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O: Fachverband Oberflächenphysik

O 30: Surface Chemical Reactions and Heterogeneous Catalysis II

O 30.2: Vortrag

Dienstag, 1. April 2014, 10:45–11:00, PHY C 213

Anodization of aluminum surfaces — •Florian Bertram¹, Jonas Evertsson¹, Fan Zhang², Jinshan Pan², Francesco Carlà³, and Edvin Lundgren¹ — ¹Lund University, Division of Synchrotron Radiation Research, Lund, Sweden — ²KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Stockholm, Sweden — ³ESRF, Grenoble, France

Aluminum and Aluminum alloys are used in a broad range of everyday commercial products. For many of these products an efficient corrosion protection is critical. In oxygen or aqueous environment aluminum forms a passivating surface oxide layer with a typical thickness of 2-4.3 nm. This surface oxide already offers some corrosion protection. By increasing the thickness of the surface oxide it is possible to increase the corrosion resistivity. One way to increase the thickness widely used in today’s industry is anodization.

Here, we present the results of the anodization of an aluminum single crystal and an aluminum alloy studied by in-situ x-ray reflectivity. The reflectivity studies have been complemented by electrochemical impedance spectroscopy. Both single crystal as well as alloy samples show a linear increase of film thickness with increasing anodization voltage. However, the slope is much higher in the single crystal case.