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Thick and Dense Anodic Oxide Layers Formed on Aluminum in Sulphuric Acid Bath

Journal of Materials Science & Technology 2010年第2期26卷 113-118页

作者： W. Bensalah M. Feki M. Wery H.F. Ayedi urcim Department of Materials EngineeringNational School of Engineering IUT Orsay-Paris XI University Plateau du Moulon urcim Department of Materials Engineering National School of Engineering

Thick and dense oxide layers were obtained on aluminium in sulphuric acid electrolyte. For this purpose, the methodology of experimental design was used. A three-variables Doehlert design （bath temperature, anodic current density, sulphuric acid concentration）, was achieved. In order to maximize the growth rate and the density of the anodic oxide layer, optimum path study was conducted. Under the determined optimal anodizing conditions （5.7℃, 3 ***-2,Csul=140 g.L-1）, the estimated response values were 0.86 μmin-1 and 3.12 ***-2 for growth rate and density, respectively. The morphology of optimum layer was examined by scanning electron microscopy （SEM）. The compactness of the optimum anodic layer can be correlated with its morphology revealed by SEM observations.

关键词： Sulphuric anodization Experimental design Growth rate Density

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Mechanical and Abrasive Wear Properties of Anodic Oxide Layers Formed on Aluminium

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Journal of Materials Science & Technology 2009年第4期25卷 508-512页

作者： W. Bensalah K. Elleuch M. Feki M. Wery H.F. Ayedi Unit'e de Recherche de Chimie Industrielle et Mat'eriaux(urcim) Departement of Materials EngineeringNational School of Engineering IUT Orsay-Paris XI University

Aluminium oxide coatings were formed on aluminium substrates in oxalic acid-sulphuric acid bath. Abrasion tests of the obtained anodic layers were carried out on a pin-on-disc machine in accordance with the ISO/DP 825 specifications. The rickets microhardness, D （HV0.2）, and the abrasion weight loss, Wa （mg） were measured. Influence of oxalic acid concentration （Cox）, bath temperature （T） and anodic current density （J） on D and Wa has been examined, and the sulphuric acid concentration （Csul） was maintained at 100 g.L-1. It was found that high microhardness and abrasive wear resistance of oxide layers were produced under low temperatures and high current densities with the addition of oxalic acid. The morphology and the composition of the anodic oxide layer were examined by scanning electron microscopy （SEM）, atomic force microscopy （AFM）, optical microscopy and glow-discharge optical emission spectroscopy （GDOES）. It was found that the chemistry of the anodizing electrolyte, temperature, and current density are the controlling factors of the mechanical properties of the anodic oxide layer.

关键词： Aluminium oxide Vickers microhardness Abrasive wear

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Chemical dissolution resistance of anodic oxide layers formed on aluminum

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Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1673-1679页

作者： W.BENSALAH M.FEKI M.WERY H.F.AYEDI Unité de recherche de Chimie Industrielle et Matériaux (urcim) ENIS.B.P.W.SfaxTunisie IUT Mesures Physiques d'Orsay-Université Paris XI Plateau du Moulon91400 ORSAYFrance

Chemically resistant anodic oxide layers were formed on pure aluminum substrates in oxalic acid-sulphuric acid *** dissolution tests of the obtained anodic layers were achieved in accordance with the ASTM B 680-80 specifications：35mL/L 85% H3PO4＋20g/L CrO3 at 38℃.Influence of oxalic acid concentration,bath temperature and anodic current density on dissolution rate and coating ratio was examined,when the sulphuric acid concentration was maintained at 160g/*** was found that chemically resistant and compact oxide layers were produced under low operational temperature （5℃） and high current densities （3A/dm^2）.A beneficial effect was observed concerning the addition of oxalic acid （18g/L）.The morphology and the composition of the anodic oxide layer were examined by scanning electron microscopy （SEM）,atomic force microscopy （AFM） and glow-discharge optical emission spectroscopy （GDOES）.

关键词： aluminum anodic oxide layer oxalic acid-sulphuric anodization dissolution rate coating ratio

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