Journal
CORROSION SCIENCE
Volume 170, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108679
Keywords
MnO2 catalyst; Biodegradation; Fe-C biocomposite; Cytocompatibility; Mechanical stability
Funding
- Natural Science Foundation of China [51705540, 51935014, 51905553, 81871494, 81871498]
- Hunan Provincial Natural Science Foundation of China [2018JJ3671, 2019JJ50774, 2019JJ50588]
- JiangXi Provincial Natural Science Foundation of China [20192ACB20005]
- Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme
- Project of Hunan Provincial Science and Technology Plan [2017RS3008]
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MnO2 catalysis of oxygen reduction was proposed to accelerate the degradation of Fe-C biocomposite. As an electron mediator, MnO2 was susceptible to obtaining electrons from anodic Fe by forming MnOOH, which then transferred the electrons to oxygen by reforming MnO2. This accelerated the oxygen reduction, thereby speeding up the anodic Fe dissolution. Consequently, Fe-C-MnO2 biocomposite displayed a high corrosion rate of 0.26 mm.y(-1). Additionally, the biocomposite showed high hardness with wear resistance and stable mechanical properties during degradation. Moreover, it possessed good cytocompatibility due to acceptable ion release. These findings demonstrated the potential bone implant applications of Fe-C-MnO2 biocomposite.
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