In-vitro degradation behaviour of WE54 magnesium alloy in simulated body fluid

Walter, R.; Kannan, M. Bobby

doi:10.1016/j.matlet.2010.11.051

Cited by 89 publications

(40 citation statements)

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“…The high frequency capacitive loop corresponds to charge transfer resistance and double layer capacitance, and the mid-frequency capacitive loop is indicative of the relaxation of mass transport through the layer formed due to degradation [34]. The EC model used in this study has been used for both bare and surface engineered magnesium [35][36][37], where R s represents the solution resistance, R ct and C dl are the charge transfer resistance and double layer capacitance, respectively, and R f and C f represent the film effects [36]. The polarisation resistances (R p ), which were calculated by adding R f and R ct [38], are shown in Figure 2b.…”

Section: Resultsmentioning

confidence: 99%

Ion Implantation of Calcium and Zinc in Magnesium for Biodegradable Implant Applications

Somasundaram

Ionescu

Kannan

2018

Metals

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Abstract:In this study, magnesium was implanted with calcium-ion and zinc-ion at fluences of 10 15 , 10 16 , and 10 17 ion·cm −2 , and its in vitro degradation behaviour was evaluated using electrochemical techniques in simulated body fluid (SBF). Rutherford backscattering spectrometry (RBS) revealed that the implanted ions formed layers within the passive magnesium-oxide/hydroxide layers. Electrochemical impedance spectroscopy (EIS) results demonstrated that calcium-ion implantation at a fluence of 10 15 ions·cm −2 increased the polarisation resistance by 24%, but higher fluences showed no appreciable improvement. In the case of zinc-ion implantation, increase in the fluence decreased the polarisation resistance. A fluence of 10 17 ion·cm −2 decreased the polarisation resistance by 65%, and fluences of 10 15 and 10 16 showed only marginal effect. Similarly, potentiodynamic polarisation results also suggested that low fluence of calcium-ion decreased the degradation rate by 38% and high fluence of zinc-ion increased the degradation rate by 61%. All the post-polarized ion-implanted samples and the bare metal revealed phosphate and carbonate formation. However, the improved degradative behaviour in calcium-ion implanted samples can be due to a relatively better passivation, whereas the reduction in degradation resistance in zinc-ion implanted samples can be attributed to the micro-galvanic effect.

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Section: Resultsmentioning

confidence: 99%

Ion Implantation of Calcium and Zinc in Magnesium for Biodegradable Implant Applications

Somasundaram

Ionescu

Kannan

2018

Metals

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“…A wide range of rare-earth containing magnesium alloys, e.g. ZE41, WE43, WE54 and LAE442 (containing rare-earth mixtures such as cerium, lanthanum, ytterbium, neodymium and praseodymium) have also been studied [6][7][8] . In recent years, magnesium-calcium alloys have gained high interest due to their excellent biocompatibility 9,10) .…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Secondary Phase Particles in Magnesium Alloys: A Critical Review

Kannan¹

2016

Corrosion Science and Technology

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Magnesium alloys have been extensively studied in recent years for potential biodegradable implant applications. A great deal of work has been done on the evaluation of the corrosion behaviour of magnesium alloys under in vitro and in vivo conditions. However, magnesium alloys, in general, contain secondary phase particles distributed in the matrix and/or along the grain boundaries. Owing to their difference in chemistry in comparison with magnesium matrix, these particles may exhibit different corrosion behaviour. It is essential to understand the corrosion behaviour of secondary phase particles in magnesium alloys in physiological conditions for implant applications. This paper critically reviews the biodegradation behaviour of secondary phase particles in magnesium alloys.

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“…In the last five years, a number of magnesium alloys have been tested under in-vitro conditions to understand their degradation behaviour and mechanisms [10][11][12][13][14]. AZ (aluminium, zinc) series magnesium alloys are the most highly researched material due to their commercial availability [11,13].…”

mentioning

confidence: 99%

“…Magnesium-calcium alloys and rare-earths containing magnesium alloys e.g. ZE41, WE43, WE54 and LAE442 (containing rare-earth mixtures such as cerium, lanthanum, ytterbium, neodymium and praseodymium) have also been tested [12,14,15]. However, the enhancement in the degradation resistance of magnesium due to alloying has not been encouraging.…”

mentioning

confidence: 99%

“…Due to the high electronegative potential of magnesium (-2.4 V with respect to hydrogen electrode) and its poor passivating tendency, alloying alone may not provide the required protection. Moreover, the inhomogeneous microstructures in these alloys can cause localized degradation [12,16]. It is critical to minimize the localized degradation of magnesium-based biodegradable biomaterials, at least during the intial stage of service, for better mechanical integrity.…”

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confidence: 99%

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