• Citer

The region of stability of green rust II in the electrochemical potential-pH equilibrium diagram of iron in sulphate medium

par Detournay, Jacquy ;De Miranda, Luiz Roberto Martins ;Derie, René ;Ghodsi, Mehdi
Référence Corrosion science, 15, 5, page (295-306)
Publication Publié, 1975

Article révisé par les pairs

• Détails
• Contenu

Résumé :

The oxidation of Fe(OH)2, by slow air bubbling, can lead to the formation of oxyhydroxides. In sulphate medium the following succession was observed: Fe(OH)2 → green rust II → FeOOH. Green rust II is unstable in sulphate-free solutions; its composition is 2Fe(OH)3.4Fe(OH)2.FeSO4. × H2O. From the values of electrode potential and pH corresponding to the equilibrium between the solution and the solids, GR II and α-FeOOH, the value of free enthalpy of GR II has been evaluated to - 1,020,400 ± 4,600 calories/mole. The probable area of stability of the GR II in the tension-pH equilibria diagram for iron has been established. © 1975 Pergamon Press Ltd.