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Formation of calcareous deposits has the beneficial effect of reducing the current requirement of cathodic protection. This study was focused upon the current-reducing capability of the deposits and its relationship with influential parameters of cathodic protection. Four experimental parameters were selected and investigated over a range that reflects typical seawater conditions. The parameters were applied cathodic potential, flow velocity (actually, rotation speed of electrode), pH, and temperature. Deposits were formed in artificial seawater. Influence of each of the four parameters on cathodic current was obtained by using the factorial design technique. Within the range studied, it was found that pH has the largest influence and temperature the least. This was explained based upon the influence of the parameters on deposit formation and electrochemical reactions.
Lee et al. (Thu,) studied this question.