Method of treatment against corrosion and against wear

Patent metadata

Field	Value
Publication number	US-2016319453-A1
Application number	US-201415105906-A
Country	US
Kind code	A1
Filing date	Dec 17, 2014
Priority date	Dec 18, 2013
Publication date	Nov 3, 2016
Grant date	—

Abstract

Subjecting an aluminum or aluminum alloy substrate to anti-corrosion and anti-wear treatment that is applicable in particular in the field of aviation for protecting certain mechanical parts of airplanes or helicopters that are subjected simultaneously to corrosion and to wear, including applying to the substrate, a sol-gel treatment step forming a sol-gel layer; and after the sol-gel treatment step, a hard oxidation step forming a hard oxide layer.

First claim

1 . A method of subjecting an aluminum or aluminum alloy substrate to treatment against corrosion and against wear, the method comprising applying the following steps to the substrate:
a sol-gel treatment step forming a sol-gel layer; after the sol-gel treatment step, a hard oxidation step forming a hard oxide layer; and prior to the sol-gel treatment step, an additional oxidation step forming an additional oxide layer.

2 . A method according to claim 1 , wherein the hard oxidation step is hard anodic oxidation (HAO).

3 . A method according to claim 1 , wherein the additional oxidation step is sulfuric anodic oxidation (SAO), tartro-sulfuric anodic oxidation, or phosphoric anodic oxidation.

4 . A method according to claim 1 , wherein the sol-gel treatment step takes place on the additional oxide layer without a prior step of filling in this layer, and
wherein, during the sol-gel treatment step, the sol-gel infiltrates into the pores of the additional oxide layer.

5 . A method according to claim 1 , wherein at least a portion of the sol-gel used comprises glycidoxypropyltrimethoxysilane.

6 . A method according to claim 1 , further including a machining step performed between the sol-gel treatment step and the hard oxidation step, during which at least one zone for treatment is machined so as to eliminate at least the sol-gel layer from this zone.

7 . A mechanical part comprising:
an aluminum or aluminum alloy substrate; and an anti-corrosion and anti-wear coating obtained by a method according to claim 6 .

8 . A turbine engine including a mechanical part according to claim 7 .

9 . A landing gear including a mechanical part according to claim 7 .

Assignees

• Turbomeca
• Messier Bugatti Dowty

Inventors

• Gurt Santanach Julien
• Crabos Fabrice
• Esteban Julien

Classifications

• C25D11/08

  containing inorganic acids · CPC title

• C23C18/122

  Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes · CPC title

• C23C18/1295

  with after-treatment of the deposited inorganic material · CPC title

• C25D11/04

  of aluminium or alloys based thereon · CPC title

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title