This paper introduces a novel approach to analyze corrosion effects and to model electrochemical problems with non-linear boundary conditions. The computation of the electrical current distribution along protected structures is based on an automated algorithm involving the polarization curves and an integrated iterative process. The method is first used to solve a well-known benchmark test problem and the results are compared to those obtained using the benchmark analytical expression. Then, an example of a realistic cathodic protection system aimed at mitigating stray currents from a HVDC electrode on a pipeline is described and discussed. It is shown that the proposed iterative approach accurately computes the electrochemical potential process. This approach constitutes the core effort in the development of an accurate non-linear polarization solver.

Subject
Electric current, High voltage direct current, Impressed current cathodic protection, Cathodic protection, Pipe to soil potential, Pipelines, Corrosion reactions, DC interference, Corrosion protection, Polarization, Electrodes, Soil, Electrode potential
Keywords:
Corrosion, Polarization, dc interference, Polarization Resistance, ON-Potential, OFF-Potential, Polarized-Potential, Bulter-Volmer Equations
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2023
Association for Materials Protection and Performance (AMPP)
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