Journal
MICROSCOPY AND MICROANALYSIS
Volume 19, Issue -, Pages 210-214Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927613012683
Keywords
magnesium alloy; corrosion mechanism; in vitro; TEM; EELS; interdiffusion; crack-like pathway
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Funding
- Korea Institute of Science and Technology project [2E21950]
- Pioneer Research Center Program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [2011-0001704]
- Seoul R&BD program, Seoul Development Institute, Republic of Korea [SS100008]
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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.
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