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CHARACTERIZATION OF NANOPOROUS ALUMINUM OXIDE LAYERS OBTAINED BY CONTROLLED ANODIC OXIDATION

V.M. Dumitrascu, L. Benea, E. Danaila

First published: 2017-06-20https://doi.org/10.5593/sgem2017/61/s24.006View metrics

Abstract

The properties of aluminum and its alloy make them to be the first choice as manufacturing materials for different equipments and accessories. The light weight, high strength and improved corrosion resistance recommend aluminum and its alloy to be used specially in transportation and construction industries. The native aluminum oxide film formed after exposure in air presents voids and cracks and the exposure aluminum parts to corrosive environments which lead to the degradation and reducing their lifetime. In order to improve the properties of aluminum and its alloys, different surface treatment methods have been developed. Between treatment methods the most used and inexpensive is considered to be the controlled anodic oxidation process. The aim of present paper is to characterize the corrosion behavior and morphological properties of the nanoporous aluminum oxide layer obtained by controlled anodic oxidation. The ex-situ and in-situ characterization methods were used, such as: scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS), open circuit potential (OCP), linear polarization (RP) and cyclic voltammetry (CV). The results show that the controlled anodic oxidation of aluminum and its alloys increases the thickness of nanoporous aluminum oxide film, which leads to the increasing of the polarization resistance and the decreasing of corrosion rate.

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Publication details

Title
CHARACTERIZATION OF NANOPOROUS ALUMINUM OXIDE LAYERS OBTAINED BY CONTROLLED ANODIC OXIDATION
Authors
V.M. Dumitrascu, L. Benea, E. Danaila
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Nano, Bio and Green - Technologies for a Sustainable Future
Publisher
STEF92 Technology
Year
2017
Pages
43-50
SWS Citekey
Dumitrascu2017244350
ISSN
1314-2704
ISBN
978-619-7408-12-6
Language
en
Publication type
Conference Paper
Keywords
aluminum alloysanodic oxidationsurface treatmentcorrosion resistance
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