Graduation Semester and Year
Fall 2024
Language
English
Document Type
Dissertation
Degree Name
Doctor of Philosophy in Materials Science and Engineering
Department
Materials Science and Engineering
First Advisor
Dr. Meletis Efstathios
Second Advisor
Dr. Cao Ye
Abstract
Plasma electrolytic oxidation (PEO) has been extensively applied in the past to improve the tribological properties of titanium and its alloys allowing their widespread use in industrial applications. However, the complete PEO mechanism of action remains unclear. While there are several mathematical models providing useful insights into the PEO process, they do not fully incorporate the effect of applied potential on the outcomes of PEO. In this work, we develop an experimentally informed computational model by expanding on the dielectric breakdown model. We incorporate experimental data to extract key parameters, exploring the iterative dependency of the oxide thickness and ionic current density to predict the oxide growth at various applied external voltages. The model reproduces the PEO process at different constant voltage conditions and the simulation results for the oxide coating thickness over time are in good agreement with the experimental data, validating the application of Faraday’s law and Pyun and Hong's model in describing the coating growth kinetics for the PEO process.
Keywords
Plasma electrolytic oxidation, Titanium, Curve fitting, Potentiostatic, Oxide growth, Galvanostatic, Constant voltage, Constant current
Disciplines
Metallurgy | Other Materials Science and Engineering | Structural Materials
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Ochiabuto, Kingsley I., "Quantitative modeling of micro discharge and oxide growth in plasma electrolytic oxidation of titanium" (2024). Material Science and Engineering Dissertations. 126.
https://mavmatrix.uta.edu/materialscieng_dissertations/126
Included in
Metallurgy Commons, Other Materials Science and Engineering Commons, Structural Materials Commons
Comments
I want to acknowledge.
Dr. Efstathios "Stathis" I. Meletis
Dr. Ye Cao
Mr. Hunter Pitts
Dr. Yao Ren
National Science Foundation UTA/NU Partnership for Research and Education in Materials (NSF DMR-2122128)
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