A mechanistic study of iron passivation and transpassive behavior in sulfate solutions using thermo-kinetic diagrams.

ABSTRACT: Understanding the dissolution and passivation of iron in aqueous environments is essential for enhancing its corrosion resistance and expanding its applications. We present Thermo-Kinetic (TK) diagrams for iron in deaerated solutions with no added sodium sulfate (Na₂SO₄) and with 0.1 M Na₂SO₄ over the pH range 1-14, constructed by integrating current density contours from potentiodynamic polarization with thermodynamic E-pH diagrams. TK diagrams indicate that in solutions with no added Na₂SO₄, iron passivates above pH 7, with a minimum passive current density (i_p) of 5 ×10^-6 mA·cm^-2 at pH 8. The addition of 0.1 M Na₂SO₄ delayed passivation until pH 12 and increased i

SUBMITTER: Khollari MAR 

PROVIDER: S-EPMC12494497 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature