The role of individual components of simulated body fluid on the corrosion behavior of commercially pure Mg

Mei, Di; Lamaka, Sviatlana V.; González, Jorge Alfonso Murillo; Feyerabend, Frank; Willumeit‐Römer, Regine; Zheludkevich, Mikhail L.

doi:10.1016/j.corsci.2018.11.011

Cited by 106 publications

(71 citation statements)

References 71 publications

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“…L = ct + d is the linear component, supposed to correspond to the later stages of the reaction. A nearly-identical shape is found in the literature for H2 evolution tests on pure Mg using SBF with a TRIS/HCl buffer [26]. The results for ZX50 are shown in Figure 4c.…”

Section: Evolution Of the Corrosion Reaction With Timesupporting

confidence: 83%

“…The corrosion rates for Mg may differ depending on various parameters: the degree of its purity, heat treatment of the material, the type of electrolyte, the time of immersion, the crystal orientation, etc. [6,7,17,[26][27][28][29][30][31]. As reported, Mg in the high-purity form has the lowest corrosion rate, below 1 mlcm −2 day −1 .…”

Section: Evolution Of the Corrosion Reaction With Timementioning

confidence: 61%

“…However, heat treatment causes its corrosion rate to increase to 1-5 mlcm −2 day −1 [30]. On the other hand, corrosion rates of as-cast pure Mg (melted from 99.98 wt% Mg), under a short time of immersion (i.e., 2 h) may be up to 17 mlcm −2 day −1 [31], and in commercially pure Mg, exposed in SBF for 24 h, they are approximately 6-7 mlcm −2 day −1 [26]. However, due to the fact that the degradation behavior of the Mg alloy is always related to its surrounding environment [31], and the chosen experimental set-up, the evolution of corrosion rates over time is rather complex (Figure 4b).…”

Section: Evolution Of the Corrosion Reaction With Timementioning

confidence: 99%

“…The dimensions of the scales on the other samples are somewhat smaller, but are roughly of the same order of magnitude; thus, it can be tentatively concluded that thicknesses of the degradation layers are 10-100 µm. The surface morphology is typical of Mg alloys exposed to buffered SBF, e.g., [26,27]. SEM imaging of the surface was also attempted but, due to the strong charging of the surface, only two poor-quality SEM images were obtained, with brightness over-saturation on the upper surfaces ( Figure 6).…”

Section: Xps Of Samples After Sbf Immersionmentioning

confidence: 99%

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Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

et al. 2020

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Two binary biodegradable Mg-alloys and one ternary biodegradable Mg-alloy (Mg-0.3Ca, Mg-5Zn and Mg-5Zn-0.3Ca, all in wt%) were investigated. Surface-sensitive X-ray photoelectron spectroscopy analyses (XPS) of the alloy surfaces before and after immersion in simulated body fluid (SBF) were performed. The XPS analysis of the samples before the immersion in SBF revealed that the top layer of the alloy might have a non-homogeneous composition relative to the bulk. Degradation during the SBF immersion testing was monitored by measuring the evolution of H2. It was possible to evaluate the thickness of the sample degradation layers after the SBF immersion based on scanning electron microscopy (SEM) of the tilted sample. The thickness was in the order of 10–100 µm. The typical bio-corrosion products of all of the investigated alloys consisted of Mg, Ca, P and O, which suggests the formation of apatite (calcium phosphate hydroxide), magnesium hydrogen phosphate hydrate and magnesium hydroxide. The bioapplicability of the analyzed alloys with regard to surface composition and degradation kinetics is discussed.

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Section: Evolution Of the Corrosion Reaction With Timesupporting

confidence: 83%

Section: Evolution Of the Corrosion Reaction With Timementioning

confidence: 61%

Section: Evolution Of the Corrosion Reaction With Timementioning

confidence: 99%

Section: Xps Of Samples After Sbf Immersionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

et al. 2020

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“…[69] During immersion of magnesium alloys in DMEM + Glutamax together with 10 pct FBS, their degradation led to the increase of Mg 2+ concentration and pH value in solution, eventually resulting in the formation of degradation products including carbonates and Ca-P salts, etc. [52,70] In the corrosion layers of the investigated alloys, the components of the corrosion products are similar and include these carbonates and Ca-P salts. As the immersion was conducted under cell culture conditions, the presence of CO 2 resulted in the formation of a CO 2 /HCO 3 À buffering system.…”

Section: Corrosion Proceeding Influenced By Intermetallic Microstructurementioning

confidence: 99%

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Zhang

Huang

Feyerabend

et al. 2020

Metall Mater Trans A

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The influence of intermetallic microstructure on the degradation of Mg-5Nd alloy with different heat treatments was investigated via immersion testing in DMEM + 10 pct FBS under cell culture conditions and subsequent microstructural characterizations. It was found that T4 heat-treated sample had the poorest corrosion resistance due to the lack of finely dispersed precipitates inside grains, continuous lamellar particles along grain boundaries and outer Ca-P layer, and to the formation of a loose corrosion product layer. In contrast, the aged samples exhibited a better corrosion resistance due to their presence and to the formation of a compact corrosion layer. Their degradation behavior largely depended on the intermetallic microstructure. Corrosion was initiated in the matrix around stable globular particles Mg41Nd5 at grain boundaries. In the sample aged at high temperature 245 °C, the coexistence of lamellar Mg41Nd5 particles and their nearby Nd-poor regions enhanced the corrosion. The corrosion first started in such regions. It was shown that those finely dispersed precipitates formed during aging had no influence on the corrosion initiation. However, they indeed affected the subsequent corrosion propagation with the immersion proceeding. They supplied barriers for corrosion propagation and hence were beneficial for improving the corrosion resistance. The continuously distributed lamellar Mg41Nd5 precipitates formed at grain boundaries during aging at 245 °C supplied an additional effective obstacle to corrosion propagation. This was especially beneficial for hindering the corrosion propagation at the later stage of corrosion.

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Mg Biodegradation Mechanism Deduced from the Local Surface Environment under Simulated Physiological Conditions

González

Lamaka

Mei

et al. 2021

Adv Healthcare Materials

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Although certified magnesium-based implants are launched some years ago, the not well-defined Mg degradation mechanism under physiological conditions makes it difficult to standardize its use as a degradable biomaterial for a wide range of implant applications. Among other variables influencing the Mg degradation mechanism, monitoring the pH in the corrosive solution and, especially, at the corroding interface is important due to its direct relation with the formation and stability of the degradation products layer. The interface pH (pH at the Mg/solution interface) developed on Mg-2Ag and E11 alloys are studied in situ during immersion under dynamic conditions (1.5 mL min -1 ) in HBSS with and without the physiological amount of Ca 2+ cations (2.5 × 10 -3 m). The results show that the precipitation/dissolution of amorphous phosphate-containing phases, that can be associated with apatitic calcium-phosphates Ca 10-x (PO 4 ) 6-x (HPO 4 or CO 3 ) x (OH or ½ CO 3 ) 2-x with 0 ≤ x ≤ 2 (Ap-CaP), promoted in the presence of Ca 2+ generates an effective local pH buffering system at the surface. Thus, high alkalinization is prevented, and the interface pH is stabilized in the range of 7.6 to 8.5.

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The role of individual components of simulated body fluid on the corrosion behavior of commercially pure Mg

Cited by 106 publications

References 71 publications

Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Mg Biodegradation Mechanism Deduced from the Local Surface Environment under Simulated Physiological Conditions

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