Active and passive behavior of sintered iron in ammoniacal ammonium carbonate solution

H. S. Kim, Y. T. Kho, K. Osseo-asare, H. W. Pickering

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The anodic dissolution behavior of sintered iron in ammoniacal ammonium carbonate solution (pH = 9.7) has been investigated with the aid of electrochemical techniques. Surface films formed on bulk iron during air exposure or immersion in the ammoniacal solution were characterized by using X-ray photoelectron spectroscopy (XPS). Immersion in the ammoniacal solution gave an apparent open circuit potential (OCP) in the range of E = 0.04 to 0.09 V, standard hydrogen electrode (SHE); at these potentials, no dissolution of Fe was detected. Potential transients obtained during cathodic reactivation and the XPS results suggest that an air-formed oxide of Fe3O4 is responsible for this behavior. The anodic polarization behavior of sintered Fe was similar to that of bulk Fe, showing active, passive, and oxygen evolution regions. A very high current density observed in the passive region for some sintered specimens was attributable to active dissolution within the pore structure, analogous to conditions during crevice corrosion. The presence of oxygen in the solution stabilized both the passive film and the more noble apparent OCP.

Original languageEnglish (US)
Pages (from-to)323-332
Number of pages10
JournalMetallurgical Transactions B
Volume22
Issue number3
DOIs
StatePublished - Jun 1 1991

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Carbonates
carbonates
Iron
iron
dissolving
Dissolution
submerging
X ray photoelectron spectroscopy
photoelectron spectroscopy
Oxygen
Anodic polarization
Networks (circuits)
air
oxygen
Pore structure
Air
Oxides
high current
Hydrogen
Reactive Oxygen Species

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Kim, H. S. ; Kho, Y. T. ; Osseo-asare, K. ; Pickering, H. W. / Active and passive behavior of sintered iron in ammoniacal ammonium carbonate solution. In: Metallurgical Transactions B. 1991 ; Vol. 22, No. 3. pp. 323-332.
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Active and passive behavior of sintered iron in ammoniacal ammonium carbonate solution. / Kim, H. S.; Kho, Y. T.; Osseo-asare, K.; Pickering, H. W.

In: Metallurgical Transactions B, Vol. 22, No. 3, 01.06.1991, p. 323-332.

Research output: Contribution to journalArticle

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