Linking the effect of localised pitting corrosion with mechanical integrity of a rare earth magnesium alloy for implant use

Gaalen, Kerstin van; Quinn, Conall; Benn, Felix; McHugh, Peter E.; Kopp, Alexander; Vaughan, Ted J.

doi:10.1016/j.bioactmat.2022.08.004

Cited by 15 publications

(22 citation statements)

References 50 publications

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“…Localized corrosion (pitting) was implemented using a non-local integral formulation, aiming to reduce the influence of mesh size on the results. These problems are intrinsic to models based on continuous damage mechanics [ 4 , 16 ]. The von Mises elastoplastic constitutive model, with isotropic hardening, was used to model the WE43 magnesium alloy mechanical behavior.…”

Section: Methodsmentioning

confidence: 99%

“…Pitting corrosion is a localized form of corrosion, where cavities or “holes” are produced in the material. Pitting is considered more dangerous than uniform corrosion damage since it is more difficult to detect, predict and design [ 4 , 8 , 15 , 16 ]. The localized corrosion mechanisms are generally caused by impurities and inhomogeneities in the material, which are largely unavoidable due to the manufacturing process of such alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The localized corrosion mechanisms are generally caused by impurities and inhomogeneities in the material, which are largely unavoidable due to the manufacturing process of such alloys. While the spatial and temporal evolution of corrosion can be controlled to some degree by varying the alloying composition and/or by applying a surface coating [ 8 , 9 , 10 , 11 , 12 ], it is generally not possible to achieve uniform or non-localized corrosion in magnesium-based biomaterials [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…The localized corrosion mechanism of magnesium in aqueous media is illustrated in Figure 1 . For short immersion periods and for low potential differences, the passive layer covers the surfaces of the material and is able to protect it from corrosion [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, only a limited number of studies provide quantitative results (pit depth, pit density and pitting factor) regarding the severity of localized corrosion for Mg alloys. Few in vivo and in vitro studies have quantified the non-uniform relationship between specimen corrosion and mechanical strength of magnesium alloys undergoing corrosion [ 16 ]. The disproportionate reduction in load-bearing capacity, compared to corresponding mass loss, is clearly attributed to pitting corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Characterization and Numerical Modeling of the Corrosion Effect on the Mechanical Properties of the Biodegradable Magnesium Alloy WE43 for Orthopedic Applications

et al. 2022

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Computational modeling plays an important role in the design of orthopedic implants. In the case of biodegradable magnesium alloys, a modeling approach is required to predict the effects of degradation on the implant’s capacity to provide the desired stabilization of fractured bones. In the present work, a numerical corrosion model is implemented to predict the effects of biodegradation on the structural integrity of temporary trauma implants. A non-local average pitting corrosion model is calibrated based on experimental data collected from in vitro degradation experiments and mechanical testing of magnesium WE43 alloy specimens at different degradation stages. The localized corrosion (pitting) model was implemented by developing a user material subroutine (VUMAT) with the program Abaqus®/Explicit. In order to accurately capture both the linear mechanical reduction in specimen resistance, as well as the non-linear corrosion behavior of magnesium WE43 observed experimentally, the corrosion model was extended by employing a variable corrosion kinetic parameter, which is time-dependent. The corrosion model was applied to a validated case study involving the pull-out test of orthopedic screws and was able to capture the expected loss of screw pull-out force due to corrosion. The proposed numerical model proved to be an efficient tool in the evaluation of the structural integrity of biodegradable magnesium alloys and bone-implant assembly and can be used in future works in the design optimization and pre-validation of orthopedic implants.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Characterization and Numerical Modeling of the Corrosion Effect on the Mechanical Properties of the Biodegradable Magnesium Alloy WE43 for Orthopedic Applications

et al. 2022

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Bioabsorbable Composite Laminates of Poly‐Lactic Acid Reinforced with Surface‐Modified Mg Wires for Orthopedic Implant Applications

Ali,

González,

Kopp

et al. 2024

Adv Eng Mater

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Unidirectional and multidirectional laminates of Mg wire‐reinforced PLA‐matrix composites were manufactured by an improved compression molding strategy that allows excellent control on the position and orientation of the wires. Two different types of Mg wires, with and without surface modification by continuous plasma electrolytic oxidation were used, the former to improve the interfacial strength and to reduce the degradation rate of Mg wires in biological environments. The mechanical properties of the constituents as well as of composites were measured before and after degradation by immersion in simulated body fluids and the corresponding deformation, fracture and degradation mechanisms were analyzed in detail. It was found that the presence of the Mg wires improved the mechanical behavior in tension and compression of unidirectional composites in the longitudinal direction (close to cortical bone) and that quasi‐isotropic laminates with tailored properties could be designed from the data of unidirectional composites.This article is protected by copyright. All rights reserved.

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Endowing biodegradable Zinc implants with dual-function of antibacterial ability and osteogenic activity by micro-addition of Mg and Ag (≤ 0.1 wt.%)

Chen

Zhao

et al. 2023

Acta Biomaterialia

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Linking the effect of localised pitting corrosion with mechanical integrity of a rare earth magnesium alloy for implant use

Cited by 15 publications

References 50 publications

Experimental Characterization and Numerical Modeling of the Corrosion Effect on the Mechanical Properties of the Biodegradable Magnesium Alloy WE43 for Orthopedic Applications

Experimental Characterization and Numerical Modeling of the Corrosion Effect on the Mechanical Properties of the Biodegradable Magnesium Alloy WE43 for Orthopedic Applications

Bioabsorbable Composite Laminates of Poly‐Lactic Acid Reinforced with Surface‐Modified Mg Wires for Orthopedic Implant Applications

Endowing biodegradable Zinc implants with dual-function of antibacterial ability and osteogenic activity by micro-addition of Mg and Ag (≤ 0.1 wt.%)

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