METHOD FOR COATING A PIPE AND PIPE

Abstract

A method for coating a pipe, in particular a motor vehicle pipe, wherein a metallic inner tube is used, and wherein the outer surface of the metallic inner tube is provided with at least one metal layer. A bonding layer is thereupon applied to the metal layer. The pipe is then provided with at least one outer layer. The bonding layer is applied via plasma coating.

Claims

1. A method for coating a motor vehicle pipe, wherein a metallic inner tube is provided, wherein the outer surface of the metallic inner tube is provided with at least one metal layer, wherein at least one bonding layer is thereupon applied to the metal layer, wherein the pipe is thereupon provided with at least one outer layer, and wherein the at least the bonding layer is applied via plasma coating.

2. The method according to claim 1, wherein the metal layer contains at least one metal from the group “aluminum, zinc, aluminum alloy, zinc alloy”.

3. The method according to claim 1, wherein the metal layer is applied to the inner tube via hot-dip coating.

4. The method according to claim 1, wherein the metal layer is applied to the inner tube with a layer thickness of 50 to 200 μm.

5. The method according to claim 1, wherein the bonding layer is applied with a layer thickness of 10 nm to 10 μm.

6. The method according to claim 1, wherein the plasma coating is performed with the bonding agent at a normal pressure or at atmospheric pressure.

7. The method according to claim 1, wherein the plasma coating is performed as a physical vapor deposition and/or chemical vapor deposition process.

8. The method according to claim 1, wherein a plasma coating device is used for plasma coating, and that the material for the bonding layer is fed to the plasma coating device in powder form.

9. The method according to claim 1, wherein the material for the bonding layer is converted into the gas phase in the plasma coating device, and then deposited onto the pipe in solid form.

10. The method according to claim 1, wherein a layer of at least one polymer is used as the outer layer.

11. The method according to claim 1, wherein a chrome-free intermediate layer is interspersed between the metal layer and the bonding layer.

12. The method according to claim 11, wherein the chrome-free intermediate layer has at least one phosphatizing agent.

13. The method according to claim 1, wherein the chrome-free intermediate layer is applied with a thickness of 0.2 to 1 μm.

14. The method according to claim 1, wherein the outer layer is applied with a layer thickness of 0.2 to 3 mm.

15. A motor vehicle pipe configured for fuels and/or hydraulic fluids, coated according to claim 1, wherein the pipe has a metallic inner tube, wherein a metal layer is provided on the metallic inner tube, and wherein a bonding layer is present on the metal layer, wherein the pipe additionally has an outer layer, and wherein the bonding layer is applied as a plasma coating.

16. The method according to claim 1, wherein the motor vehicle pipe is configured for fuels and/or hydraulic fluids.

17. The method according to claim 1, wherein the bonding layer is applied with a layer thickness of 10 to 700 nm.

18. The method according to claim 10, wherein the at least one polymer is at least one polyamide and/or at least one polyolefin.

19. The method according to claim 12, wherein the chrome-free intermediate layer consists of or essentially consists of at least one phosphatizing agent.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure will be described in greater detail below based on a drawing, which only shows an exemplary embodiment. Shown schematically on:

[0017] FIG. 1 is a perspective view of a pipe coated based on the method according to the disclosure,

[0018] FIG. 2 is a magnified cutout A from FIG. 1, and

[0019] FIG. 3 is a schematic view of a preferred embodiment of a plasma coating device suitable for the method according to the disclosure.

DETAILED DESCRIPTION

[0020] The figures show a pipe 1, which was coated based on the method according to the disclosure. In the exemplary embodiment, a motor vehicle pipe can preferably be involved, which is preferably used for fuels and/or hydraulic fluids. The pipe 1 has a metallic inner tube 2, which in the exemplary embodiment is preferably designed as a steel tube. This metallic inner tube 2 is provided with a metal layer 3, which in the exemplary embodiment is preferably designed as an aluminum layer. The aluminum layer can have been applied to the metallic inner tube 2 in a hot-dip method. In particular, a metal layer 3 made of Galfan can be applied to the metallic inner tube 2 instead of an aluminum layer.

[0021] In a preferred embodiment and in the exemplary embodiment, a chrome-free intermediate layer 4 is applied to the metal layer 3 or the aluminum layer, and in one embodiment can have a phosphatizing agent.—The layer thickness of the metal layer 3 can measure 50 to 150 μm in the exemplary embodiment, and the layer thickness of the chrome-free intermediate layer 4 can measure 0.2 to 1 μm in the exemplary embodiment.

[0022] A bonding layer 5 is applied to the chrome-free intermediate layer 4. According to the disclosure, this bonding layer 5 is applied via plasma coating, and specifically preferably with a plasma coating device 6 shown on FIG. 3. The thickness of the bonding layer 5 can best measure 2 to 8 μm in the exemplary embodiment.—After the bonding layer 5 has been applied to the pipe 1, an outer layer 7 is preferably applied, which preferably and in the exemplary embodiment consists of polyamide or essentially of polyamide. The layer thickness of the outer layer 7 can measure 1 to 2 mm in the exemplary embodiment.

[0023] FIG. 3 shows a preferred embodiment of a plasma coating device 6, with which the bonding layer 5 is preferably applied to the pipe 1 via plasma coating. The electrode 8 of the plasma coating device 6 as well as the gas supply 9 are visible. The plasma coating device 6 has a channel 10, through which the material for the bonding layer 5 can be introduced in powder form. The material is then converted into the gas phase with the device 6, and finally applied to the pipe 1 as a bonding layer 5 in solid form. Also visible on FIG. 3 is the plasma jet 11 of the plasma coating device 6.