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

Title
Rapid In Vitro Corrosion Induced by Crack-Like Pathway in Biodegradable Mg-10% Ca Alloy
Authors
정재영권상준한형섭양귀복이지영양석조조성윤차필령김영율김유찬석현광안재평
Keywords
magnesium alloy; corrosion mechanism; in vitro; TEM; EELS; interdiffusion; crack-like pathway
Issue Date
2013-08
Publisher
MICROSCOPY AND MICROANALYSIS
Citation
VOL 19, NO S5, 210-214
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.
URI
http://pubs.kist.re.kr/handle/201004/46320
ISSN
14319276
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KIST Publication > Article
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