Abstract
A dynamic mathematical modeling study of reaction‐transport processes taking place in the vicinity of a defect in coating of underground pipeline protected by cathodic protection is presented. The main chemical reactions providing buffering ability of the soil system (water autoprotolysis, carbon dioxide/bicarbonate/carbonate system, dissociation/precipitation of calcium carbonate) are considered. The model calculations provided qualitative and quantitative information on the dynamic variation of the soil solution pH after application of cathodic protection. A significant pH increase (>12), due solely to oxygen reduction, is proved. A moderate polarization (around Kuhn’s postulated protective potential) is, therefore, sufficient for effective protection of underground structures.
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