Influence of grain size on mechanical and corrosion properties of magnesium alloy for medical implants

Kutniy, K.V.; Papirov, I. I.; Tikhonovsky, М.А.; Pikalov, A. I.; Sivtzov, S.V.; Pirozhenko, L. A.; Shokurov, V. S.; Shkuropatenko, V.A.

doi:10.1002/mawe.200900434

Cited by 54 publications

(36 citation statements)

References 8 publications

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“…However, some researchers reported that Mg alloys with finer grains show higher corrosion rate (Kutniy et al, 2009;Song et al, 2011). Song et al (2011) reported that the corrosion resistance of the ultra-fine grained AZ91D alloy is lower than that of the as-cast AZ91D alloy.…”

Section: Grain Refinementmentioning

confidence: 99%

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Chen¹,

Dai²,

Zhang³

2015

Corrosion Reviews

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In recent years, magnesium (Mg) alloys have attracted great attention due to superior biocompatibility, biodegradability, and other characteristics important for use in biodegradable implants. However, the development of Mg alloys for clinical application continues to be hindered by high corrosion rates and localized corrosion modes, both of which are detrimental to the mechanical integrity of a load-bearing temporary implant. To overcome these challenges, technologies have been developed to improve the corrosion resistance of Mg alloys, among which surface treatment is the most common way to enhance not only the corrosion resistance, but also the bioactivity of biodegradable Mg alloys. Nevertheless, surface treatments are unable to fundamentally solve the problems of fast corrosion rate and localized corrosion. Therefore, it is of great importance to alter and improve the intrinsic corrosion behavior of Mg alloys for biomedical applications. To show the significance of the intrinsic corrosion resistance of biodegradable Mg alloys and attract much attention on this issue, this article presents a review of the improvements made to enhance intrinsic corrosion resistance of Mg alloys in recent years through the design and preparation of the Mg alloys, including purifying, alloying, grain refinement, and heat treatment techniques. The influence of long-period stacking-ordered structure on corrosion behavior of the biodegradable Mg alloys is also discussed.

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Section: Grain Refinementmentioning

confidence: 99%

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Chen¹,

Dai²,

Zhang³

2015

Corrosion Reviews

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“…8 As highlighted by disparate results from a number of recent studies related of Mg and Mg alloys in various environments, grain size can have a varied effect on corrosion rate. [9][10][11][12][13][14][15][16] A survey of these works provides little consensus as to an all-encompassing effect. However, the most relevant conclusions to this study indicate that the pure Mg (grain-refined through equal channel angular pressing [ECAP]) can alternately decrease 10,13 or increase 15 corrosion rate depending on the sodium chloride (NaCl) concentration-0.1 mol dm -3 NaCl and 3.5% NaCl (~0.6 mol dm -3 ), respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on the Grain Size Dependence of Magnesium Corrosion

Ralston¹,

Williams²,

Birbilis³

2012

Corrosion

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Prior works show that grain size can play a role in the corrosion of a metal; however, such works are nominally executed in a single electrolyte/environment at a single pH. In this work, the anodic and cathodic reaction kinetics of pure Mg specimens with grain sizes ranging from approximately 8 μm to 590 μm were compared as a function of pH in 0.1 mol dm -3 sodium chloride (NaCl) electrolytes using anodic polarization experiments and an in situ scanning vibrating electrode technique (SVET). Anodic polarization experiments showed that grain size is important in determining overall electrochemical response, but the environment dictates the form of the grain size vs. corrosion rate relationship (i.e., pH is the overall controlling factor). Consequently, the role of grain size upon corrosion cannot be fully assessed unless a variation in environment is simultaneously studied. For example, the anodic reaction, which dictates active corrosion, also dictates passivation, so the corrosion rate vs. grain size relationship has been shown to "flip" depending on pH. Further, SVET analysis of unpolarized Mg immersed in 0.1 mol dm -3 NaCl electrolyte at neutral pH showed that breakdown of passivity of cast Mg occurred after ~1 h immersion, giving filiform-like corrosion tracks. The front edges of these corrosion features were revealed as intense local anodes, while the remainder of the dark-corroded Mg surface, left behind as the anodes traversed the surface, became cathodically activated. In contrast, grain-refined Mg samples were significantly less susceptible to localized corrosion, and breakdown was not observed for immersion periods of up to 24 h.

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“…From these observations, it is clear that BG particles in the ZK30‐10%BG composites play an important role in improving the corrosion resistance of the matrix alloy. For the ZK30 alloy, a layer of Mg(OH) 2 forms on sample surface at the initial stage of immersion and it is however, still susceptible to attack from acidic ions in the immersion medium such as Cl− ions 32. The following reaction takes place to undermine the integrity of the Mg(OH) 2 layer: Cl− ions are able to penetrate into the inner part of the material through, for example, grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

In vitro degradation behavior and bioactivity of magnesium‐Bioglass^® composites for orthopedic applications

et al. 2011

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To improve the bioactivity and degradation behavior of biodegradable magnesium, biodegradable metal matrix composites with the ZK30 magnesium alloy as the matrix and bioactive glass (BG, 45S5) as the reinforcement were prepared. The microstructures of the ZK30-BG composites showed homogeneous dispersion of BG particles throughout the matrix. XRD and EDX analyses confirmed the retention of the morphological characteristics and composition of BG particles in the composites. Immersion tests in the minimum essential medium with Earle's balanced salts at 37°C showed that the composites with 5 and 10% BG had lower rates of degradation and hydrogen evolution than the matrix alloy. In addition, the tests confirmed that the composites possessed an enhanced ability to induce calcium and phosphate ion deposition on sample surfaces during degradation, suggesting accelerated surface mineralization that would lead to improved bioactivity when compared with the matrix alloy. In vitro cytotoxicity tests showed that the ionic products of the composites formed during degradation possessed a superior ability to support the survival, proliferation, and osteoblastic differentiation of bone marrow stromal cells to those of the ZK30 alloy. The ZK30-BG composites with enhanced bioactivity and reduced degradation rate could be promising biodegradable materials for orthopedic implants.

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Influence of grain size on mechanical and corrosion properties of magnesium alloy for medical implants

Cited by 54 publications

References 8 publications

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Effect of pH on the Grain Size Dependence of Magnesium Corrosion

In vitro degradation behavior and bioactivity of magnesium‐Bioglass^® composites for orthopedic applications

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Influence of grain size on mechanical and corrosion properties of magnesium alloy for medical implants

Cited by 54 publications

References 8 publications

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Improvement of corrosion resistance of magnesium alloys for biomedical applications

Effect of pH on the Grain Size Dependence of Magnesium Corrosion

In vitro degradation behavior and bioactivity of magnesium‐Bioglass® composites for orthopedic applications

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In vitro degradation behavior and bioactivity of magnesium‐Bioglass^® composites for orthopedic applications