EP0683243B1 - Korrosionsbeständiges Rohr mit inneren Oxidschichten - Google Patents
Korrosionsbeständiges Rohr mit inneren Oxidschichten Download PDFInfo
- Publication number
- EP0683243B1 EP0683243B1 EP95107208A EP95107208A EP0683243B1 EP 0683243 B1 EP0683243 B1 EP 0683243B1 EP 95107208 A EP95107208 A EP 95107208A EP 95107208 A EP95107208 A EP 95107208A EP 0683243 B1 EP0683243 B1 EP 0683243B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- corrosion
- annealed
- resistant
- oxide layer
- 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.)
- Expired - Lifetime
Links
Images
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 a copper alloy covered by at least one oxide layer is protected.
- a known method for increasing 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 also sea water used. Depending on the type and amount of alloying elements - usually more concentrated Alloys used - but that is expensive and the Material is inevitably more difficult to form than pure Copper, which also increases production costs.
- the invention is therefore based on the object of a tube to provide a copper alloy, the Copper permeability through the formation of special oxide layers is reduced.
- the object is achieved in that that a copper alloy with 0.01 to 1.0% of an alloyed Elements from the group aluminum, tin, zinc or silicon existing pipe under the inner and outer pipe surface located inner oxide layers, each consist exclusively of the oxide of the alloyed element.
- the process for producing the corrosion-resistant pipes according to the invention is characterized in that the pipe 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, with the formation of mixed oxides avoid and to form only pure oxides, the oxygen partial pressure in the annealing atmosphere must be chosen as low as possible. In any case, the oxygen partial pressure must be lower than the equilibrium pressure of the following reaction: Cu 2 O ⁇ 2 Cu + 1/2 O 2 .
- Annealing in hydrogen, nitrogen, forming gas (90% N 2 , 10% H 2 ) or other gas mixtures is expedient.
- 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. Because the inner oxide layers however a cold deformation of the base material up to one endure a certain degree without damage, the soft pipes then with at least one pull, possibly several trains are further consolidated, so that a tough state results. The inner layers remain in the forming in the material, are therefore in themselves even against mechanical damage and chipping protected. They are even compressed by the forming and thus improved in their protective effect.
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- 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)
Description
Das Basismaterial wird in seiner Zusammensetzung nur gering verändert, wodurch das Umformverhalten bei der Rohrherstellung nicht nennenswert beeinträchtigt wird.
Die gebildete Oxidschicht wird durch mechanische Einwirkung in gewissen Grenzen nicht zerstört, und somit sind eine Verarbeitung mit weiterer Querschnittsreduzierung oder Biegeoperationen unproblematisch.
Es empfiehlt sich insbesondere, die Glühung bei 800 bis 900 °C für 6 bis 12 Stunden durchzuführen.
Claims (8)
- Korrosionsbeständiges Rohr aus einer Kupferlegierung, das durch mindestens eine Oxidschicht geschützt ist,
dadurch gekennzeichnet,
daß das aus einer Kupferlegierung mit 0,01 bis 1,0 % eines zulegierten Elements aus der Gruppe Aluminium, Zinn, Zink oder Silizium bestehende Rohr unter der inneren und äußeren Rohroberfläche befindliche, innere Oxidschichten aufweist, die jeweils ausschließlich aus dem Oxid des zulegierten Elements bestehen. - Korrosionsbeständiges Rohr nach Anspruch 1,
dadurch gekennzeichnet,
daß die Dicke der inneren Oxidschichten D = 2 bis 20 µm beträgt. - Korrosionsbeständiges Rohr nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß es im weichgeglühten Zustand vorliegt. - Korrosionsbeständiges Rohr nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß es im ziehharten Zustand vorliegt. - Verfahren zur Herstellung eines korrosionsbeständigen Rohres nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß das Rohr vor oder an Endabmessung bei Glühtemperaturen oberhalb von 600 °C für mindestens eine Stunde in einer Gasatmosphäre mit einem Sauerstoffpartialdruck geglüht wird, der geringer ist als der Gleichgewichtsdruck der Reaktion CU2O ⇄ 2 Cu + 1/2 O2. - Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
daß das Rohr in Wasserstoff, Stickstoff oder Formiergas geglüht wird. - Verfahren nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß das Rohr bei 800 bis 900 °C geglüht wird. - Verfahren nach einem oder mehreren der Ansprüche 5 bis 7,
dadurch gekennzeichnet,
daß das Rohr für 6 bis 12 Stunden geglüht wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4417455A DE4417455C2 (de) | 1994-05-19 | 1994-05-19 | Verwendung eines korrosionsbeständigen Rohres mit inneren Oxidschichten |
DE4417455 | 1994-05-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0683243A2 EP0683243A2 (de) | 1995-11-22 |
EP0683243A3 EP0683243A3 (de) | 1996-12-04 |
EP0683243B1 true EP0683243B1 (de) | 1998-09-16 |
Family
ID=6518417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95107208A Expired - Lifetime EP0683243B1 (de) | 1994-05-19 | 1995-05-12 | Korrosionsbeständiges Rohr mit inneren Oxidschichten |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0683243B1 (de) |
DE (2) | DE4417455C2 (de) |
ES (1) | ES2123853T3 (de) |
Families Citing this family (1)
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 |
Family Cites Families (9)
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 |
DE3730367C2 (de) | 1987-09-10 | 1997-10-09 | Km Europa Metal Ag | Verfahren zur Herstellung lochfraßbeständiger hartgezogener Rohre aus Kupfer oder Kupferlegierungen |
DE3827353A1 (de) * | 1988-08-12 | 1990-02-22 | Kabelmetal Ag | Innenoxidierte rohre |
DE3932865A1 (de) | 1989-10-02 | 1991-04-11 | Akin Okan | Gegen korrosion geschuetztes metallrohr |
DE4213487C1 (de) * | 1992-04-24 | 1993-11-18 | Wieland Werke Ag | Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff |
-
1994
- 1994-05-19 DE DE4417455A patent/DE4417455C2/de not_active Expired - Fee Related
-
1995
- 1995-05-12 EP EP95107208A patent/EP0683243B1/de not_active Expired - Lifetime
- 1995-05-12 ES ES95107208T patent/ES2123853T3/es not_active Expired - Lifetime
- 1995-05-12 DE DE59503577T patent/DE59503577D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0683243A3 (de) | 1996-12-04 |
DE59503577D1 (de) | 1998-10-22 |
DE4417455C2 (de) | 1997-09-25 |
EP0683243A2 (de) | 1995-11-22 |
ES2123853T3 (es) | 1999-01-16 |
DE4417455A1 (de) | 1995-11-23 |
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