Journal
APPLIED SURFACE SCIENCE
Volume 346, Issue -, Pages 57-67Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.03.206
Keywords
Aluminum; Anodizing; PEO; Post-treatment; Corrosion
Categories
Funding
- MICINN (Spain) [MAT2012-38407-C03-02]
- Alexander von Humboldt Foundation, Germany
- Ramon y Cajal Programme (MICINN, Spain) [RYC-2010-06749]
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Voltage-controlled PEO coatings were developed on A356 aluminum alloys (gravity-cast and rheocast) with a pre-anodized layer. The influence of the alloy manufacturing process and the effect of Si-rich phase on the structure and composition of the oxide layers were evaluated using SEM, EDS and XRD. The pre-anodized oxide layer preserves the microstructure of the substrate due to the presence of secondary phases that have a different behavior relative to the matrix during anodizing. PEO coatings consisted of a mixture of alpha-Al2O3, gamma-Al2O3 and mullite. The corrosion behavior and the effectiveness of different sealing techniques based on salts of nickel, cobalt, cerium and phosphonic acid were also studied. Post-treatments improved the hydrophobic properties of the coatings and showed a beneficial effect, significantly increasing the coating impedance and thereby reducing the susceptibility to corrosion. (C) 2015 Elsevier B.V. All rights reserved.
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