Corrosion-resistant abradable covering

1. An abradable covering for adhesively bonding to a wear portion of a structural part, the covering comprising:

at least a polyester-based matrix and an aluminum alloy filler that are molded together,

wherein the molding is performed by sintering or hot injection into a mold,

wherein the abradable covering contains 25% to 55% polyester, a remainder of the abradable covering composition being constituted by an aluminum alloy having 11% to 13% silicon, and

wherein the matrix is constituted by an aromatic polyester of liquid crystal polymer type.

2. A covering according to claim 1 , wherein the aluminum alloy is of 4000 or 5000 series.

3. A structural part including at least one wear portion having an abradable covering according to claim 1 .

4. A part according to claim 3 , the part being made of a metal material or of a composite material.

5. A part according to claim 3 , the part corresponding to a compressor ring of an aeroengine, the compressor ring including a wear portion on an inside surface thereof.

6. A turboprop comprising at least one structural part according to claim 3 .

7. An aircraft comprising at least one turboprop according to claim 6 .

8. A covering according to claim 1 , wherein the aluminum alloy is free of copper.

9. A method of making an abradable covering on a structural part having a wear portion, the method comprising:

molding a composition comprising at least a polyester powder and an aluminum alloy filler to form the abradable covering; and

adhesively bonding the abradable covering on the wear portion of the structural part,

wherein the molding is performed by sintering or hot injection into a mold,

wherein the abradable covering contains 25% to 55% polyester, a remainder of the abradable covering composition being constituted by an aluminum alloy having 11% to 13% silicon, and

wherein the matrix is constituted by an aromatic polyester of liquid crystal polymer type.

10. A method according to claim 9 , wherein the molding is performed at a temperature in a range of 180° C. to 400° C.

11. A method according to claim 9 , wherein the aluminum alloy is of 4000 or 5000 series.

12. A method according to claim 9 , wherein the abradable covering is made as a plurality of abradable covering sectors that are adhesively bonded adjacent to one another on the wear portion of the structural part to form the abradable covering.

13. A method according to claim 9 , wherein the abradable covering is adhesively bonded on the wear portion of the structural part at a temperature that is less than or equal to 180° C.

14. A method according to claim 9 , wherein the abradable covering is cooled prior to being adhesively bonded on the wear portion of the structural part.

15. A method according to claim 9 , wherein the aluminum alloy is free of copper.