Corrosion Behaviour of Stainless Steel Grade 304 IN–1MHCL

The corrosion behaviour of 304 grade stainless steel is studied in presence of HCl solution with concentration of 1M.The experiment is tested by the potentistatic polarization techniques. Due to the presence of chloride ions(Cl^-) 304 grade is very much susceptible to thecorrosion of pitting type. The low corrosion resistance was due to surface passive film with less protective to reveal high anodic dissolution rate.The mechanism of corrosion is as also discussed.The oxidised 304 stainless steel is active on immersion, resulting in a low corrosion potential and a high weight loss. After certain duration the stainless steel either remains active or becomes passive depending on HCl content. At low HCl contents, an ongoing active-to-passive transition results in localised corrosion at pits, grain boundaries and honeycombed recesses. Because of anodic brightening, the 304 stainless steel is always active as HCl is concentrated. There is also some parameters which affects the corrosion of 304 stainless steel in HCl which have been taken under consideration during the test such as: Solution Acidity, Oxidizing Agents, Temperature, Films, Dissolved salts, Fluid velocity, Impurities.