Produção Nacional
Revisado por pares
Electrochemical behaviour of iron in neutral solutions of acetate and benzoate anions
1999; Elsevier BV; Volume: 41; Issue: 11 Linguagem: Inglês
10.1016/s0010-938x(99)00033-5
ISSN1879-0496
AutoresDenise Schermann Azambuja, Luis Roberto Brudna Holzle, Ivan Müller, Clarisse Maria Sartori Piatnicki,
Tópico(s)Hydrogen embrittlement and corrosion behaviors in metals
ResumoThe electrochemical behaviour of iron in pH 6 aqueous solutions of benzoate and acetate anions mixed in varying concentrations and constant ionic strength was investigated. For that purpose cyclic voltammetric experiments were carried out at a disc electrode either static and/or rotating. A high surface coverage is observed in the presence of benzoate anions, thus favouring the establishment of a passive state. The overall process is discussed in terms of a three-dimensional film, the growth mechanism of which is under diffusion and migration control. It was also observed that the addition of chloride ions to the mixed electrolyte solutions containing increasing benzoate concentration shifts the breakdown potential and the repassivation potential toward more positive values.
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