Iron dissolution and passivation in K2CO3-KHCO3 solutions. Rotating ring disc electrode and XPS studies
| Autor: | Alejandro Jorge Arvia, Élida Beatriz Castro, Jorge Roberto Vilche |
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| Jazyk: | angličtina |
| Rok vydání: | 1991 |
| Předmět: |
Disolución
Passivation Chemistry Anodizing General Chemical Engineering Bicarbonate Metal ions in aqueous solution Inorganic chemistry General Chemistry Química Iones Potassium carbonate chemistry.chemical_compound Electrodos Carbonate Discos Rotatorios General Materials Science Rotating disk electrode Bicarbonatos Soluciones Dissolution Ciencias Exactas Hierro |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | Rotating ring-disc electrode studies on the anodic dissolution and passivation of iron in potassium carbonate/bicarbonate buffers at 25°C show that in the active anodic dissolution potential range Fe(II) soluble species are generated. This reaction is favoured by the presence of bicarbonate ions in solution and it is explained through the formation of an unstable soluble complex containing Fe(II) and HCO3−ions. This suggests that the anodic layer at a certain stage of its formation contains some amount of carbonate species. XPS data of surface layers produced at different anodic potentials confirm the presence of the carbonate species in thick anodic layers grown in the prepassive potential region in still solutions, whereas the opposite result is found for the thin passive layers formed at high positive potentials. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas |
| Databáze: | OpenAIRE |
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