloys as biomedical materials. Their main problems and improvements as biomedical materials are introduced. Their directions as biomaterials are also briefly described. Author introduction. IntroductionWith the development and progress of economic and social society, biomedical materials have broad market and good development, in which the implant materials are especially striking. There are mainly three kinds of biological implant materials: metal materials, ceramic materials and polymer materials. Because of the good performance, metal materials have been widely used in many medical fields, especially in the orthopedic field.Medical and implantable metal materials now commonly used are: stainless steel, titanium alloy and cobalt-chromium alloy, etc., and they have great advantages as the implanted material, but the biggest drawback is non-biodegradable, so they needed to be taken out by reoperation after completing its mission. Therefore, the research on biodegradable implant metal materials was born at the right moment. In the 1930s, magnesium alloy has been found biodegradable in the human body. Therefore, magnesium alloys become the study hotspot in the field of medical implant materials. Compared with biodegradable polymer material, magnesium alloys have good mechanical compatibility, and can provide higher initial stability and initial support. The specific strength of pure magnesium is 133GPa/(g/cm3), and the specific strength of magnesium alloy with super strength is 480GPa/(g/cm3), higher than that of Ti6Al4V (260GPa/(g/cm3)) nearly 1 times. Compared with traditional biomedical metal (stainless steel, cobalt chromium alloy, titanium alloy, etc.), modulus of elasticity (45GPa) and density (1.74 g/cm3) is closer to human body skeleton (20GPa, 1.75 g/cm3), after implanted in the body, which can effectively reduce the effect of the stress shielding, and it is lighter relative to other medical metal, suitable for hard tissue implant and tissue engineering scaffold material. Magnesium alloy has good biocompatibility. Magnesium is one of the mineral elements of the human body, and there is nearly 1 mol magnesium in the adult body, then it almost takes part in all the metabolic processes involved in the human body, close to nerve, muscle and heart function, and it is second only to calcium, potassium and sodium body constant elements.Because chemical properties of magnesium are lively, and the standard electrode potential is low, in complex ions environment of the human body, oxide film on the surface of the ...

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Improvement of corrosion resistance of pure magnesium in Hanks’ solution by microarc oxidation with sol–gel TiO2 sealing

Cited by 200 publications

References 26 publications

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

Research of Magnesium-based Alloys for Medical Applications

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