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Corrosion Analysis of Biodegradable Magnesium Implants

Lee, Namheon
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250274373

Abstract Details

2009, MS, University of Cincinnati, Engineering : Mechanical Engineering.
The purpose of this research is to investigate the micro-galvanic corrosion behavior of the pure magnesium in aqueous solutions, especially in DI water and NaCl to better understand how magnesium corrodes in an aqueous environment.A parametric study is performed first to investigate the effects of variations: the Tafel slopes, open circuit potentials (OCP), the exchange current densities and the water resistivity, on the characteristics of magnesium corrosion. Those variations are taken from literatures and experiment result. All variations have a significant influence on the change of the corrosion rate. The parametric study can provide valuable insight and information about important parameters for both modeling and experimental research. DC polarization test has been conducted to verify the level of OCP of the pure magnesium (99.95 wt %). Electrochemical corrosion reactions were studied as a function of the overpotential, hydrogen ion concentration and pH level of the bulk solution. The water dissociation reaction was also considered as a homogeneous reaction in the bulk solution. Modeling shows that the reduction of the hydrogen ion caused the pH level to increase at the cathode region. At the anode region, the dissolution of magnesium increased as the pH level of the solution was decreased. The pH level of the bulk solution has a strong effect on the hydrogen reduction (hydrogen evolution) level at the cathode region. Various geometries were also investigated to model the effect of the level of impurity content within the magnesium matrix since magnesium corrodes predominantly around impurities. Modeling indicates that the magnitude of the dissolution of magnesium was affected by the area ratio between the cathodic region and the anodic region.
Yijun Liu, PhD (Committee Chair)
Mark Schulz, PhD (Committee Member)
Yeoheung Yun, PhD (Committee Member)
85 p.
Engineering
Magnesium; Modeling

Recommended Citations

Citations

  • Lee, N. (2009). Corrosion Analysis of Biodegradable Magnesium Implants [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250274373

    APA Style (7th edition)

  • Lee, Namheon. Corrosion Analysis of Biodegradable Magnesium Implants. 2009. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250274373.

    MLA Style (8th edition)

  • Lee, Namheon. "Corrosion Analysis of Biodegradable Magnesium Implants." Master's thesis, University of Cincinnati, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250274373

    Chicago Manual of Style (17th edition)

ucin1250274373
767
© 2009, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.