Assembly comprising two metallic parts protected against the formation of a galvanic couple
The invention relates to an assembly ( 1 ) comprising a first metallic part ( 2 ) and a second metallic part ( 4 ) assembled together and made from different materials, the first and second parts being provided with a first contact surface and a second contact surface ( 2 a, 4 a ) respectively in contact with each other, at least one of the contact surfaces being provided with a protective coating ( 12,14 ) capable of preventing the metallic parts from forming a galvanic couple. According to the invention, at least one protective coating comprises a coat of paint ( 12 a, 14 a ) containing a filler of particles conducting electricity. To be applied to the domain of fluid conveyance systems onboard an aircraft.
1 . Assembly ( 1 , 100 ) comprising a first metallic part ( 2 , 102 ) and a second metallic part ( 4 , 104 ) assembled together and made from different materials, the first and second parts ( 2 , 4 , 102 , 104 ) being provided with a first contact surface ( 2 a ) and a second contact surface ( 4 a ) respectively, in contact with each other, at least one of said first and second contact surfaces ( 2 a , 4 a ) being provided with a protective coating ( 12 , 14 ) capable of preventing said first and second metallic parts ( 2 , 4 , 102 , 104 ) from forming a galvanic couple, characterised in that at least one protective coating ( 12 , 14 ) comprises a paint coat ( 12 a , 14 a ) containing a filler of particles conducting electricity.
2 . Assembly ( 1 , 100 ) according to claim 1 , characterised in that each protective coating ( 12 , 14 ) is composed exclusively of one coat of paint ( 12 a , 14 a ) containing a filler of particles conducting electricity.
3 . Assembly ( 1 , 100 ) according to claim 1 or claim 2 , characterised in that the first metallic part ( 2 , 102 ) is made from carbon steel and the second metallic part ( 4 , 104 ) is made from an aluminum alloy, and in that only the first contact surface ( 2 a ) is coated with a protective coating.
4 . Assembly ( 1 , 100 ) according to claim 1 or claim 2 , characterised in that the first metallic part ( 2 , 102 ) is made from stainless steel and the second metallic part ( 4 , 104 ) is made from an aluminum alloy, and in that only the second contact surface ( 4 a ) is coated with a protective coating.
5 . Assembly ( 1 , 100 ) according to any one of the previous claims, characterised in that for each coat of paint ( 12 a , 14 a ) containing a filler of particles conducting electricity, said particles are carbon and/or metal particles.
6 . Assembly ( 100 ) according to any one of the previous claims, characterised in that said first part ( 102 ) is a fluid conveyance tube fitting, and in that said second part ( 104 ) is a fluid conveyance tube.
7 . Assembly ( 1 , 100 ) according to any one of the previous claims, characterised in that it comprises more than two metallic parts in contact.
8 . Aircraft comprising at least one assembly ( 1 , 100 ) according to any one of the previous claims.
9 . Method for manufacturing an assembly ( 1 , 100 ) comprising a first metallic part ( 2 , 102 ) and a second metallic part ( 4 , 104 ) assembled together and made from different materials, the first and second parts ( 2 , 4 , 102 , 104 ) being provided with a first contact surface ( 2 a ) and a second contact surface ( 4 a ) bearing on each other, said method comprising a step to protect said metallic parts ( 2 , 4 , 102 , 104 ) consisting of forming a protective coating ( 12 , 14 ) on at least the first or the second contact surface ( 2 a , 4 a ), each protective coating ( 12 , 14 ) being capable of preventing the first and second metallic parts ( 2 , 4 , 102 , 104 ) from cooperating to form a galvanic couple, characterised in that at least one protective coating ( 12 , 14 ) is formed so as to include a coat of paint ( 12 a , 14 a ) containing a filler of particles conducting electricity.
10 . Use of a paint containing a filler of particles conducting electricity to form a protective coating ( 12 , 14 ) capable of preventing a first metallic part ( 2 , 102 ) and a second metallic part ( 4 , 104 ) from forming a galvanic couple, these parts being in contact and assembled together, and being made from different materials.