Rapid In Vitro Corrosion Induced by Crack-Like Pathway in Biodegradable Mg-10% Ca Alloy
- Rapid In Vitro Corrosion Induced by Crack-Like Pathway in Biodegradable Mg-10% Ca Alloy
- 정재영; 권상준; 한형섭; 양귀복; 이지영; 양석조; 조성윤; 차필령; 김영율; 김유찬; 석현광; 안재평
- magnesium alloy; corrosion mechanism; in vitro; TEM; EELS; interdiffusion; crack-like pathway
- Issue Date
- MICROSCOPY AND MICROANALYSIS
- VOL 19, NO S5, 210-214
- 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
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