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Nowadays most aeronautical parts made of aluminium alloys are protected against corrosion by surface anodising and multilayer painting. The treatment is usually carried out with Cr(VI) based compounds. However Cr(VI) substances are affected by REACh regulation and European Commission will set more and more restriction for their use from 2024 onwards. To date, there is not a single Cr(VI)-free protecting treatment for Aluminium 7000 series alloys that matches the results obtained with the Cr(VI) based coatings, so, it is necessary to develop an environmentally and Cr(VI)-free acceptable alternative process.