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Performance Assessment of Electrodeposited Thin Epoxy Films

Published online by Cambridge University Press:  15 February 2011

Agustin Santana Lopez,
Mihai V. Popa,
Paula Drob,
Ecaterina Vasilescu,
Iulia Mirza-Rosca,
Cora Vasilescu and
Silviu I. Drob
Agustin Santana Lopez
Affiliation:
Las Lalmas de Gran Canaria University, Despacho 11, 35017 Tafira, Gran Canaria, Spain
Mihai V. Popa
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania
Paula Drob
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania
Ecaterina Vasilescu
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania
Iulia Mirza-Rosca
Affiliation:
Las Lalmas de Gran Canaria University, Despacho 11, 35017 Tafira, Gran Canaria, Spain
Cora Vasilescu
Affiliation:
Institute of Physical Chemistry, Spl. Independentei 202, 77208 Bucharest, Romania
Silviu I. Drob
Affiliation:
Politehnica University, Str. Polizu 1, 78126, Bucharest, Romania
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Abstract

The paper presents the experimental results concerning the performance assessment of electrodeposited epoxy films using electrochemical techniques (electrochemical impedance spectroscopy–EIS and anodic polarization) assisted by microscopical studies. The films were formed during the cathodic and anodic electrodeposition of a modified epoxy resin on carbon steel substrate. The specimens were tested in a normal aerated 3% NaCl solution at room temperature for a total period up to 1500 hours. Analysis of the impedance spectra has established an equivalent electric circuit with two time constants fitted to describe the electrodeposited epoxy film/carbon steel/electrolyte system. The time monitoring of the principal elements from the equivalent electric circuit were used to determine protective properties of the electrodeposited epoxy films. Results show a high performance of electrodeposited epoxy films, characterized by uniformity, insignificant porosity, very low water and ions permeability.

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