Revised Pourbaix diagrams for chromium at 25-300\0\C

Revised Pourbaix diagrams for chromium at 25-300\0\C

The revised Pourbaix diagrams for the corrosion of Cr in aqueous solutions at concentrations of 10\+-6\- and 10\+-8\- molal show that Cr(OH)\+v\2\-v\, Cr(OH)\+v\3\-v\, CrO\+v\2\-v\ and CrO\+v\3\-v\ are not thermodynamically stable at any temperature. Cr\+v\2\-v\O\+v\3\-v\ is the only oxide stable at...

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Veröffentlicht in:Corrosion science 1997-01, Vol.39 (1), p.43-57
Hauptverfasser: Beverskog, B, Puigdomenech, I
Format: Artikel
Sprache:eng
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Zusammenfassung:The revised Pourbaix diagrams for the corrosion of Cr in aqueous solutions at concentrations of 10\+-6\- and 10\+-8\- molal show that Cr(OH)\+v\2\-v\, Cr(OH)\+v\3\-v\, CrO\+v\2\-v\ and CrO\+v\3\-v\ are not thermodynamically stable at any temperature. Cr\+v\2\-v\O\+v\3\-v\ is the only oxide stable at equilibrium in aqueous solutions, with the exception of 10\+-8\- molal and temperatures over 150\0\C where no solid Cr compound is stable. Aqueous complexes and predominance diagrams are also discussed.
ISSN:0010-938X