The effect of continuous additions of sodium hypochlorite (NaClO) on the localized corrosion resistance of stainless steels (SSs) exposed to natural seawater flowing at 1.5 m/s has been studied in field tests lasting 75 days. Residual chlorine of 0.1 to 0.2 ppm and 1 to 2 ppm in seawater were tested. The continuous presence of residual chlorine in an amount equal to 0.1 to 0.2 ppm in the system was able to control the microorganism settlement on the steel surfaces and to prevent the oxygen reduction depolarization due to aerobic bacteria settlement. Both concentrations of NaClO increased the probability of localized corrosion initiation but were effective in reducing the corrosion rate thereafter. Residual chlorine of 0.1 to 0.2 ppm was able to reduce the corrosion rate by about two orders of magnitude in comparison with that observed in unchlorinated seawater.
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Ventura et al. (1989) studied this question.
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