Evaluation of the Corrosion of AISI 304 Stainless Steel Embedded in Sustainable Concrete with High Volumes of Scba-SF Exposed in Marine Environment

The present study evaluates corrosion by electrochemical techniques of AISI 304 Stainless Steel and AISI 1018 Steel, embedded in sustainable concrete mixtures made with high volumes of SCBA-SF as a partial substitute for Portland Cement, the substitutions were 0%, 30%, 40% and 50%. The design of the concrete mixtures was made according to ACI 211.1, for a ratio w/ c = 0.65. The specimens to be evaluated were exposed in a marine or aggressive environment (Seawater) and water (Medium Control). The electrochemical techniques used were that of Corrosion Potential, E corr (ASTM C-876-15) and Corrosion Kinetics, I corr (ASTM-G59). According to the results obtained after more than 150 days of monitoring, AISI 1018 Steel presents E corr values that indicate a 90% probability of corrosion and Severe Corrosion, depending on the percentage of substitution of SCBA-SF used. The AISI 304 Stainless Steel presented a significantly higher corrosion resistance than AISI 1018 Steel, reporting values of E corr that indicate a 10% probability of corrosion and magnitudes of I corr indicating a negligible to moderate corrosion level, with a better performance in the mixes with 30% and 50% the substitutions of SCBA-SF.