METHOD FOR PRODUCING A PROTECTIVE COATING FOR A COMPONENT OF A TURBOMACHINE, THE COMPONENT ITSELF AND THE RESPECTIVE MACHINE

1 . A method for obtaining a protective coating on a surface to be treated of a light alloy mechanical component of a turbomachine, the method comprises:

associating a first coating layer resistant to corrosion on said surface to be treated of the mechanical component; and

associating a second coating layer resistant to erosion, abrasion and high temperatures on said first coating layer.

2 . The method of claim 1 , wherein said first coating layer is obtained by means of at least one of the following steps:

providing an anode oxidation on said surface to be treated in such a manner to confer high resistance to corrosion thereon; and

dipping the mechanical component treated with said anode oxidation into a dichromate aqueous solution in such a manner to close any porosities or micro-cracks that might form in said anode oxidation.

3 . The method of claim 2 , wherein said anode oxidation is performed in an electrolytic bath.

4 . The method of claim 2 , wherein said anode oxidation is performed through a galvanic process.

5 . The method of claim 1 , wherein said second coating layer is obtained by applying a resin or paint resistant to erosion, abrasion and high temperatures on said first coating layer.

6 . The method of claim 1 , wherein said second coating layer is obtained by means of a resin or paint of the epoxy-silicone type, obtained by mixing at least one epoxy base and one silicone base, with possible further additives.

7 . The method according to claim 1 , further comprises at least one of the following steps after said anode oxidation and before applying said second coating layer:

dehydrogenating said surfaces previously treated to remove the hydrogen absorbed during said anode oxidation from the substrate and simultaneously improving its adhesion; and

restoring said surface previously treated through the application of a chromatisation for aluminium alloys based on chrome salts.

8 . The method according to claim 1 , further comprises at least one of the following preliminary steps:

treating said surface in such a manner to improve its mechanical surface characteristics and its mechanical resistance;

degreasing said mechanical component with solvents or detergents in vapour phase or by dipping for possible chemical degreasing operations;

shielding possible zones of said surface which should not be coated;

performing an acid activation having a composition suitable for the type of alloy used for manufacturing said mechanical component.

9 . A mechanical component for a turbomachine, the component is made by an aluminium alloy and comprises a protective coating obtained by the method of claim 1 .

10 . A turbomachine comprising at least one mechanical component of claim 9 .