Effect of Mucin and Bicarbonate Ion on Corrosion Behavior of AZ31 Magnesium Alloy for Airway Stents

Materials

Yongseok Jang³  Daniel Owuor³  Jenora T. Waterman¹  Leon White³  Boyce Collins³  Jagannathan Sankar³  Thomas W. Gilbert² 

[1] Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 E. Market St, Greensboro, NC 27411, USA; E-Mail:;ACell Inc., 6640 Eli Whitney Drive, Suite 200, Columbia, MD 21046, USA; E-Mail:;Engineering Research Center for Revolutionizing Metallic Biomaterials (ERC-RMB), North Carolina Agricultural and Technical State University, 1601 E. Market St, IRC RM 119, Greensboro, NC 27411, USA; E-Mails:

关键词: biodegradable metal;    magnesium;    corrosion;    tracheal stent;    Gamble’s solution;    mucin;    bicarbonate ion;   

DOI  :  10.3390/ma7085866

来源: mdpi

【 摘 要 】

The biodegradable ability of magnesium alloys is an attractive feature for tracheal stents since they can be absorbed by the body through gradual degradation after healing of the airway structure, which can reduce the risk of inflammation caused by long-term implantation and prevent the repetitive surgery for removal of existing stent. In this study, the effects of bicarbonate ion (HCO₃⁻) and mucin in Gamble’s solution on the corrosion behavior of AZ31 magnesium alloy were investigated, using immersion and electrochemical tests to systematically identify the biodegradation kinetics of magnesium alloy under in vitro environment, mimicking the epithelial mucus surfaces in a trachea for development of biodegradable airway stents. Analysis of corrosion products after immersion test was performed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). Electrochemical impedance spectroscopy (EIS) was used to identify the effects of bicarbonate ions and mucin on the corrosion behavior of AZ31 magnesium alloys with the temporal change of corrosion resistance. The results show that the increase of the bicarbonate ions in Gamble’s solution accelerates the dissolution of AZ31 magnesium alloy, while the addition of mucin retards the corrosion. The experimental data in this work is intended to be used as foundational knowledge to predict the corrosion behavior of AZ31 magnesium alloy in the airway environment while providing degradation information for future in vivo studies.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.