Technical Note: Potential-pH Diagrams for the Fe-Cl⁻-H₂O System at 25 to 150 C Available to Purchase

The thermodynamic properties of metals in aqueous systems are commonly presented as potential-pH (Pourbaix) diagrams in which equilibrium potentials for various reactions are plotted as a function of pH at the temperature of interest.¹  Most of the diagrams that have been compiled have considered metal-water systems at room temperature. Some investigators have calculated high-temperature Pourbaix diagrams for iron in: water,^2,3  aqueous sulfur,^4-6  aqueous chloride,⁷  high-salinity brine,⁸  and high-salinity brine with hydrogen sulfide.⁹  The Fe-Cl⁻-H₂O system was investigated previously at a lower concentration of Cl⁻ of 0.1 M at 25 C.^10,11  The studies at high temperatures were also at lower Cl⁻ concentrations of 0.1 M⁷ and 3.6 M^8,9  compared to the present investigation in saturated NaCI in which the concentration of Cl⁻ is 7 M at 150 C. The aim of this investigation is to...