EP2518188A1 - Process for treating a line component - Google Patents

Process for treating a line component Download PDF

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Publication number
EP2518188A1
EP2518188A1 EP12162802A EP12162802A EP2518188A1 EP 2518188 A1 EP2518188 A1 EP 2518188A1 EP 12162802 A EP12162802 A EP 12162802A EP 12162802 A EP12162802 A EP 12162802A EP 2518188 A1 EP2518188 A1 EP 2518188A1
Authority
EP
European Patent Office
Prior art keywords
component
coating
line
oxygen
coating material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12162802A
Other languages
German (de)
French (fr)
Other versions
EP2518188B1 (en
Inventor
Sabine Sievers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide Deutschland GmbH
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide Deutschland GmbH
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Liquide Deutschland GmbH, Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide Deutschland GmbH
Publication of EP2518188A1 publication Critical patent/EP2518188A1/en
Application granted granted Critical
Publication of EP2518188B1 publication Critical patent/EP2518188B1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies

Definitions

  • the present invention relates to a process for treating a component for a line for conducting oxygen.
  • the invention relates to a process in which a coating is applied to a surface of the component which is in contact with oxygen during operation of the line.
  • carbon steel and high-grade steel are proposed as components for conducting the gaseous oxygen if personnel are prevented from accessing the lines at the installation site of the components by, for example, barriers.
  • barriers are not always approvable or permissible and access during operation of the pipelines for monitoring, maintenance or repair measures is not possible or not permitted.
  • the invention proposes a process for treating a component for a line for conducting oxygen, in which process a coating of a coating material is applied by electroplating at least to the surface of the component which is in contact with the oxygen during operation of the line, preferably also the entire surface.
  • the process can also be used for coating components for apparatuses in which use is made of a gas having an oxygen content of more than 23.5% by volume.
  • oxygen is conducted in particular at a pressure of greater than 1 bar or even greater than 11 bar.
  • the component for a line for conducting oxygen is, in particular, a pipe, a flange, a valve, a trap, a slide, a bend, a T-piece, a filter, a compressor and/or a piston.
  • the coating is applied to the component by electroplating.
  • the component is provided, after chemical pretreatment for cleaning the surface of the component, in a liquid bath, in particular an electrolytic liquid bath.
  • the component is connected to the negative terminal of a voltage source and thus forms the cathode.
  • the coating material is likewise provided in the liquid bath and is connected to the positive terminal of the voltage source, as a result of which the coating material forms the anode.
  • a current is produced between the coating material and the component, as a result of which ions of the coating material are released from the anode.
  • These ions of the coating material flow to the component, where they form a coating on the surface of the component by cathodic deposition. In particular, a bond is established between the component and the coating material by reduction.
  • only specific surface regions of the component can be coated.
  • a voltage such that a current having a current density of 0.5 to 10 A/dm 2 [ampere per square decimetre], particularly preferably of 1 to 4 A/dm 2 , flows.
  • a current having a current density of 0.5 to 10 A/dm 2 [ampere per square decimetre], particularly preferably of 1 to 4 A/dm 2 flows.
  • the process according to the invention makes it possible to produce components for gaseous oxygen at high pressure very cost-effectively, and therefore no barriers during operation of the pipeline or expensive substitute materials are required.
  • the electroplating establishes a bond between the component and the coating which prevents the nickel layer from becoming detached even under tensile and bending test loading and during separation, as a result of which the coated components also have very good mechanical properties. On account of the mechanical properties, no particles of the coating pass into the line even when the line is being processed.
  • the surface of the component is depicted exactly by the electroplating. It is also possible to coat components having geometries which cannot be coated by plasma spraying.
  • the component preferably comprises at least one of the following materials:
  • the surface which is in contact with the oxygen during operation of the line is therefore produced from one of these materials.
  • the material preferably has a thickness of at least 0.1 mm [millimetre] or even of at least 20 mm.
  • the coating has a layer thickness of at most 10 mm, particularly preferably of at most 5 mm.
  • a coating having a layer thickness of at least 0.5 ⁇ m [micrometre], preferably of at least 2 ⁇ m, or even at least 10 ⁇ m should be applied. This also achieves a high resistance to wear.
  • the coating material preferably has a nickel content of at least 99% by weight, particularly preferably of at least 99.2% by weight, very preferably of at least 99.9% by weight. Nickel is suitable and permitted in particular for use in lines for conducting oxygen.
  • Components having a length of at least 2 m [metre], particularly preferably of at least 5 m and up to 10 m, are preferably also treated by the electroplating.
  • the electroplating is therefore also suitable for coating components having large dimensions.
  • Figure 1 schematically shows a cross section through a liquid bath 8 for electroplating a component 1.
  • the component 1 is a pipe having a length 6 and has a surface 2 on the inner side.
  • the component 1 is connected to the negative terminal of a voltage source 7.
  • the positive terminal of the voltage source 7 is connected to a coating material 4, which is arranged in the pipe and thus forms the anode.
  • a coating 3 is applied between the component 1 as electrode and the coating material 4 as anode.
  • the current induced by the voltage between the coating material 4 and the component 1 through the liquid bath 8 releases ions of the coating material 4, which flow through the electrical field to the component 1.
  • the ions of the coating material 4 arrive at the surface 2 of the component 1, where they form a coating 3 by reduction.
  • the coating 3 has a layer thickness 5 which, in this case, is applied uniformly on the surface 2 of the component 1.
  • the layer thickness 5 is at most 10 mm.
  • the electroplating is ended when a predefinable layer thickness has been reached.
  • the coating material is made of high-purity nickel, with a nickel content of at least 99.2% by weight.
  • FIG. 2 shows a line 12 for conducting oxygen.
  • the line 12 comprises pipes 9 and a valve 10 with a spindle 11 including a closing plate.
  • the surfaces 2 of the pipes 9 and of the valve 10 which are in contact with oxygen during operation of the line 12 have a nickel coating, which was applied by the process according to the invention.
  • the process according to the invention establishes a bond between the coating 3 and the component 1 which withstands even the greatest mechanical demands and therefore makes reliable operation of a line for gaseous oxygen possible.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The present invention relates to a process for treating a component (1) for a line for conducting oxygen. A coating (3) of a coating material (4) is applied by electroplating at least to the surface (2) of the component (1) which is in contact with the oxygen during operation of the line.
The process according to the invention establishes a bond between the coating (3) and the component (1) which withstands even the greatest mechanical demands and therefore makes reliable operation of a line for gaseous oxygen possible.

Description

  • The present invention relates to a process for treating a component for a line for conducting oxygen. In particular, the invention relates to a process in which a coating is applied to a surface of the component which is in contact with oxygen during operation of the line.
  • For transporting gaseous oxygen at pressures of up to several 10s of bars, use is made of components such as, for example, pipelines, bends, T-pieces and/or fittings made of carbon steel or high-grade steel. Carbon steel and high-grade steel are not recommended for pressure ranges in the case of flowing oxygen above, for example, 1 bar and 11 bar, respectively, depending on the flow rate (see EIGA/CGA). At pressures or rates above these limit values, it is possible to use components made of expensive substitute materials which, however, are difficult to obtain, for example Monel 400, a nickel-copper alloy. However, in Germany, for example, special reports or permits are required for the use of materials other than carbon steel and high-grade steel for pipelines for conducting oxygen.
  • Alternatively, in this pressure range carbon steel and high-grade steel are proposed as components for conducting the gaseous oxygen if personnel are prevented from accessing the lines at the installation site of the components by, for example, barriers. These barriers, however, are not always approvable or permissible and access during operation of the pipelines for monitoring, maintenance or repair measures is not possible or not permitted.
  • In addition, it is clear from the guidelines/recommendations (EIGA/CGA) that components of the line made of high-grade steel or carbon steel having a coating of pure nickel are preferred for conducting gaseous oxygen up to 207 bar. In this context, it is known from US 2009/0007967 A1 to apply a nickel layer to carbon steel or high-grade steel pipes by means of plasma spraying. In the case of pipes having a 90° bend, for example, plasma spraying can however only be used with difficulty, and in addition plasma spraying can only be used for components having an overall length of up to 1.8 m. In addition, it has been found that the nickel layer applied by plasma spraying can spall and be completely destroyed during tensile and bending tests and also during separating operations.
  • It is therefore an object of the invention to at least partially solve the problems outlined with reference to the prior art and, in particular, to specify a process with which components of a line for conducting oxygen can be coated with nickel, such that the nickel layer remains intact even in the event of mechanical loading.
  • These objects are achieved by a process according to the features of Patent Claim 1. Further advantageous configurations of the process are specified in the dependent patent claims. The features given individually in the patent claims may be combined with one another in any desired, technologically feasible way and may be supplemented with explanatory information from the description, in which case further alternative embodiments of the invention are presented.
  • In particular, the invention proposes a process for treating a component for a line for conducting oxygen, in which process a coating of a coating material is applied by electroplating at least to the surface of the component which is in contact with the oxygen during operation of the line, preferably also the entire surface. Furthermore, the process can also be used for coating components for apparatuses in which use is made of a gas having an oxygen content of more than 23.5% by volume.
  • In the line, oxygen is conducted in particular at a pressure of greater than 1 bar or even greater than 11 bar. The component for a line for conducting oxygen is, in particular, a pipe, a flange, a valve, a trap, a slide, a bend, a T-piece, a filter, a compressor and/or a piston.
  • According to the invention, the coating is applied to the component by electroplating. For this purpose, the component is provided, after chemical pretreatment for cleaning the surface of the component, in a liquid bath, in particular an electrolytic liquid bath.
  • The component is connected to the negative terminal of a voltage source and thus forms the cathode. The coating material is likewise provided in the liquid bath and is connected to the positive terminal of the voltage source, as a result of which the coating material forms the anode. On application of a DC voltage, a current is produced between the coating material and the component, as a result of which ions of the coating material are released from the anode. These ions of the coating material flow to the component, where they form a coating on the surface of the component by cathodic deposition. In particular, a bond is established between the component and the coating material by reduction. On account of an appropriate arrangement and/or coverage of the component or arrangement of the coating material in the liquid bath, only specific surface regions of the component can be coated. It is preferable to apply a voltage such that a current having a current density of 0.5 to 10 A/dm2 [ampere per square decimetre], particularly preferably of 1 to 4 A/dm2, flows. In the case of these currents, the introduction of hydrogen, which could lead to hydrogen embrittlement of the component, is virtually avoided.
  • The process according to the invention makes it possible to produce components for gaseous oxygen at high pressure very cost-effectively, and therefore no barriers during operation of the pipeline or expensive substitute materials are required. The electroplating establishes a bond between the component and the coating which prevents the nickel layer from becoming detached even under tensile and bending test loading and during separation, as a result of which the coated components also have very good mechanical properties. On account of the mechanical properties, no particles of the coating pass into the line even when the line is being processed. In addition, the surface of the component is depicted exactly by the electroplating. It is also possible to coat components having geometries which cannot be coated by plasma spraying.
  • The component preferably comprises at least one of the following materials:
    • carbon steel,
    • austenitic steel,
    • ferritic steel,
    • cast iron,
    • malleable cast iron,
    • chromium-nickel alloy,
    • aluminium,
    • copper,
    • copper alloy,
    • non-metallic material,
    • glass,
    • plastic,
    • carbon fibre-reinforced plastic.
  • In particular, the surface which is in contact with the oxygen during operation of the line is therefore produced from one of these materials. In this case, the material preferably has a thickness of at least 0.1 mm [millimetre] or even of at least 20 mm.
  • It is advantageous if the coating has a layer thickness of at most 10 mm, particularly preferably of at most 5 mm. In particular, a coating having a layer thickness of at least 0.5 µm [micrometre], preferably of at least 2 µm, or even at least 10 µm should be applied. This also achieves a high resistance to wear.
  • The coating material preferably has a nickel content of at least 99% by weight, particularly preferably of at least 99.2% by weight, very preferably of at least 99.9% by weight. Nickel is suitable and permitted in particular for use in lines for conducting oxygen.
  • Components having a length of at least 2 m [metre], particularly preferably of at least 5 m and up to 10 m, are preferably also treated by the electroplating. The electroplating is therefore also suitable for coating components having large dimensions.
  • The invention and the technical context will be explained below in more detail with reference to the figure. It should be pointed out that the figure shows a particularly preferred alternative embodiment of the invention, but the invention is not limited thereto. Schematically:
    • Figure 1: shows the electroplating of a component, and
    • Figure 2: shows a line for conducting oxygen.
  • Figure 1 schematically shows a cross section through a liquid bath 8 for electroplating a component 1. In the exemplary embodiment shown here, the component 1 is a pipe having a length 6 and has a surface 2 on the inner side. The component 1 is connected to the negative terminal of a voltage source 7. The positive terminal of the voltage source 7 is connected to a coating material 4, which is arranged in the pipe and thus forms the anode. In order to apply a coating 3 to the surface 2 of the component 1, a voltage is applied between the component 1 as electrode and the coating material 4 as anode. The current induced by the voltage between the coating material 4 and the component 1 through the liquid bath 8 releases ions of the coating material 4, which flow through the electrical field to the component 1. The ions of the coating material 4 arrive at the surface 2 of the component 1, where they form a coating 3 by reduction. The coating 3 has a layer thickness 5 which, in this case, is applied uniformly on the surface 2 of the component 1. The layer thickness 5 is at most 10 mm. The electroplating is ended when a predefinable layer thickness has been reached. The coating material is made of high-purity nickel, with a nickel content of at least 99.2% by weight.
  • Figure 2 shows a line 12 for conducting oxygen. The line 12 comprises pipes 9 and a valve 10 with a spindle 11 including a closing plate. The surfaces 2 of the pipes 9 and of the valve 10 which are in contact with oxygen during operation of the line 12 have a nickel coating, which was applied by the process according to the invention.
  • The process according to the invention establishes a bond between the coating 3 and the component 1 which withstands even the greatest mechanical demands and therefore makes reliable operation of a line for gaseous oxygen possible.
    • List of reference numerals
    • 1
    Component
    2
    Surface
    3
    Coating
    4
    Coating material
    5
    Layer thickness
    6
    Length
    7
    Voltage source
    8
    Liquid bath
    9
    Pipe
    10
    Valve
    11
    Spindle with closing plate
    12
    Line

Claims (5)

  1. Process for treating a component (1) for a line for conducting oxygen, in which a coating (3) of a coating material (4) is applied by electroplating at least to the surface (2) of the component (1) which is in contact with the oxygen during operation of the line.
  2. Process according to Claim 1, wherein the component (1) comprises at least one of the following materials:
    - carbon steel,
    - austenitic steel,
    - ferritic steel,
    - cast iron,
    - malleable cast iron,
    - chromium-nickel alloy,
    - aluminium,
    - copper,
    - copper alloy,
    - non-metallic material,
    - glass,
    - plastic,
    - carbon fibre-reinforced plastic.
  3. Process according to either of the preceding claims, wherein the coating (3) has a layer thickness (5) of at most 10 mm.
  4. Process according to one of the preceding claims, wherein the coating material (3) has a nickel content of at least 99% by weight.
  5. Process according to one of the preceding claims, wherein the component (1) has a length (6) of at least 2 m.
EP12162802.8A 2011-04-29 2012-04-02 Process for treating a line component Active EP2518188B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011100100A DE102011100100A1 (en) 2011-04-29 2011-04-29 Method for treating a line component

Publications (2)

Publication Number Publication Date
EP2518188A1 true EP2518188A1 (en) 2012-10-31
EP2518188B1 EP2518188B1 (en) 2016-09-14

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EP12162802.8A Active EP2518188B1 (en) 2011-04-29 2012-04-02 Process for treating a line component

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DE (1) DE102011100100A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849084A (en) * 1987-05-14 1989-07-18 Framatome Tubular rod for the treatment of the inside surface of a tube
US20090007967A1 (en) 2005-03-03 2009-01-08 Emmanuel Fano Method of Coating a Pipe Element or Device Used to Convey Gaseous Oxygen
US20090252883A1 (en) * 2008-04-08 2009-10-08 Korea Atomic Energy Research Institute Method of preventing corrosion degradation using ni or ni-alloy plating

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB780073A (en) * 1954-06-23 1957-07-31 Birmingham Small Arms Co Ltd Improvements in or relating to valve-guides for internal combustion engines
GB1210765A (en) * 1968-04-10 1970-10-28 Eaton Yale & Towne Poppet valves for internal combustion engines
NL193727C (en) * 1984-10-05 2000-08-04 Secr Defence Metal-based coating and method of forming a metal coating on a substrate.
DE3716935A1 (en) * 1987-05-20 1988-12-01 Mtu Muenchen Gmbh METHOD FOR PRODUCING OXIDATION AND HOT GAS CORROSION PROTECTION LAYERS
DE3815976A1 (en) * 1988-05-10 1989-11-23 Mtu Muenchen Gmbh METHOD FOR PRODUCING GALVANICALLY SEPARATED HOT GAS CORROSION LAYERS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849084A (en) * 1987-05-14 1989-07-18 Framatome Tubular rod for the treatment of the inside surface of a tube
US20090007967A1 (en) 2005-03-03 2009-01-08 Emmanuel Fano Method of Coating a Pipe Element or Device Used to Convey Gaseous Oxygen
US20090252883A1 (en) * 2008-04-08 2009-10-08 Korea Atomic Energy Research Institute Method of preventing corrosion degradation using ni or ni-alloy plating

Also Published As

Publication number Publication date
DE102011100100A1 (en) 2012-10-31
EP2518188B1 (en) 2016-09-14

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