Localized corrosion of type 304 stainless steel in simulated swimming pool water
AdvisorJones, Denny A.
Mining and Metallurgical Engineering
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Type 304 stainless steel (304SS) was investigated in simulated swimming pool water and chlorinated NaCl solutions. The effects of chlorination cyanuric acid and chloride on electrochemical behavior of 304SS was studied with potentiodynamic and cyclic polarization tests measuring corrosion potential, pitting potentials and protection potentials. Chlorination showed strong oxidizing ability which significantly increased corrosion potential of 304SS and increased the susceptibility to pitting and crevice corrosion. Cyanuric acid in chlorinated solution further increased the susceptibility to pitting corrosion but had no effect on crevice corrosion. Chloride increased pitting corrosion, consistent with previous results in the literature but this effect was relatively minimal comparing to the effects of chlorination and cyanuric acid Because of low AFC (available tree chlorine) and chloride contents in test solutions. No pitting corrosion was observed on 304SS during 2 month exposure Corrosion potential of 304SS was decreased by cyanuric acid in general, but was increases by chloride in solutions with presence of both HOCI and cyanuric acid.
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