CORROSION STUDY OF A Zn–22Al–2CuALLOY WITH THE SURFACE MODIFIED BY ANY2O3THIN FILM

R. Guerrero-Penalva (), M. H. Farias and L. Cota-Araiza
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R. Guerrero-Penalva: Instituto Tecnológico de Tijuana, Centro de Graduados e Investigación, Apartado Postal 1166, Tijuana, BC 22000, Mexico
M. H. Farias: Centro de Ciencias de la Materia Condensada de la UNAM, Apartado Postal 2681, Ensenada, BC 22800, Mexico
L. Cota-Araiza: Centro de Ciencias de la Materia Condensada de la UNAM, Apartado Postal 2681, Ensenada, BC 22800, Mexico

Surface Review and Letters (SRL), 2002, vol. 09, issue 05n06, 1697-1701

Abstract: Samples of Zn–22Al–2Cu (zinalco) alloys with and without a thin film ofY2O3were submitted to corrosion by potentiodynamic polarization and analyzed by means of Tafel extrapolation. In addition, in-depth profiles by Ar ion sputtering and Auger electron spectroscopy were obtained. Samples withY2O3-deposited film and subjected to potentiodynamic polarization present an improvement in corrosion resistance up to 75% in pH = 4.5 aerated water as compared to samples without theY2O3deposit. The variations in electrochemical parameters are explained by the spectroscopic in-depth profile measurements.

Date: 2002
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DOI: 10.1142/S0218625X02004244

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