EP0683243A2 - Tube résistant à la corrosion ayant une couche d'oxyde interne - Google Patents

Tube résistant à la corrosion ayant une couche d'oxyde interne Download PDF

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Publication number
EP0683243A2
EP0683243A2 EP95107208A EP95107208A EP0683243A2 EP 0683243 A2 EP0683243 A2 EP 0683243A2 EP 95107208 A EP95107208 A EP 95107208A EP 95107208 A EP95107208 A EP 95107208A EP 0683243 A2 EP0683243 A2 EP 0683243A2
Authority
EP
European Patent Office
Prior art keywords
tube
corrosion
annealed
oxide layer
pipe according
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
EP95107208A
Other languages
German (de)
English (en)
Other versions
EP0683243A3 (fr
EP0683243B1 (fr
Inventor
Monika Dr. Dipl.-Ing. Breu
Klaus Dr.-Ing. Ohla
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.)
Wieland Werke AG
Original Assignee
Wieland Werke AG
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 Wieland Werke AG filed Critical Wieland Werke AG
Publication of EP0683243A2 publication Critical patent/EP0683243A2/fr
Publication of EP0683243A3 publication Critical patent/EP0683243A3/fr
Application granted granted Critical
Publication of EP0683243B1 publication Critical patent/EP0683243B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 corrosion-resistant tube made of a copper alloy, which is protected by at least one oxide layer.
  • a known method for increasing the corrosion resistance is the modification of the starting material by alloy formation. This option is used for special applications such as heavily polluted service water or sea water. Depending on the type and amount of the alloying elements - usually more concentrated alloys are used - this is expensive and the material is inevitably more difficult to form than pure copper, which also increases the production costs.
  • EPS 0.356.732 appropriate outer oxide layers are generated by appropriate annealing treatments.
  • these layers are very thin and therefore susceptible to mechanical damage. Due to the annealing treatment to create the protective layer, the material is always in a soft state. Hard pipes cannot be manufactured in this way.
  • the invention is therefore based on the object of providing a tube made of a copper alloy, the copper permeability of which is reduced by the formation of special oxide layers.
  • the tube consisting of a copper alloy with 0.01 to 1.0% of an alloyed element from the group aluminum, tin, zinc or silicon has inner oxide layers located under the inner and outer tube surface, each of which consist exclusively of the oxide of the alloyed element.
  • tubes made of low-alloy copper materials can be provided both in the hard and in the soft state.
  • the method for producing the corrosion-resistant tubes according to the invention is characterized in that the tube is annealed for at least one hour before or at the final dimension in a gas atmosphere with a low oxygen partial pressure at annealing temperatures above 600 ° C.
  • the oxygen partial pressure in the annealing atmosphere must be chosen to be as low as possible. In any case, the oxygen partial pressure must be lower than the equilibrium pressure of the following reaction: Cu2O ⁇ 2 Cu + 1/2 O2.
  • Annealing in hydrogen, nitrogen, forming gas (90% N2, 10% H2) or other gas mixtures is advisable.
  • the residual oxygen contents present at the usual levels of purity (eg 99.9%) are sufficient for the desired oxide formation. It is particularly advisable to carry out the annealing at 800 to 900 ° C for 6 to 12 hours.
  • the material Due to the necessary annealing, the material is initially in the recrystallized state. However, since the inner oxide layers can endure cold deformation of the base material to a certain extent without damage, the soft tubes can then be further consolidated with at least one pull, possibly several pulls, so that a hard state results. The inner layers remain in the material during forming, so they are protected against mechanical damage and chipping. They are even compressed by the forming and thus their protective effect is improved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat Treatment Of Articles (AREA)
EP95107208A 1994-05-19 1995-05-12 Tube résistant à la corrosion ayant une couche d'oxyde interne Expired - Lifetime EP0683243B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4417455 1994-05-19
DE4417455A DE4417455C2 (de) 1994-05-19 1994-05-19 Verwendung eines korrosionsbeständigen Rohres mit inneren Oxidschichten

Publications (3)

Publication Number Publication Date
EP0683243A2 true EP0683243A2 (fr) 1995-11-22
EP0683243A3 EP0683243A3 (fr) 1996-12-04
EP0683243B1 EP0683243B1 (fr) 1998-09-16

Family

ID=6518417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107208A Expired - Lifetime EP0683243B1 (fr) 1994-05-19 1995-05-12 Tube résistant à la corrosion ayant une couche d'oxyde interne

Country Status (3)

Country Link
EP (1) EP0683243B1 (fr)
DE (2) DE4417455C2 (fr)
ES (1) ES2123853T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159949C1 (de) * 2001-12-06 2003-05-22 Wieland Werke Ag Verwendung einer Kupfer-Aluminium-Legierung mit definierten Deckschichten als Lagerwerkstoff zur Herstellung von verschleißfesten Gleitlagern

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730367A1 (de) 1987-09-10 1989-03-23 Kabel Metallwerke Ghh Verfahren zur herstellung lochfrassbestaendiger hartgezogener rohre aus kupfer oder kupferlegierungen
DE4110584A1 (de) 1989-10-02 1992-10-08 Akin Okan Verfahren zum kaltverformen und beschichten von metallrohren und mit einer korrosionsschutzschicht versehenes metallrohr

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127092B (de) * 1953-04-13 1962-04-05 Osnabruecker Kupfer Und Draht Verwendung von Kupferlegierungen zur Herstellung von Waschkesseln oder Innenausstattungen von Waschmaschinen
DE1173764B (de) * 1957-05-23 1964-07-09 Siemens Ag Verfahren zur Herstellung abriebfester Oberflaechenschichten grosser Haerte und Leitfaehigkeit, insbesondere fuer elektrische Gleit- und Reibkontakte
GB1157658A (en) * 1966-10-14 1969-07-09 Imp Metal Ind Kynoch Ltd Heat Exchangers
LU80891A1 (fr) * 1979-02-07 1980-09-24 Liege Usines Cuivre Zinc Tubes a usage sanitaire en cuivre phosphoruex ou alliages de cuivre phosphoreux resistant a la corrosion et procede pour leur production
US4500605A (en) * 1983-02-17 1985-02-19 Olin Corporation Electrical component forming process
DE3827353A1 (de) * 1988-08-12 1990-02-22 Kabelmetal Ag Innenoxidierte rohre
DE4213487C1 (de) * 1992-04-24 1993-11-18 Wieland Werke Ag Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730367A1 (de) 1987-09-10 1989-03-23 Kabel Metallwerke Ghh Verfahren zur herstellung lochfrassbestaendiger hartgezogener rohre aus kupfer oder kupferlegierungen
DE4110584A1 (de) 1989-10-02 1992-10-08 Akin Okan Verfahren zum kaltverformen und beschichten von metallrohren und mit einer korrosionsschutzschicht versehenes metallrohr

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TUBE & PIPE TECHNOLOGY, May 1989 (1989-05-01), pages 19 - 21

Also Published As

Publication number Publication date
DE4417455A1 (de) 1995-11-23
DE4417455C2 (de) 1997-09-25
ES2123853T3 (es) 1999-01-16
DE59503577D1 (de) 1998-10-22
EP0683243A3 (fr) 1996-12-04
EP0683243B1 (fr) 1998-09-16

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