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Rapid In Vitro Corrosion Induced by Crack-Like Pathway in Biodegradable Mg–10% Ca Alloy

Published online by Cambridge University Press:  06 August 2013

Jae-Young Jung ,
Sang-Jun Kwon ,
Hyung-Seop Han ,
Gui Fu Yang ,
Ji-Young Lee ,
Seok-Jo Yang ,
Sung-Youn Cho ,
Pil-Ryung Cha ,
Young-Yul Kim  and
Yu-Chan Kim
...Show all authors
Jae-Young Jung
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Sang-Jun Kwon
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Hyung-Seop Han
Affiliation:
Center for Biomaterials, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Gui Fu Yang
Affiliation:
Center for Biomaterials, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Ji-Young Lee
Affiliation:
Center for Biomaterials, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Seok-Jo Yang
Affiliation:
Department of Mechatronics, College of Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea
Sung-Youn Cho
Affiliation:
R&D Center, U&i Corporation, Uijeongbu, Kyunggi-do 480-761, Republic of Korea
Pil-Ryung Cha
Affiliation:
School of Advanced Materials Engineering, Kookmin University, Seoul 137-702, Republic of Korea
Young-Yul Kim
Affiliation:
Department of Orthopedics, St. Mary's Hospital, The Catholic University of Korea, Daejeon 301-723, Republic of Korea
Yu-Chan Kim
Affiliation:
Department of Mechatronics, College of Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea
Hyun-Kwang Seok
Affiliation:
Department of Mechatronics, College of Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea
Jae-Pyoung Ahn*
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
*
*Corresponding author. E-mail: jpahn@kist.re.kr
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Abstract

The in vitro corrosion mechanism of the biodegradable cast Mg–10% Ca binary alloy in Hanks' solution was evaluated through transmission electron microscopy observations. The corrosion behavior depends strongly on the microstructural peculiarity of Mg2Ca phase surrounding the island-like primary Mg phase and the fast corrosion induced by the interdiffusion of O and Ca via the Mg2Ca phase of lamellar structure. At the corrosion front, we found that a nanosized crack-like pathway was formed along the interface between the Mg2Ca phase and the primary Mg phase. Through the crack-like pathway, O and Ca are atomically exchanged each other and then the corroded Mg2Ca phase was transformed to Mg oxides. The in vitro corrosion by the exchange of Ca and O at the nanosized pathway led to the rapid bulk corrosion in the Mg–Ca alloys.

Keywords

magnesium alloycorrosion mechanismin vitroTEMEELSinterdiffusioncrack-like pathway
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 210 - 214
Copyright
Copyright © Microscopy Society of America 2013 

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