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Cathodic dissolution of the passive film on iron—II. Effect of chelating agents

✍ Scribed by Kotaro Ogura; Kazushi Sato

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
469 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

The effect of chelating agent on the cathodic reduction of the passive film on iron has been studied. The results from the potentiodynamic polarisation and galvanostatic reduction curves indicated that the contribution of chelating agent was to expedite the reduction of the passive film, and eventually to pick ferrous ion off metal lattice. This effect was greater in a ligand that forms more stable complex with ferrous ion.

The general mechanism for the cathodic reduction of the passive film in the presence of chelating agent was proposed. The process consisted of several steps, and the rate-determining step was the electrochemical reduction of the ferric complex with chelating agent.

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