The influence of phosphate ions on the polarisation behaviour of iron

✍ Scribed by B. Hakansson; P.-E. Augustsson; N.-G. Vannerberg

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 713 KB
• Volume: 28
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(83)85149-4

✦ Synopsis

The polarisation behaviour of pure iron electrodes in weakly acid, deaerated perchlorate solutions with addition ofphosphate ions has been investigated, using a rotating disc electrode and recording medium-fast potentmdynamic sweeps. Current transients resulting from potential-steps are also reported. The dissolution of slightly etched iron electrodes was shown to proceed t:ia two reaction paths, with inherently different characteristics, one at low and the other at high anodic potentials. At low concentrations of phosphate ions both reactions show a positive reactlon order with respect to phosphate, while at higher concentrations the process at low potentials show a negative value and the other process a valueclose to zero. The influence of phosphate ions on a third anodic reaction path. alternative to the reaction at low potentials, a6 well as on the cathodic reactlon is reported.