Abstract
Plasma electrolytic oxidation (PEO) has been extensively applied in the past to improve 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 potentiostatic conditions and the simulation results for the oxide coating thickness over time is 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 (Dehnavi et al., 2014/07/25/ 2014; Arrabal et al., 2009/05/30/ 2009; Rakoch et al., 2006/03/01 2006; Ma et al., 2017/10/10/ 2017; Pyun and Hong, 1992/02/01/ 1992; Caire et al., 2007/02/07 2007) [1-6].
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