EP0579904A1 - Alliage de cuivre résistant à la corrosion - Google Patents

Alliage de cuivre résistant à la corrosion Download PDF

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Publication number
EP0579904A1
EP0579904A1 EP93106094A EP93106094A EP0579904A1 EP 0579904 A1 EP0579904 A1 EP 0579904A1 EP 93106094 A EP93106094 A EP 93106094A EP 93106094 A EP93106094 A EP 93106094A EP 0579904 A1 EP0579904 A1 EP 0579904A1
Authority
EP
European Patent Office
Prior art keywords
corrosion
copper alloy
elements
positive ions
resistant copper
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
EP93106094A
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German (de)
English (en)
Other versions
EP0579904B1 (fr
Inventor
Wolfgang Dr. Dürrschnabel
Monika Dr. Breu
Gert Dr. Müller
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 EP0579904A1 publication Critical patent/EP0579904A1/fr
Application granted granted Critical
Publication of EP0579904B1 publication Critical patent/EP0579904B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper

Definitions

  • the invention relates to a corrosion-resistant copper alloy which consists of copper and at least two alloy elements which are less noble than copper in their electrochemical voltage potential and which together with copper form a firmly adhering, non-porous cover layer made of oxides, oxide hydrates and / or hydroxides, the amount of each Elements lies within the limits within which the alloy lies in the mixed crystal range under technical cooling conditions.
  • Such an alloy is known for example from DE-OS 3,605,796.
  • DE-OS 3,605,796 because of the high concentrations of the additional elements, there is a risk of excretion and thus of additional processing difficulties.
  • the majority of corrosion damage in copper water pipes is caused by even surface corrosion or pitting. Improper installation can also lead to corrosion attacks in the area of solder joints and connections.
  • the corrosion resistance of copper can in principle be increased by producing a firmly adhering, coherent oxide cover layer. This is applied to the inner surface of the pipe using special manufacturing processes, but this is technically complicated and labor-intensive.
  • the more advanced method is to use alloy additives to form a material that, when used, automatically forms an improved oxide coating.
  • the invention is based on the object of specifying a corrosion-resistant material which is characterized in particular by an improved covering layer formation compared to oxygen-free copper and by reduced copper solubility and for which there is no risk of pitting.
  • the mass loss should be reduced.
  • the copper alloy contains at least 99.0% by weight of copper, the melting point of the mixed crystal is above 400 ° C., at least two alloy elements of unequal valence form thermodynamically stable chemical compounds of the types mentioned in the top layer Form that the two alloy elements together assume an average valence between 2.5 and 3.0, the difference between the valences being a maximum of 3.
  • Average valence should be understood to mean the arithmetic mean of the valences of the two alloy elements.
  • Claims 2 to 4 relate to preferred embodiments of the invention: Thereafter, at least one element forms thermodynamically stable chemical compounds of oxides, oxide hydrates and / or hydroxides in the form of divalent positive ions in the cover layer, and at least one further element forms thermodynamically stable chemical compounds of the type mentioned in the form of trivalent positive ions in the cover layer, or that Another element forms thermodynamically stable chemical compounds of the types mentioned in the form of tetravalent positive ions in the cover layer, or at least one element forms thermodynamically stable chemical compounds of the types mentioned in the form of monovalent positive ions in the cover layer, and at least one further element forms in the cover layer thermodynamically stable chemical compounds of the types mentioned in the form of tetravalent positive ions.
  • the elements lithium, sodium, potassium, rubidium or cesium are selected from the group of monovalent positive ions; from the group of divalent positive ions, the elements zinc, cadmium, beryllium, magnesium, calcium, strontium, barium, manganese, iron, cobalt or nickel; from the group of the trivalent ions boron, aluminum, gallium, indium, scandium, yttrium, lanthanum, cerium, mixed metal, chromium, iron or cobalt and from the group of the tetravalent ions silicon, germanium, tin, titanium, zircon or hafnium.
  • Phosphorus improves the pourability and acts as a deoxidizer.
  • the elements mentioned are added in an amount of at least 0.1% by weight.
  • the alloy according to the invention is preferably used as a material for pipes in installation and sanitary technology and for drinking water pipes.
  • Tubes measuring 18 x 1 mm were made of oxygen-free copper and three comparative alloys of the following composition.
  • Fig. 1 the current density-potential curves of the alloys CuMg0.7Ti0.2, CuAl0.5Zn0.5, CuLi0.6Si0.1 and SF-Cu are shown in comparison. It can be seen that the alloyed elements significantly expand the range of corrosion resistance. The passive current density is reduced compared to SF-Cu, which speaks for the better cover layer quality. The breakthrough potential has shifted towards more positive values.
  • the polarization resistance R p or the reciprocal, the polarization conductance R p ⁇ 1 is a measure of the rate of corrosion. The lower the polarization conductance, the greater the resistance to uniform corrosion.
  • Figures 2a to g compare the polarization conductance of the materials CuMg0.7Ti0.2, CuAl0.5, Zn0.5 and CuLi0.6Si0.1 in different states (soft / hard) with that of SF-Cu. Unalloyed Cu not only exhibits poorer behavior, but also considerable scatter.
  • the alloys according to the invention show significantly better behavior than SF-Cu. Not only is the quality of the covering layer improved, but also the rate of formation is influenced and, above all, the potential range of corrosion resistance is expanded. This formation of the passive layer significantly reduces the Cu solubility.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Laminated Bodies (AREA)
  • Powder Metallurgy (AREA)
EP93106094A 1992-04-24 1993-04-15 Alliage de cuivre résistant à la corrosion Expired - Lifetime EP0579904B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4213488 1992-04-24
DE4213488A DE4213488C2 (de) 1992-04-24 1992-04-24 Korrosionsbeständige Kupferlegierung

Publications (2)

Publication Number Publication Date
EP0579904A1 true EP0579904A1 (fr) 1994-01-26
EP0579904B1 EP0579904B1 (fr) 1995-11-02

Family

ID=6457381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106094A Expired - Lifetime EP0579904B1 (fr) 1992-04-24 1993-04-15 Alliage de cuivre résistant à la corrosion

Country Status (5)

Country Link
EP (1) EP0579904B1 (fr)
DE (2) DE4213488C2 (fr)
DK (1) DK0579904T3 (fr)
ES (1) ES2081653T3 (fr)
FI (1) FI102908B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695810A1 (fr) * 1994-07-06 1996-02-07 William Prym GmbH & Co. KG Allaige de cuire, résistant à la corrosion

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4401997C2 (de) * 1994-01-25 1999-02-25 Okan Dipl Ing Dr Akin Verwendung einer Kupferlegierung für Bauelemente in strömendem Wasser
DE29916516U1 (de) 1999-09-20 2000-04-20 Reif, Peter, 87600 Kaufbeuren Wasserhahn mit integriertem Seifenspender
DE102007015442B4 (de) 2007-03-30 2012-05-10 Wieland-Werke Ag Verwendung einer korrosionsbeständigen Kupferlegierung
DE102011016318A1 (de) * 2011-04-07 2012-10-11 Wieland-Werke Ag Hartphasenhaltige Kupfer-Zinn-Mehrstoffbronze, Herstellungsverfahren und Verwendung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2065166A (en) * 1979-11-22 1981-06-24 Sumitomo Light Metal Ind Copper-base-alloy tube for carrying potable water and for a heat exchanger
EP0238859A2 (fr) * 1986-02-22 1987-09-30 William Prym GmbH & Co. KG Matériau à base de cuivre, résistant à la corrosion et utilisable pour tuyauteries, réservoirs et accessoires pour fluides en circulation, en particulier pour tuyauteries pour eau chaude et/ou froide
US4872048A (en) * 1985-09-13 1989-10-03 Mitsubishi Kinzoku Kabushiki Kaisha Semiconductor device having copper alloy leads

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047978A (en) * 1975-04-17 1977-09-13 Olin Corporation Processing copper base alloys

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2065166A (en) * 1979-11-22 1981-06-24 Sumitomo Light Metal Ind Copper-base-alloy tube for carrying potable water and for a heat exchanger
US4872048A (en) * 1985-09-13 1989-10-03 Mitsubishi Kinzoku Kabushiki Kaisha Semiconductor device having copper alloy leads
EP0238859A2 (fr) * 1986-02-22 1987-09-30 William Prym GmbH & Co. KG Matériau à base de cuivre, résistant à la corrosion et utilisable pour tuyauteries, réservoirs et accessoires pour fluides en circulation, en particulier pour tuyauteries pour eau chaude et/ou froide

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Week 8229, Derwent Publications Ltd., London, GB; AN 82-60405E & JP-A-57 094 539 (FURUKAWA ELECTRIC CO) 12. Juni 1982 *
Week 8608, Derwent Publications Ltd., London, GB; AN 86-051352 & JP-A-61 003 876 (NIPPON MINING KK) 9. Januar 1986 *
Week 8648, Derwent Publications Ltd., London, GB; AN 86-314306 & JP-A-61 231 131 (KOBE STEEL KK) 15. Oktober 1986 *
Week 9006, Derwent Publications Ltd., London, GB; AN 90-040228 & JP-A-1 316 431 (FURUKAWA ELECTRIC CO) 21. Dezember 1989 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695810A1 (fr) * 1994-07-06 1996-02-07 William Prym GmbH & Co. KG Allaige de cuire, résistant à la corrosion

Also Published As

Publication number Publication date
EP0579904B1 (fr) 1995-11-02
DE4213488C2 (de) 1995-05-24
FI931830A7 (fi) 1993-10-25
FI102908B1 (fi) 1999-03-15
DE59300844D1 (de) 1995-12-07
DE4213488A1 (de) 1993-10-28
FI102908B (fi) 1999-03-15
DK0579904T3 (da) 1996-02-05
FI931830A0 (fi) 1993-04-23
ES2081653T3 (es) 1996-03-16

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