[en] Transparent and colourless silica coatings were deposited on anadosing and non-anodising substrates of aluminium-base alloys (series 6063). Coatings were prepared by sol-gel (dipping method) from a silica alkoxide and a mixture of both silica alkolide and silica alkylalkoxide. Preparations were optimised from viscosity, density, surface tension, and contact angle measurements. Densification was carried out at 60 and 120 degree centigree. Reflectance attenuation of coated samples was analysed by UV-VIS-NIR spectroscopy. The results indicated that -10% of attenuation is reached. Durability and resistance against degradation tests of the metal/coating system were undertaken by immersion into aqueous solutions. Electrochemical impedance measurements and potential corrosion of the metallic substrate for variable times were performed. (Author) 7 refs