Precipitation of sulfate in concentrated solutions may enhance the corrosion risk of stainless steels. The aim of this study is to develop methods and procedures to clarify the risk of stainless steels to localized corrosion in concentrated solutions. In this part of the study the dependence of pitting corrosion susceptibility of stainless steel UNS S30400 (AISI 304, EN 1.4301) on chloride concentration, sulfate concentration and temperature is studied experimentally using potentiodynamic measurements. The special attention is in concentrated solutions which can form due to extensive evaporation and contain also precipitates. A preliminary quantitative model considering the relationships between different variables is described. To calculate water chemistry, thermodynamic equilibrium and precipitation of solids in concentrated solutions, Debye-Hückel/Davies type activity coefficients model is used.

Subject
Anions, Pits, Water, Materials, Precipitation (solids), Evaporation, Chloride ion concentration, Sulfates, Calcium, Chloride solutions, Pitting, Stainless steel, Chlorides
Keywords:
stainless steel, pitting corrosion, localized corrosion, concentrated solutions
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2006
Association for Materials Protection and Performance (AMPP)
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