Rapid in vitro corrosion induced by crack-like pathway in biodegradable Mg-10% Ca alloy.
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.
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
Jae-Young
JY
Jung
Sang-Jun
SJ
Kwon
Hyung-Seop
HS
Han
Gui Fu
GF
Yang
Ji-Young
JY
Lee
Seok-Jo
SJ
Yang
Sung-Youn
SY
Cho
Pil-Ryung
PR
Cha
Young-Yul
YY
Kim
Yu-Chan
YC
Kim
Hyun-Kwang
HK
Seok
Jae-Pyoung
JP
Ahn