College

College of Engineering and Polymer Science

Date of Last Revision

2022-04-25 09:16:46

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

Stack Honors Project Signature List.pdf (221 kB)
Final Signature List

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