TY - GEN
T1 - Influence of microstructural evolution processed by ECAP on corrosion behavior of pure magnesium in RPMI-1640 medium
AU - Hosaka, Taito
AU - Amanina, Iman
AU - Saruwatari, Naohiro
AU - Yoshihara, Shoichiro
AU - MacDonald, Bryan J.
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Numbers JP16K05974, JP25420010.
Publisher Copyright:
Copyright © 2017 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved.
PY - 2017
Y1 - 2017
N2 - Influence of microstructure changes caused by Equal-channel angular pressing (ECAP) process on corrosion behavior of pure magnesium in RPMI-1640 medium was investigated. The grain size of ECAPed samples (30µm) were greatly reduced compared with the grain size of the annealed sample (200µm). Then, the immersion test has been carried out for a certain period of time. It was revealed that mass loss of the ECAPed sample is larger than the as-received sample and the annealed sample. Thus, it could be considered that many crystal defects yielded by ECAP process reduced the corrosion resistance. However, the corrosion resistance has been improved to a certain extent according to reduction of crystal defects through the heat treatment at the recrystallization temperature or lower. In addition, the amount of gas generation of the ECAP sample after immersion test is larger compared with the as-received sample. Therefore, correlation between the amount of gas generated and the mass loss was confirmed. Based on qualitative identification of the elements by Energy Dispersive X-ray Spectrometry (EDS), the corrosion products of the sample surface after the immersion test has been estimated to be a kind of calcium phosphate. These above results have indicated the potential for fabrication of magnesium as bioabsorbable materials.
AB - Influence of microstructure changes caused by Equal-channel angular pressing (ECAP) process on corrosion behavior of pure magnesium in RPMI-1640 medium was investigated. The grain size of ECAPed samples (30µm) were greatly reduced compared with the grain size of the annealed sample (200µm). Then, the immersion test has been carried out for a certain period of time. It was revealed that mass loss of the ECAPed sample is larger than the as-received sample and the annealed sample. Thus, it could be considered that many crystal defects yielded by ECAP process reduced the corrosion resistance. However, the corrosion resistance has been improved to a certain extent according to reduction of crystal defects through the heat treatment at the recrystallization temperature or lower. In addition, the amount of gas generation of the ECAP sample after immersion test is larger compared with the as-received sample. Therefore, correlation between the amount of gas generated and the mass loss was confirmed. Based on qualitative identification of the elements by Energy Dispersive X-ray Spectrometry (EDS), the corrosion products of the sample surface after the immersion test has been estimated to be a kind of calcium phosphate. These above results have indicated the potential for fabrication of magnesium as bioabsorbable materials.
KW - Biomaterial
KW - Corrosion Behaviour
KW - ECAP Process
KW - Microstructural Evolution
KW - Pure Magnesium
KW - RPMI 1640 Medium
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U2 - 10.5220/0006143201180125
DO - 10.5220/0006143201180125
M3 - Conference contribution
AN - SCOPUS:85052014786
T3 - BIODEVICES 2017 - 10th International Conference on Biomedical Electronics and Devices, Proceedings; Part of 10th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2017
SP - 118
EP - 125
BT - BIODEVICES 2017 - 10th International Conference on Biomedical Electronics and Devices, Proceedings; Part of 10th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2017
A2 - Peixoto, Nathalia
A2 - Fred, Ana
A2 - Gamboa, Hugo
A2 - Vaz, Mario
PB - SciTePress
T2 - 10th International Conference on Biomedical Electronics and Devices, BIODEVICES 2017 - Part of 10th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2017
Y2 - 21 February 2017 through 23 February 2017
ER -