The Role of Oxalate Ions in the Coverage
of Mild Steel with Polypyrrole*

A. Asan^z, M. Kabasakaloglu, and M. L. Aksu

Gazi University, 06500, Ankara, Turkey

Received May 28, 2003; in final form, April 19, 2004

Abstract—In this study, the coverage conditions of mild steel with polypyrrole (PPy) were investigated. It was
observed that the surface was passive up to 0.6 V, to the oxidation potential of pyrrole in oxalic acid solution.
The PPy coverage was obtained with 0.1 M oxalic acid + 0.2 M pyrrole. A passivity mechanism supported with
current potential curves was proposed. The PPy deposition was also investigated according to pyrrole and oxalic
acid concentrations by successive voltammetric scans.

Key words: oxalate, polypyrrole, mild steel, electropolymerization

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