Corrosion Activity of Carbon Steel B450C and Low Chromium Ferritic Stainless Steel 430 in Chloride-Containing Cement Extract Solution

The carbon steel B450C and low chromium SS 430 ferritic samples were exposed for 30 days to chloride-containing (5 g L?1 NaCL) cement extract solution. initial pH ? 13.88 decreased 9.6, associated mainly with the consumption of OH? ions formation ?-FeOOH, ?-FeOOH, Fe3O4 Cr(OH)3, as suggested by XRD XPS analysis, in presence CaCO3 NaCl crystals. deep corrosion damages on observed around particles Cu S local cathodes, while first pitting events surface appeared after exposure. change activity each type was provided potentiodynamic polarization curves (PDP). Two equivalent electrical circuits (EC) proposed quantitative analysis EIS (Nyquist Bode diagrams). calculated resistance (Rp), an indicator stability passive films, revealed that presented relatively constant values, being two-three orders magnitude higher than those B450C. thickness (d) layers ?0.5 nm and, contrast, tends disappear days.