Microstructure of localized corrosion front on Mg alloys and the relationship with hydrogen evolution

Chu, Peng-Wei; Mire, Etienne Le; Marquis, Emmanuelle A.

doi:10.1016/j.corsci.2017.09.022

Cited by 41 publications

(12 citation statements)

References 61 publications

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“…), where oxygen reduction reaction (ORR) is the main cathodic process. 1,[4][5][6][7][8] A convincing explanation for the predominance of HER is the highly negative corrosion potential exhibited by Mg. 9 HER : 2H 2 O þ 2e À ! H 2 " þ2OH À (1)…”

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confidence: 99%

High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

et al. 2020

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Comprehending the corrosion mechanism of magnesium is of major interest in diverse fields. Typically, hydrogen evolution reaction is considered as the only cathodic reaction during Mg corrosion. However, recent works demonstrate importance of considering oxygen reduction reaction (ORR) as a second cathodic process at specific conditions. With oxygen micro-optode, we show that ORR rate was higher on slower corroding ultra-high-purity Mg (UHP-Mg), while lower on faster corroding commercially pure Mg (CP-Mg), where massive hydroxide layer impeded oxygen permeation. These findings shed light on yet another facet of complex mechanism of Mg corrosion.

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High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

et al. 2020

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“…It also showed that the addition of Sr further improved the mechanical properties of Mg-1Zn-1Sn alloy. We speculate that the reasons for the improved mechanical properties may be due to the second phase strengthening [ 26 , 27 ] or slight texture variations, and the specific mechanism still needs further study.…”

Section: Resultsmentioning

confidence: 99%

In Vitro Studies on Mg-Zn-Sn-Based Alloys Developed as a New Kind of Biodegradable Metal

et al. 2021

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Mg-Zn-Sn-based alloys are widely used in the industrial field because of their low-cost, high-strength and heat-resistant characteristics. However, their application in the biomedical field has been rarely reported. In the present study, biodegradable Mg-1Zn-1Sn and Mg-1Zn-1Sn-0.2Sr alloys were fabricated. Their microstructure, surface characteristics, mechanical properties and bio-corrosion properties were carried out using an optical microscope (OM), X-ray diffraction (XRD), electron microscopy (SEM), mechanical testing, electrochemical and immersion test. The cell viability and morphology were studied by cell counting kit-8 (CCK-8) assay, live/dead cell assay, confocal laser scanning microscopy (CLSM) and SEM. The osteogenic activity was systematically investigated by alkaline phosphatase (ALP) assay, Alizarin Red S (ARS) staining, immunofluorescence staining and quantitative real time-polymerase chain reaction (qRT-PCR). The results showed that a small amount of strontium (Sr) (0.2 wt.%) significantly enhanced the corrosion resistance of the Mg-1Zn-1Sn alloy by grain refinement and decreasing the corrosion current density. Meanwhile, the mechanical properties were also improved via the second phase strengthening. Both Mg-1Zn-1Sn and Mg-1Zn-1Sn-0.2Sr alloys showed excellent biocompatibility, significantly promoted cell proliferation, adhesion and spreading. Particularly, significant increases in ALP activity, ARS staining, type I collagen (COL-I) expression as well as the expressions of three osteogenesis-related genes (runt-related transcription factor 2 (Runx2), osteopontin (OPN), and osteocalcin (Bglap)) were observed for the Mg-1Zn-1Sn-0.2Sr group. In summary, this study demonstrated that Mg-Zn-Sn-based alloy has great application potential in orthopedics and Sr is an ideal alloying element of Mg-Zn-Sn-based alloy, which optimizes its corrosion resistance, mechanical properties and osteoinductive activity.

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“…Further, the charge transfer resistance R ct value is increased and the double layer capacitance value is decreased due to GO + Pr chemisorption on the alloy surface and the uniform surface. [91][92][93] The charge transfer resistance and double layer capacitance values are shown in Table 3. Furthermore, the GO + Pr composite material shows excellent anticorrosion resistance in acidic environments due the Pr nanoparticle diffusing to the basal plane of the GO internal layer; this enhances passivation on the Mg alloy surface and controls H 2 evolution.…”

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confidence: 99%

Praseodymium-decorated graphene oxide as a corrosion inhibitor in acidic media for the magnesium AZ31 alloy

et al. 2018

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Microstructure of localized corrosion front on Mg alloys and the relationship with hydrogen evolution

Cited by 41 publications

References 61 publications

High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

In Vitro Studies on Mg-Zn-Sn-Based Alloys Developed as a New Kind of Biodegradable Metal

Praseodymium-decorated graphene oxide as a corrosion inhibitor in acidic media for the magnesium AZ31 alloy

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