Electrosynthesis of homogeneous and adherent polypyrrole coating on iron and steel electrodes by using a new electrochemical procedure

• Type: Article in International Scientific Journal
• Date: 2002

Authors

José Inácio Martins (Author) FEUP; M. Bazzaoui (Author) Other; T. C. Reis (Author) Other; E. A. Bazzaoui (Author) Other; L. Martins (Author) Other

Journal

Title: Synthetic Metals

Vol. 129 No. 3

Pages: 221-228

ISSN: 0379-6779

Publisher: Elsevier

Indexing

ISI Web of Knowledge

ISI Web of Science

Scopus

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

DOI: 10.1016/S0379-6779(02)00057-7

Abstract (EN): A single-step electropolymerization of pyrrole (Py) on iron and steel surfaces has been performed in aqueous medium in the presence of malate (C4H4O52−) as supporting electrolyte. The malate counter-ion slows down the iron dissolution by leading to the formation of a passivation layer on the working electrode surface, and the Py electropolymerization starts on. The polypyrrole (PPy) films electrosynthesized under different electrochemical techniques are uniform and adherent. The polymer coatings performed galvanostatically have a cauliflower-like structure and are thicker than those obtained by potentiodynamic mode. The adherence of PPy layers to the iron electrodes was estimated at 100% according to the standard sellotape test. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) analysis showed that the obtained coatings have the same structure and morphological properties as those electrodeposited on Pt electrodes.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8