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A numerical method considering both corrosion kinetics and ion transport is proposed to investigate the distribution of current and chloride ions in a cathodic protection system. The impact of impressed current density, concrete resistivity, chloride ion concentration, rebar arrangement, anode arrangement and thickness of protective layer on the current and ion distribution is discussed. Results show that the rebars located closest to anode exhibit the largest current and lowest chloride ion concentration. The utilization of multiple external anodes proves to be an effective means to enhance the cathodic protection's effect, but it impairs the ability of removing chloride ions.
Gong et al. (Mon,) studied this question.
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