The high-temperature (to 150 C) electrochemical polarization behavior of steel in highly alkaline sulfide solutions containing 2.5 molal (m) NaOH + 0.5 m Na2S is described. Anodic polarization and cyclic voltammetry were used. The behavior has been interpreted with reference to calculated thermodynamic electrode potentials. Potential-pH diagrams for the Fe-S-H2O system for the relevant conditions have been presented to aid in this discussion. No significant changes in polarization behavior were observed between 90 and 150 C.

Subject
Equilibrium potential, Noble potential, Iron sulfides, Alkaline solutions, Acidity, Film formation, Steel, Sulfides, Risk reduction, Polarization, Electrodes, Electrode potential, Oxidation
National Association of Corrosion Engineers
1988
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