College
College of Engineering and Polymer Science
Date of Last Revision
2023-05-05 06:10:06
Major
Corrosion Engineering
Honors Course
4200:497
Number of Credits
3
Degree Name
Bachelor of Science
Date of Expected Graduation
Spring 2022
Abstract
Electrochemical impedance spectroscopy (EIS) is an important non-destructive tool that allows for a deeper understanding of the electrochemical processes and mechanisms occurring in an electrochemical cell. Equivalent electrical circuits (EECs) are used to model the impedance data into electrical components, such as resistors and capacitors, on a circuit. Current potentiostat offers software packages that can analyze the frequency response, but the software only supports “simple” EEC that can be written as fixed electrical components in some combination of series and parallel. Park and Macdonald propose a transmission line model (TLM) that does not use lumped-element models, instead, the values of the components change relative to the position along the transmission line. This is useful to represent pores that could be formed from passivity breakdown, as seen in steels in chloride-rich environments. Park and Macdonald focused on cylindrical pores, but other pore geometries exist, such as fractal pores. Itagaki et al proposed a three-layer fractal pore system inspired by the TLM by de Levie. The TLM and fractal pore models cannot be solved by the potentiostat software, so a Python tool is proposed to fit the complex EIS. The Python tool can duplicate figures from the model’s respective publications and fittings are successfully performed by evaluating the fitting capabilities of a guess fit to simulated data. However, it is recommended that the user have a good understanding of the material being used as the fittings can still yield inaccurate results.
Research Sponsor
Dr. David M Bastidas
First Reader
Dr. Donald P. Visco Jr.
Second Reader
Dr. Qixin Zhou
Honors Faculty Advisor
Dr. Hongbo Cong
Recommended Citation
Stack, Padraig, "Electrochemical Impedance Spectroscopy Analysis of Corrosion of Reinforcing Steel in Fly Ash Mortar by means of Transmission Line Modeling" (2022). Williams Honors College, Honors Research Projects. 1495.
https://ideaexchange.uakron.edu/honors_research_projects/1495
Final Signature List
Included in
Data Science Commons, Other Chemistry Commons, Other Engineering Commons, Other Materials Science and Engineering Commons