Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses

Nowosielski, R.; Cesarz-Andraczke, Katarzyna; Sakiewicz, P.; Maciej, Artur; Jakóbik‐Kolon, Agata; Babilas, R.

doi:10.1515/amm-2016-0136

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…Magnesium alloys are frequently used in biomedical applications because of their specific properties [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. However, further improvement is still necessary.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Biomedical MgCa4.5 and MgCa4.5Gd0.5 Alloys by Micro-Arc Oxidation

et al. 2021

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The aim of this work was to characterize the structure and corrosion properties of the MgCa4.5(Gd0.5) alloys surface treated by the micro-arc oxidation (MAO) process. The MgCa4.5 and MgCa4.5Gd0.5 alloy samples were processed by MAO in an electrolyte composed of NaOH (10 g/dm3), NaF (10 g/dm3), NaH2PO4 (5 g/dm3), Na2SiO2·5H2O (10 g/dm3) and water. Two different voltages (120 V and 140 V) were used in the MAO process. The alloys protected by an oxide layer formed in the MAO were then the subject of corrosion resistance tests in an environment simulating the human body (Ringer’s solution). After the experiments, the resulting samples were investigated with using SEM, XPS and EDS techniques. The addition of Gd affected the fragmentation of the coating structure, thereby increasing the specific surface; higher voltages during the MAO process increased the number and size of surface pores. Corrosion tests showed that the MgCa4.5Gd0.5 alloys were characterized by low polarization resistances and high corrosion current densities. The studies indicated the disadvantageous influence of gadolinium on the corrosion resistance of MgCa4.5 alloys. The immersion tests confirmed lower corrosion resistance of MgCa4.5Gd0.5 alloys compared to the referenced MgCa4.5 ones. The MgCa4.5 alloy with the MAO coating established at voltage 140 V demonstrated the best anticorrosion properties.

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Section: Introductionmentioning

confidence: 99%

Surface Modification of Biomedical MgCa4.5 and MgCa4.5Gd0.5 Alloys by Micro-Arc Oxidation

et al. 2021

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“…The increasing number of grain boundaries increases the number of crystal lattice defects. Studies described in [35] have shown that amorphous materials based on the Mg-Zn-Ca alloy dissolve more slowly than the same polycrystalline materials. Therefore it can be assumed that further ECAE process would lead to an even greater slowdown of the degradation process.…”

Section: The Dissolution Of Mg Alloysmentioning

confidence: 99%

Archives of Metallurgy and Materials

Boczkal¹,

Karaś²,

Korczak³

et al. 2019

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The effect of plastic deformation process on the dissolution rate of biocompatible Mg alloys was investigated. Two biocompatible MgLi1Ca0,2Zn1 and MgLi1Ca1Zn1 alloys were selected for the study. The alloys were deformed on a 100T press at a temperature of 350°C by conventional extrusion and by the equal channel angular extrusion process (ECAE). The grain size analysis showed a high degree of the grain refinement from approximately 110 mm in the initial state to 2.8 mm after the 3 rd pass of the ECAE process. Compared to as-cast state, the degree of strengthening has increased after plastic forming. The results of biodegradation tests have shown a significant increase in corrosion rate after both conventional extrusion and ECAE, although after subsequent ECAE passes, this rate was observed to slightly decrease in the MgLi1Ca1Zn1 alloy. Based on the results of macro-and microstructure examinations, the corrosion progress in samples after the extrusion process was described.

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