On the Characteristics and Corrosion Resistance of Anodic Alumina Films Prepared in Sulfuric Electrolyte with Different Additives

Abstract:

The characteristics including surface morphology, phase constitution, thickness and the corrosion resistance of the porously anodic films prepared in the sulfuric electrolyte with different additives at 35°C were investigated by SEM, EDS, XRD and electrochemical polarization method in this paper. The additives are organic acids, polyhydric alcohols and rare earth (REE) salts. A porous anodic film with about 20 nm holes in diameter can be obtained by additives into the sulfuric electrolyte. The main chemical compositions of the anodic films are Al, O elements, and a small amount of S. The film after boiling water sealing is composed of boehmite (Al₂O₃·H₂O) and alumina (Al₂O₃) phases. The compactness and the thickness of the anodic films can be improved by the coupling effect of the additives, which increases the corrosion resistance of the film. The effect of additives on morphologies and corrosion resistance is discussed.

• Periodical: Applied Mechanics and Materials (Volume 697)
• Pages: 85-89
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.697.85
• Online since: November 2014
• Authors: Xian Fang Yang, Yi Li Wang, Tian Quan Liang*, Cui Hua Zhao
• Keywords: Additive, Anodic Film, Characteristics, Corrosion Resistance, Electrochemical Polarization Method

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