EP1573082A1 - Method and arrangement for treating the inner surface of a copper or copper alloy pipe - Google Patents

Method and arrangement for treating the inner surface of a copper or copper alloy pipe

Info

Publication number
EP1573082A1
EP1573082A1 EP03775422A EP03775422A EP1573082A1 EP 1573082 A1 EP1573082 A1 EP 1573082A1 EP 03775422 A EP03775422 A EP 03775422A EP 03775422 A EP03775422 A EP 03775422A EP 1573082 A1 EP1573082 A1 EP 1573082A1
Authority
EP
European Patent Office
Prior art keywords
pipes
temperature reactor
copper
coating
inner pipe
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.)
Withdrawn
Application number
EP03775422A
Other languages
German (de)
French (fr)
Inventor
Aleksi Salminen
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.)
Cupori Group Oy
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of EP1573082A1 publication Critical patent/EP1573082A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/08—Tin or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising

Definitions

  • the invention relates to a method and arrangement defined in the preambles of the independent claims for coating copper or copper alloy pipes.
  • the dissolution of the copper from pipe for instance in household water has been effectively restricted and prevented by coating the inner surface of the copper pipe for example by tin, which provides a cathodic protection for the copper.
  • Tin is non-toxic, has a good corrosion resistance and a good appearance, and owing to these properties it has been widely used as a protective coating for metals.
  • a prerequisite for a successful coating is a carefully performed pretreatment of the surface to be coated. The purpose of the pretreatment is to remove the fabrication grease and carbon films that are accumulated on the pipe during the earlier manufacturing steps.
  • pretreatments it is well-known to use acids or other strong solutions with several rinsing steps before coating.
  • Known prior art solution pretreatment processes are alkaline cleaning, acid cleaning, surface activation and preliminary coating.
  • the pretreatment is carried out by a mechanical cleaning method, for instance by sand blasting.
  • copper pipes are bright annealed in a normal process.
  • oxygenous air is removed from the pipe by vacuum treatments and gas circulations, and the air is replaced by an oxygen-free gas, which is fed in to prevent the inner surface from oxidation.
  • the pipes are annealed, and the fabrication greases start to vaporize, whereafter the vaporized particles are removed from the pipe by a powerful protective gas circulation.
  • the fabrication grease still leaves a very thin and compact carbon film on the inner pipe wall, and tin coating cannot be applied directly on the wall without pretreatment.
  • the object of the invention is to introduce a new solution for performing the pretreatment applied in the interior coating of copper or copper alloy pipes.
  • solvent pretreatment methods can be replaced by pretreating the copper pipe in connection with the normal production, so that an oxidized layer is created on the inner pipe surface.
  • the invention relates to a method for coating the interior wall of copper or copper alloy pipes by a protective film, particularly a tin film, according to which method the pipes are before coating subjected to a pretreatment, where the pipes are treated in at least one temperature reactor, so that on the inner pipe surface, there is created an oxidized layer.
  • on the inner pipe surfaces there is blasted process gas for burning the carbon-bearing materials contained on the inner pipe surfaces and for oxidizing the copper.
  • the fabrication greases are burned in the presence of oxygen, so that they are combusted into carbon dioxide or other corresponding compounds.
  • the inner pipe surface is oxidized, which provides an advantageous base for the tin coating.
  • process gas is blasted on the inner pipe surfaces before the temperature reactor.
  • process gas is blasted on the inner pipe surfaces in the temperature reactor.
  • pipes are insulated against the exterior atmosphere before feeding the pipes in the temperature reactor.
  • pipes are insulated against the exterior atmosphere so that they are closed at both ends by welding.
  • the process gas blasted on the inner pipe surfaces contains 21 % oxygen, and the rest is nonreactant gas.
  • the process gas contains more than 21 % oxygen, and the rest is nonreactant gas.
  • the process gas contains less than 21 % oxygen, and the rest is nonreactant gas.
  • the pipes are heated at the temperature of 100 - 1000 degrees Centigrade, preferably at 500 - 800 degrees Centigrade.
  • the pipes are heated in the temperature reactor preferably for 0 - 50 minutes.
  • the pipes are inserted essentially completely in the temperature reactor.
  • the pipes are inserted in the temperature reactor, so that part of the pipes is left outside the reactor.
  • the oxidized layer created during the pretreatment step is composed of at least one compound, which is created when oxygen reacted with copper, such as the copper oxidule (Cu 2 0) of univalent copper (Cu + ) and/or the copper oxide (CuO) of bivalent copper (Cu 2+ ).
  • the pipes are coated by a tin film immediately after the pretreatment. It also is possible that the pipes are stored and coated by tin film in a separate process.
  • the pipes are cooled before coating with tin.
  • the inner pipe surfaces are cleaned prior to the tin coating. In the cleaning step, there are removed possible oxidation scales and other solid particles created in overoxidation, before starting the tin coating step.
  • the pipes are pressure cleaned by cleaning gas.
  • pipes are pressure cleaned by cleaning liquid.
  • the pipes can also be subjected to straightening and shaping treatments before or after tin coating.
  • One alternative is to employ an induction furnace as the temperature reactor.
  • the invention also relates to an arrangement for coating the inner surface of copper or copper alloy pipes by a protective film, particularly by a tin film, so that before the coating, the pipes are subjected to a pretreatment, and the arrangement used in the pretreatment comprises means for supplying process gas onto the inner pipe surfaces, and at least one temperature reactor for heating the pipes, so that on the inner pipe surface, there is created an oxidized layer.
  • the method and arrangement according to the invention in the pretreatment of copper or copper alloy pipes, the harmful multi-step prior art solution treatments can be avoided, and the pretreatment process itself is speeded up.
  • Another advantage of the pretreatment process according to the invention is that the appearance or other properties of the pipe, such as hardness or softness, are not set as obstacles for performing the pretreatment.
  • FIG. 1 A method according to the invention, illustrated as a diagram in principle
  • FIGS 1 and 2 there is illustrated as a diagram in principle a method according to the invention for pretreating hard copper pipes, either straight pipes 1 or pipe coils 8, in preparation for coating the inner pipe surfaces by tin.
  • the straight pipes 1 are longer than the nominal measure by the length of the deformation allowance.
  • the inner pipe surfaces contain impurities, such as drawing oil.
  • the example blasted process gas 2 containing oxygen in a batch of 21%, and the rest is nonreactant gas.
  • the process gas is meant for burning the carbon-bearing materials contained on the inner pipe surface, and for oxidizing the copper.
  • the pipes that are closed by welding are transferred to be treated in a temperature reactor 4, where the pipes are heated preferably at the temperature of 600 degrees for the duration of 10 minutes.
  • the employed temperature reactor is any known closed-circuit temperature reactor, where the pipes can be heated at different temperatures for the required duration.
  • the oxygen contained in the process gas reacts with the carbon contained in the drawing oils into carbon dioxide, and the excess oxygen reacts with the copper, creating an oxidized layer and binding the free copper atoms of the surface against further contaminations.
  • the pipes can be installed in the temperature reactor either all at the same time or one by one. In connection with the temperature reactor, there also are removed the lubricants 6 that were vaporized in the annealing process.
  • the size of the temperature reactor is designed to be in proportion to the number and size of the pipes to be processed.
  • the pipes are cooled in the cooling unit 5 for a desired duration before the tin coating step. According to the example, the pipes are cleaned in a cleaning unit 9 by pressurized cleaning gas of solid particles that are possibly left on the inner pipe surfaces. In the temperature reactor treatment, the inner surface of a copper pipe becomes an ideal base for tin coating.
  • the pipes are either transferred to a storage to wait for the tin coating, or directly to be tin-coated in the tin coating process 7.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Vapour Deposition (AREA)

Abstract

The invention relates to a method for coating the inner surface of copper or copper alloy pipes (1) with a protective film, particularly a tin film, according to which method the pipes are subjected to a pretreatment before coating; in the pretreatment step, the pipes are treated in at least one temperature reactor (4), so that an oxidized layer is created on the inner pipe surface. In addition the invention relates to an arrangement for coating the inner surface of copper or copper alloy pipes with a protective film, particularly a tin film, so that the pipes are subjected to a pretreatment before coating; the arrangement used in the pretreatment comprises means for feeding the process gas (2) on the inner pipe surfaces and at least one temperature reactor for heating the pipes, so that an oxidized layer is created on the inner pipe surfaces.

Description

METHOD AND ARRANGEMENT FOR TREATING THE INNER SURFACE OF A COPPER OR COPPER ALLOY PIPE
The invention relates to a method and arrangement defined in the preambles of the independent claims for coating copper or copper alloy pipes.
Certain components that are dissolved in clean water in exceptional conditions, such as ions of various salts, result in the dissolution of copper in water-supply pipes made of copper. The dissolution of the copper from pipe for instance in household water has been effectively restricted and prevented by coating the inner surface of the copper pipe for example by tin, which provides a cathodic protection for the copper. Tin is non-toxic, has a good corrosion resistance and a good appearance, and owing to these properties it has been widely used as a protective coating for metals. A prerequisite for a successful coating is a carefully performed pretreatment of the surface to be coated. The purpose of the pretreatment is to remove the fabrication grease and carbon films that are accumulated on the pipe during the earlier manufacturing steps.
In the pretreatments, it is well-known to use acids or other strong solutions with several rinsing steps before coating. Known prior art solution pretreatment processes are alkaline cleaning, acid cleaning, surface activation and preliminary coating. For straight, semi-hard pipes, the pretreatment is carried out by a mechanical cleaning method, for instance by sand blasting.
From the Finnish patent application 20001467, there is known a method for coating a copper or copper alloy pipe internally by a protective film, particularly a tin film. The method is characterized in that prior to the coating treatment, the inner surface of the pipe is mechanically pretreated.
From the US patent 4,393,566 there is known a method and arrangement for removing oily and carbon-containing deposits from the inner surface of copper tubing. In particular, the method according to the invention relates to removing the drawing oils used in drawing by processing the tubing in an annealing furnace.
Often when a tin coating fails, the reasons lie in a lacking pretreatment. In the prior art pretreatments applied when tin coating copper pipes or copper alloy pipes, the drawback has been the use of strong chemicals, as well as the rinsing steps required by these chemicals. The use of chemicals results in problems connected both to safety at work and environmental protection. With known pretreatment methods, the requirement for a successful coating is an immediate coating of an active surface, so that a recontamination of the surface is avoided.
According to a known method, copper pipes are bright annealed in a normal process. In that case, oxygenous air is removed from the pipe by vacuum treatments and gas circulations, and the air is replaced by an oxygen-free gas, which is fed in to prevent the inner surface from oxidation. After that, the pipes are annealed, and the fabrication greases start to vaporize, whereafter the vaporized particles are removed from the pipe by a powerful protective gas circulation. However, the fabrication grease still leaves a very thin and compact carbon film on the inner pipe wall, and tin coating cannot be applied directly on the wall without pretreatment.
The object of the invention is to introduce a new solution for performing the pretreatment applied in the interior coating of copper or copper alloy pipes.
The invention is characterized by what is set forth in the characterizing parts of the independent claims. Preferred embodiments of the invention are characterized by what is set forth in the other claims.
According to the invention, solvent pretreatment methods can be replaced by pretreating the copper pipe in connection with the normal production, so that an oxidized layer is created on the inner pipe surface. In particular, the invention relates to a method for coating the interior wall of copper or copper alloy pipes by a protective film, particularly a tin film, according to which method the pipes are before coating subjected to a pretreatment, where the pipes are treated in at least one temperature reactor, so that on the inner pipe surface, there is created an oxidized layer. According to the invention, on the inner pipe surfaces there is blasted process gas for burning the carbon-bearing materials contained on the inner pipe surfaces and for oxidizing the copper. Thus the fabrication greases are burned in the presence of oxygen, so that they are combusted into carbon dioxide or other corresponding compounds. At the same time the inner pipe surface is oxidized, which provides an advantageous base for the tin coating. Preferably according to the invention, on the inner pipe surface there is blasted so much oxygen that it suffices both for burning the carbon-bearing fabrication greases and for oxidizing the copper. According to a preferred embodiment of the invention, process gas is blasted on the inner pipe surfaces before the temperature reactor. According to another preferred embodiment of the invention, process gas is blasted on the inner pipe surfaces in the temperature reactor. According to the invention, pipes are insulated against the exterior atmosphere before feeding the pipes in the temperature reactor. According to a preferred embodiment, pipes are insulated against the exterior atmosphere so that they are closed at both ends by welding. Thus the exterior pipe surface can be kept clear, and the oxygen-free protective gas of the temperature reactor cannot displace the oxygenous air in the pipe.
According to a preferred embodiment of the invention, the process gas blasted on the inner pipe surfaces contains 21 % oxygen, and the rest is nonreactant gas. According to another preferred embodiment of the invention, the process gas contains more than 21 % oxygen, and the rest is nonreactant gas. According to another preferred embodiment of the invention, the process gas contains less than 21 % oxygen, and the rest is nonreactant gas. According to the invention, in the temperature reactor the pipes are heated at the temperature of 100 - 1000 degrees Centigrade, preferably at 500 - 800 degrees Centigrade. According to the invention, the pipes are heated in the temperature reactor preferably for 0 - 50 minutes. When operating in the above described conditions, the fabrication greases are removed from the inner copper pipe surface, and the surface is advantageously oxidized. According to a preferred embodiment, the pipes are inserted essentially completely in the temperature reactor. According to another embodiment, the pipes are inserted in the temperature reactor, so that part of the pipes is left outside the reactor. The oxidized layer created during the pretreatment step is composed of at least one compound, which is created when oxygen reacted with copper, such as the copper oxidule (Cu20) of univalent copper (Cu+) and/or the copper oxide (CuO) of bivalent copper (Cu2+). By this method, there is achieved an advantageous base for the tin coating, with respect to the dissolving quality of the copper ion. According to the invention, a tin layer is created on top of the oxidized layer. According to a preferred embodiment of the invention, the pipes are coated by a tin film immediately after the pretreatment. It also is possible that the pipes are stored and coated by tin film in a separate process. According to a preferred embodiment of the invention, the pipes are cooled before coating with tin. According to a preferred embodiment, the inner pipe surfaces are cleaned prior to the tin coating. In the cleaning step, there are removed possible oxidation scales and other solid particles created in overoxidation, before starting the tin coating step. According to a preferred embodiment of the invention, the pipes are pressure cleaned by cleaning gas. According to another preferred embodiment of the invention, pipes are pressure cleaned by cleaning liquid.
The pipes can also be subjected to straightening and shaping treatments before or after tin coating. One alternative is to employ an induction furnace as the temperature reactor. The invention also relates to an arrangement for coating the inner surface of copper or copper alloy pipes by a protective film, particularly by a tin film, so that before the coating, the pipes are subjected to a pretreatment, and the arrangement used in the pretreatment comprises means for supplying process gas onto the inner pipe surfaces, and at least one temperature reactor for heating the pipes, so that on the inner pipe surface, there is created an oxidized layer. Advantageously by applying the method and arrangement according to the invention in the pretreatment of copper or copper alloy pipes, the harmful multi-step prior art solution treatments can be avoided, and the pretreatment process itself is speeded up. Another advantage of the pretreatment process according to the invention is that the appearance or other properties of the pipe, such as hardness or softness, are not set as obstacles for performing the pretreatment.
The invention is described in more detail below with reference to the appended drawings.
Figure 1 A method according to the invention, illustrated as a diagram in principle
Figure 2 Another preferred embodiment of the invention
In figures 1 and 2, there is illustrated as a diagram in principle a method according to the invention for pretreating hard copper pipes, either straight pipes 1 or pipe coils 8, in preparation for coating the inner pipe surfaces by tin. In the example according to figure 1 , the straight pipes 1 are longer than the nominal measure by the length of the deformation allowance. Often the inner pipe surfaces contain impurities, such as drawing oil. On the inner pipe surfaces, there is according to the example blasted process gas 2 containing oxygen in a batch of 21%, and the rest is nonreactant gas. The process gas is meant for burning the carbon-bearing materials contained on the inner pipe surface, and for oxidizing the copper. Thereafter the pipe ends are closed by welding 3, so that the process gas contained in the pipe cannot be exhausted, and the inner pipe surface does not get into contact with the exterior atmosphere. The pipes that are closed by welding are transferred to be treated in a temperature reactor 4, where the pipes are heated preferably at the temperature of 600 degrees for the duration of 10 minutes. The employed temperature reactor is any known closed-circuit temperature reactor, where the pipes can be heated at different temperatures for the required duration. The oxygen contained in the process gas reacts with the carbon contained in the drawing oils into carbon dioxide, and the excess oxygen reacts with the copper, creating an oxidized layer and binding the free copper atoms of the surface against further contaminations. The accumulation of an oxidized layer on the bare copper surface begins through copper oxidule (Cu20), which further reacts in the presence of oxygen into copper oxide (CuO). Varying conditions affect in which compound ends up as the main compound on the copper surface. If there is available only a small quantity of oxygen, a low temperature and a short oxidation period, the layer created on the surface is mainly composed of copper oxidule.
The pipes can be installed in the temperature reactor either all at the same time or one by one. In connection with the temperature reactor, there also are removed the lubricants 6 that were vaporized in the annealing process. The size of the temperature reactor is designed to be in proportion to the number and size of the pipes to be processed. The pipes are cooled in the cooling unit 5 for a desired duration before the tin coating step. According to the example, the pipes are cleaned in a cleaning unit 9 by pressurized cleaning gas of solid particles that are possibly left on the inner pipe surfaces. In the temperature reactor treatment, the inner surface of a copper pipe becomes an ideal base for tin coating. The pipes are either transferred to a storage to wait for the tin coating, or directly to be tin-coated in the tin coating process 7.
In the example according to figure 2, from a pipe coil 8 there is continuously fed pipe in the temperature reactor 4. Before the temperature reactor 4, on the inner pipe surface there is blasted process gas 2 that contains oxygen in a batch of over 21 %. In the temperature reactor, there are removed created lubricant vapors 6. From the temperature reactor, pipe is pulled out to be cooled in the cooling unit 5 at the same pace as the pipe after the desired time is released from the treatment of the temperature reactor. After the temperature reactor treatment, the pipe can be worked into the desired shape, and when requested, the pipe can be cut into separate pipes of a given length prior to the tin coating step 7, or it can be transferred into tin coating as a pipe coil. In figures 1 and 2, the pipe 1 and the pipe coil 8 can in their outer dimensions, clearance and length be remarkably larger than the final length obtained after the tin coating step. The final diameter and length of the pipe can also be defined after the coating.
For a man skilled in the art it is obvious that the various preferred embodiments of the invention are not restricted to the above described examples only, but may vary within the scope of the appended claims.

Claims

1. A method for coating the inner surface of copper or copper alloy pipes with a protective film, particularly a tin film, according to which method the pipes are subjected to a pretreatment before coating, characterized in that in the pretreatment step, the pipes are treated in at least one temperature reactor, so that an oxidized layer is created on the inner pipe surface.
2. A method according to claim 1 , characterized in that on the inner pipe surface, there is blasted process gas in order to burn the carbon-bearing materials accumulated on the inner pipe surfaces and in order to oxidize the copper.
3. A method according to claim 2, characterized in that process gas is blasted on the inner pipe surfaces before the temperature reactor.
4. A method according to claim 2, characterized in that process gas is blasted on the inner pipe surfaces in the temperature reactor.
5. A method according to any of the claims 1 - 4, characterized in that the pipes are insulated against the exterior atmosphere before inserting the pipes in the temperature reactor.
6. A method according to claim 5, characterized in that the pipes are insulated against the exterior atmosphere by closing the pipes at both ends by welding.
7. A method according to claim 2, 3 or 4, characterized in that the process gas contains 21% oxygen, and the rest is nonreactant gas. A method according to claim 2, 3 or 4, characterized in that the process gas contains over 21 % oxygen, and the rest is nonreactant gas.
A method according to claim 2, 3 or 4, characterized in that the process gas contains less than 21% oxygen, and the rest is nonreactant gas.
A method according to claim 1 , 3, 4 or 5, characterized in that in the temperature reactor, the pipes are heated at 100 - 1000 degrees Centigrade.
A method according to claim 1 , 3, 4 or 5, characterized in that in the temperature reactor, the pipes are heated preferably at 500 - 800 degrees Centigrade.
A method according to claim 1 , 3, 4, 5, 10 or 11 , characterized in that the pipes are heated in the temperature reactor preferably for 0 - 50 minutes.
A method according to claim 1 , 3, 4, 5, 10, 11 or 12, characterized in that the pipes are inserted in the temperature reactor essentially completely.
A method according to claim 1 , 3, 4, 5, 10, 11 or 12, characterized in that the pipes are inserted in the temperature reactor, so that part of them is left outside the temperature reactor.
A method according to claim 1 , characterized in that the oxidized layer created in the pretreatment step is composed of at least one compound, which created when oxygen reacted with copper.
A method according to any of the preceding claims, characterized in that on top of the oxidized layer, there is created a tin layer. A method according to any of the preceding claims, characterized in that the pipes are coated with a tin film immediately after the pretreatment step.
A method according to any of the claims 1 - 16, characterized in that the pipes are stored and coated with a tin film in a separate process.
A method according to claim 1 - 16 or 18, characterized in that the pipes are cooled before the tin coating.
A method according to claim 1 - 16, 18 or 19, characterized in that the inner surfaces of the pipes are cleaned before the tin coating.
A method according to claim 20, characterized in that the pipes are pressure cleaned by cleaning gas.
A method according to claim 20, characterized in that the pipes are pressure cleaned by cleaning liquid
A method according to claim 1 - 22, characterized in that the pipes are subjected to straightening and shaping treatments before the tin coating.
A method according to claim 1 - 22, characterized in that the pipes are subjected to straightening and shaping treatments after the tin coating.
A method according to claim 1 , 3, 4, 5, 10, 11 , 12, 13 or 14, characterized in that the employed temperature reactor is an induction furnace.
An arrangement for coating the inner surface of copper or copper alloy pipes with a protective film, particularly a tin film, so that the pipes are subjected to a pretreatment before coating, characterized in that the arrangement used in the pretreatment comprises means for feeding the process gas on the inner pipe surfaces and at least one temperature reactor for heating the pipes, so that an oxidized layer is created on the inner pipe surfaces.
EP03775422A 2002-12-18 2003-11-24 Method and arrangement for treating the inner surface of a copper or copper alloy pipe Withdrawn EP1573082A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20022216A FI120359B (en) 2002-12-18 2002-12-18 Method and apparatus for treating an inner surface of a copper or copper alloy tube
FI20022216 2002-12-18
PCT/FI2003/000897 WO2004055230A1 (en) 2002-12-18 2003-11-24 Method and arrangement for treating the inner surface of a copper or copper alloy pipe

Publications (1)

Publication Number Publication Date
EP1573082A1 true EP1573082A1 (en) 2005-09-14

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EP03775422A Withdrawn EP1573082A1 (en) 2002-12-18 2003-11-24 Method and arrangement for treating the inner surface of a copper or copper alloy pipe

Country Status (6)

Country Link
EP (1) EP1573082A1 (en)
AU (1) AU2003283454A1 (en)
EA (1) EA011199B1 (en)
FI (1) FI120359B (en)
TW (1) TW200416303A (en)
WO (1) WO2004055230A1 (en)

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CN116970893B (en) * 2023-04-25 2024-04-30 先之科半导体科技(东莞)有限公司 Improved straightening assembly

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Publication number Publication date
AU2003283454A1 (en) 2004-07-09
EA200500551A1 (en) 2006-02-24
EA011199B1 (en) 2009-02-27
TW200416303A (en) 2004-09-01
FI20022216A7 (en) 2004-06-19
FI120359B (en) 2009-09-30
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