Abstract
The electrochemical resistance in surface layers can be improved without affecting the bulk material through the use of excimer laser treatment. It will be shown via detailed electrochemical measurements that for the surface area treatment of some aluminium alloys, the pitting and exfoliation corrosion resistances in aqueous NaCl-solutions can be improved. The increase in corrosion resistance comes as a result of the homogenization and microstructure refinement, which is due to the surface layer melting, as well as through the decreased electrical conductivity of the resultant passive layer. Morphological investigations of the pits illustrate further changes, an important point being that the resultant pits are not as deep in the excimer laser modified layers compared to those as found in conventional aluminium. As a contact-free and environmentfriendly surface treatment, this UV-irradiation method is suitable for localized improvements of the corrosion resistance, on one hand for the protection of inaccessible components, and on the other hand, for the treatment of corrodible joints (e.g. welded seams).
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