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Anodising (including the Eloxal process, from the electrolytic oxidation of aluminium) is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of aluminium parts. In contrast to galvanised coatings, the protective layer is not applied to the workpiece. Instead , the process changes the microscopic texture and crystal structure of the metal near the surface. A layer measuring between 5 and 25 micrometers is then created, which protects against corrosion - the natural oxide layer of the aluminium is only a few nanometres thick.