METHOD FOR FORMING A PROTECTIVE COATING CONTAINING ALUMINIUM AND ZIRCONIUM ON A METAL PART

摘要

The present invention relates to a method for forming, on the surface of a metal part, a protective coating containing aluminium and zirconium, in which said part is brought into contact with an aluminium alloy cement at a treatment temperature, with an atmosphere containing an active gas that reacts with the cement to form a gaseous aluminium halide, which decomposes on contact with the part, depositing aluminium metal thereon, the active gas containing ZrOCI2 which decomposes on contact with the part, depositing zirconium metal thereon, and being formed by vaporization of ZrOCI2 granules which is solid at room temperature. The method is characterized in that the part, the cement and the ZrOCI2 granules are progressively heated together in a chamber from room temperature up to the treatment temperature, with a temperature hold at 400°C ± 200°C.