The anodic oxidation of Fe2+ ions in neutral and alkaline solutions was studied by using a gold or platinum rotating disk electrode in the region of limiting currents. The reaction occurs with the quantitative deposition on the base metal of a ferric oxyhydroxide (γ-FeOOH). The effects introduced by the different experimental variables on the limiting currents are reported. The kinetic contributions of the mass transport and of the subsequent reaction steps are individually examined. It is proposed that the reaction scheme involves the coupling of two diffusion steps occurring in solution within the Levich layer and across the thickness of the deposited oxide. These two reaction steps are kinetically connected by the ion transport of Fe2+ ions across the interfacial potential difference; this latter reaction step is considered to introduce the pH dependence of the overall reaction. © 1983.

Anodic deposition of γ-FeOOH layers on inert metal electrodes / S. Ardizzone, L. Formaro. - In: SURFACE TECHNOLOGY. - ISSN 0376-4583. - 19:2(1983), pp. 119-127.

Anodic deposition of γ-FeOOH layers on inert metal electrodes

S. Ardizzone
Primo
;
L. Formaro
Ultimo
1983

Abstract

The anodic oxidation of Fe2+ ions in neutral and alkaline solutions was studied by using a gold or platinum rotating disk electrode in the region of limiting currents. The reaction occurs with the quantitative deposition on the base metal of a ferric oxyhydroxide (γ-FeOOH). The effects introduced by the different experimental variables on the limiting currents are reported. The kinetic contributions of the mass transport and of the subsequent reaction steps are individually examined. It is proposed that the reaction scheme involves the coupling of two diffusion steps occurring in solution within the Levich layer and across the thickness of the deposited oxide. These two reaction steps are kinetically connected by the ion transport of Fe2+ ions across the interfacial potential difference; this latter reaction step is considered to introduce the pH dependence of the overall reaction. © 1983.
corrosion
Settore CHIM/02 - Chimica Fisica
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/186598
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 6
social impact