Advanced Mg-Mn-Ca sacrificial anode materials for cathodic protection

Kim, J.-G.; Kim, Y.-W.

doi:10.1002/1521-4176(200102)52:2<137::aid-maco137>3.0.co;2-3

Cited by 34 publications

(12 citation statements)

References 4 publications

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“…20a) because the potential of Mg 2 Ca precipitate was more positive than that of the a(Mg) matrix [35]. The anodic dissolution of magnesium occurred (Eq.…”

Section: Biocorrosion and Hydroxyapatite Formationmentioning

confidence: 99%

The development of binary Mg–Ca alloys for use as biodegradable materials within bone

et al. 2008

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“…20a) because the potential of Mg 2 Ca precipitate was more positive than that of the a(Mg) matrix [35]. The anodic dissolution of magnesium occurred (Eq.…”

Section: Biocorrosion and Hydroxyapatite Formationmentioning

confidence: 99%

The development of binary Mg–Ca alloys for use as biodegradable materials within bone

et al. 2008

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“…The chloride ions present in solution disturbed this dissolution-precipitation process and transformed the insoluble Mg(OH) 2 into soluble MgCl 2 by combining with Mg 2+ ions. [25][26][27] Certain areas of the Mg(OH) 2 film immediately dissolved resulting in pit formation, leaving the fresh alloy surface exposed to the solution. The same chemical reactions (Equations (1)-(3)) continued until the alloy was fully exhausted (Figure 6(b)).…”

Section: In Vitro Degradation Studies Ph Change and Hydrogen Evolutionmentioning

confidence: 99%

In vitro and in vivo assessment of biomedical Mg–Ca alloys for bone implant applications

Makkar

Sarkar

Padalhin

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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Background: Magnesium (Mg)-based alloys are considered to be promising materials for implant application due to their excellent biocompatibility, biodegradability, and mechanical properties close to bone. However, low corrosion resistance and fast degradation are limiting their application. Mg-Ca alloys have huge potential owing to a similar density to bone, good corrosion resistance, and as Mg is essential for Ca incorporation into bone. The objective of the present work is to determine the in vitro degradation and in vivo performance of binary Mg-xCa alloy (x = 0.5 or 5.0 wt%) to assess its usability for degradable implant applications. Methods: Microstructural evolutions for Mg-xCa alloys were characterized by optical, SEM, EDX, and XRD. In vitro degradation tests were conducted via immersion test in phosphate buffer saline solution. In vivo performance in terms of interface, biocompatibility, and biodegradability of Mg-xCa alloys was examined by implanting samples into rabbit femoral condyle for 2 and 4 weeks. Results: Microstructural results showed the enhancement in intermetallic Mg 2 Ca phase with increase in Ca content. Immersion tests revealed that the dissolution rate varies linearly, with Ca content exhibiting more hydrogen gas evolution, increased pH, and higher degradation for Mg-5.0Ca alloy. In vivo studies showed good biocompatibility with enhanced bone formation for Mg-0.5Ca after 4 weeks of implantation compared with Mg-5.0Ca alloy. Higher initial corrosion rate with prolonged inflammation and rapid degradation was noticed in Mg-5.0Ca compared with Mg-0.5Ca alloy. Conclusions: The results suggest that Mg-0.5Ca alloy could be used as a temporary biodegradable implant material for clinical applications owing to its controlled in vivo degradation, reduced inflammation, and high bone-formation capability.

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“…However, there is a controversial interpretation for the role of b-Mg 2 Ca in the localized corrosion of Mg-Ca alloy. It had been reported that the potential of b-Mg 2 Ca particles was relatively more positive than that of a-Mg, which caused galvanic corrosion between b-Mg 2 Ca (cathode) and a-Mg (anode) [14,48,49]. However, several investigations recently indicated that Mg 2 Ca phase was highly reactive as an efficient local anode owing to the more negative potential of Mg 2 Ca phase (OCP of Mg 2 Ca is -1.75 V SCE ; OCP of primary Mg phase is -1.65 V SCE in 0.1 mol/L sodium chloride solution) and the chemical and crystal structure of Mg 2 Ca [47,50].…”

Section: Localized Corrosion Of Mg-10ca Alloymentioning

confidence: 99%

Localized Corrosion of Binary Mg–Ca Alloy in 0.9 wt% Sodium Chloride Solution

Hou

Chen

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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To further understand the localized corrosion of magnesium alloy, various in situ electrochemical techniques and ex situ electron microprobe analysis and SEM were used to monitor the corrosion process of Mg-1.0Ca alloy in 0.9 wt% sodium chloride solution. The results indicated that the localized corrosion was accompanied by the formation and thickening of a corrosion product film on the Mg-1.0Ca alloy. A localized corrosion of the alloy initiated selectively on the eutectic micro-constituent zones, then enhanced with the exposure, developed in depth with ring-shaped corrosion products accumulated around and finally formed a volcanic-like pitting. Based on the measurements, an electrochemical corrosion model was proposed accordingly to describe the formation mechanism of the volcanic-like pitting on the alloy in 0.9 wt% sodium chloride solution.

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Advanced Mg-Mn-Ca sacrificial anode materials for cathodic protection

Cited by 34 publications

References 4 publications

The development of binary Mg–Ca alloys for use as biodegradable materials within bone

The development of binary Mg–Ca alloys for use as biodegradable materials within bone

In vitro and in vivo assessment of biomedical Mg–Ca alloys for bone implant applications

Localized Corrosion of Binary Mg–Ca Alloy in 0.9 wt% Sodium Chloride Solution

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