| Summary: | This study compares corrosion activities of carbon steel B450C and SS 430 (Mn in low content) exposed for 30 days in cement extract solution. Iron oxide and hydroxide were formed as corrosion products, in addition to CaCO<sub>3</sub>, in the presence of Cr<sub>2</sub>O<sub>3</sub> on SS 430. Because of the decrease in pH, B450C lost the passive state when OCP shifted to negative values, while SS 430 showed positive OCP values, maintaining its passive state. The SEM images confirmed that the corrosion attack on the surface was less aggressive for SS 430. The Nyquist plots of EIS initially showed capacitive behavior and later changed to semi-linear diffusion impedance, which SS 430 maintained firmly. The phase angle Bode diagrams confirmed these changes. Two equivalent circuits were applied. The calculated values of <i>R<sub>p</sub></i> for SS 430 increased over time (protective passive layer mainly of Cr<sub>2</sub>O<sub>3</sub> oxide), while for carbon steel, <i>R<sub>p</sub></i> reached maximum value after 168 h and then decreased, maintaining minimum values approximately five orders lower than those of the stainless steel.
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