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Achieving controllable degradation of a biomedical magnesium alloy by anodizing in molten ammonium bifluoride

Authors
 Heng Bo Jiang  ;  Guosong Wu  ;  Sang-Bae Lee  ;  Kwang-Mahn Kim 
Citation
 SURFACE & COATINGS TECHNOLOGY, Vol.313 : 282-287, 2017 
Journal Title
 SURFACE & COATINGS TECHNOLOGY 
ISSN
 0257-8972 
Issue Date
2017
Keywords
Magnesium ; Fluorination ; Corrosion resistance ; Magnesium fluoride ; Biodegradable ; Plasma electrolytic fluorination
Abstract
Magnesium (Mg) and its alloys as biodegradable metallic materials have attracted fundamental research in the field of orthopedics and cardiovascular materials. However, magnesium implants exhibit poor corrosion resistance, especially in the physiological environment, which limits medical applications. To improve the corrosion resistance of the Mg, anodization was applied to an ultra-high concentration of fluoride electrolyte. Then, surface morphology, coating thickness and composition were determined, and the corrosion behavior of anodized Mg alloys was evaluated. The results of coating by anodization showed that a porosity structure with a pore size of 600–900 nm and thickness of 1–14 μm is generated on the Mg alloy substrate, and this coating component is magnesium fluoride. In electrochemical corrosion tests and immersion corrosion tests, the anodized Mg alloy was tested, and the anodized Mg alloy shows significantly improved corrosion resistance compared with untreated Mg alloy in simulated body fluid (SBF).
Full Text
http://www.sciencedirect.com/science/article/pii/S0257897217301019
DOI
10.1016/j.surfcoat.2017.01.090
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Lee, Sang Bae(이상배)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/154194
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