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Electrochemical behaviour of iron electrode in acidic acetonitrile solutions

✍ Scribed by O.A.H. Derosa; V.A. Macagno; M.C. Giordano

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
518 KB
Volume
21
Category
Article
ISSN
0013-4686

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✦ Synopsis

km dissolution as well as hydrogen evolution was studied in HCI and HBr acetonitrile solutions in a concentration range between 2.8 x IO-' M and 9.8 x 10m4 M. Halide concentration was changed by adding lithium halide to some of the previous solutions. Measurements were performed at 00Β°C.

Current efficiency for a two-electron transfer was about 100 per cent for both anodic and cathodic reactions.

Corrosion and kinetic parameters were obtained from the polarization curves performed under different experimental conditions. Tafel slopes of 2.3 x 2 RT/F were found for both anodic and cathodic reactions.

A reaction mechanism for the anodic reaction is postulated on the basis of anion adsorption. An inhibitory effect, probably due to solvent adsorption al the electrode, occurs as the acid concentration decreases, affecting both the anodic and cathodic polarization curves.

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