In the present research the corrosion behavior of AISI 316 Stainless Steel was analyzed, as reinforcement in Ternary Concretes made with partial substitutions of the Composite Portland Cement (CPC) by combinations of Sugar Cane Bagasse Ash (SCBA) and Silica Fume (SF) in different percentages, compared to AISI 1018 steel. Four concrete mixtures were made, all with a ratio w / c = 0.65, the percentages of substitution were 0%, 10%, 20% and 30%. The specimens were exposed in seawater as an aggressive medium, corrosion was evaluated by monitoring the corrosion potential E_corr (ASTM C-876-15) and corrosion rate I_corr (ASTM G59). The results of E_corr and I_corr after 150 days of exposure show a better performance of AISI 316 steel, with a 10% of probability corrosion and a negligible level of corrosion respectively, the Ternary Concrete with 20% partial replacement of the CPC by the combination of SCBA-SF presented the best protection against corrosion.