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Influence of the surface activation and local pitting susceptibility on the AC-electrograining of aluminium alloys |
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| Authors: | B. Bello Rodriguez J.M.C. Mol B. Kernig J. Hasenclever H. Terryn |
| Affiliation: | aVrije Universiteit Brussel, Department Materials and Chemistry, Research Group Electrochemical and Surface Engineering, Pleinlaan 2, 1050 Brussels, Belgium;bDelft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628 CD Delft, The Netherlands;cHydro Aluminium GmbH, Georg-von-Boeselager-Strasse 21, D-53117 Bonn, Germany |
| Abstract: | AC electrograining of aluminium is strongly influenced by the surface microstructure. The mechanical and electrochemical properties of the sub-surface present in aluminium alloys affect the electrochemical reactions that prevail during electrograining. Etching pre-treatment of aluminium removes intermetallics and rolled-in oxides; as a result, the attack on the aluminium substrate starts with the initial cycles of the electrograining process. Local electrochemical investigations show differences in corrosion and passivation properties between rolled-in oxides and clean surfaces. The interface between rolled oxides and aluminium matrix acts as a weak point for pit initiation. |
| Keywords: | A. Aluminium A. Intermetallics B. SEM B. Potentiostatic C. Pitting corrosion |
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