Method for decorating horology components

A method for decorating a horology component (1) with a white plating, comprising the following steps:

• preparing the horology component (1) and installing said component in a deposition chamber;
• depositing a metallic adhesion layer (10) over the entire horology component via physical vapour deposition;
• depositing an aluminium diffusion layer (11) over the entire component, under a flow of reagent gas, the rate of the reagent gas being controlled so as to obtain an aluminium layer doped with 0.5 at% to 10 at% of reagent gas, such that the aluminium layer crystallises in the form of a faceted crystal structure, via physical vapour deposition;
• depositing a hard layer (12) on said diffusion layer (11) to increase the resistance of the diffusion layer (11) to scratches and other mechanical damage, while preserving the texture of the diffusion layer;
• depositing a layer of pure metal (13) to increase the reflectivity of the previously deposited layers;
• depositing a transparent layer (14) using the ALD method or another vacuum deposition method to enhance the white appearance through interference effects and to chemically protect the layers deposited in the previous steps;
• and
• alternatively, depositing a transparent protective layer (15) using the ALD method or another vacuum deposition method.