EP0579904B1 - Korrosionsbeständige kupferlegierung - Google Patents

Korrosionsbeständige kupferlegierung Download PDF

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Publication number
EP0579904B1
EP0579904B1 EP19930106094 EP93106094A EP0579904B1 EP 0579904 B1 EP0579904 B1 EP 0579904B1 EP 19930106094 EP19930106094 EP 19930106094 EP 93106094 A EP93106094 A EP 93106094A EP 0579904 B1 EP0579904 B1 EP 0579904B1
Authority
EP
European Patent Office
Prior art keywords
copper
alloy
cover layer
corrosion
copper alloy
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
Application number
EP19930106094
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0579904A1 (de
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/de
Application granted granted Critical
Publication of EP0579904B1 publication Critical patent/EP0579904B1/de
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, pore-free cover layer 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.
  • 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.
  • 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)
EP19930106094 1992-04-24 1993-04-15 Korrosionsbeständige kupferlegierung Expired - Lifetime EP0579904B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924213488 DE4213488C2 (de) 1992-04-24 1992-04-24 Korrosionsbeständige Kupferlegierung
DE4213488 1992-04-24

Publications (2)

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

Family

ID=6457381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930106094 Expired - Lifetime EP0579904B1 (de) 1992-04-24 1993-04-15 Korrosionsbeständige kupferlegierung

Country Status (5)

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

Families Citing this family (5)

* 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
DE4423635A1 (de) * 1994-07-06 1996-01-11 Prym William Gmbh & Co Kg Korrosionsbeständige Kupferlegierung
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

Family Cites Families (4)

* 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
JPS5675541A (en) * 1979-11-22 1981-06-22 Sumitomo Light Metal Ind Ltd Copper alloy for water or hot water supply piping material and heat exchanger tube material
DE3605796A1 (de) * 1985-08-24 1987-03-26 Prym Werke William Korrosionsbestaendiger kupferwerkstoff fuer rohrleitungen, behaeltnisse od. dgl. fuer stroemende medien, insbesondere kalt- und/oder warmwasserrohre
US4749548A (en) * 1985-09-13 1988-06-07 Mitsubishi Kinzoku Kabushiki Kaisha Copper alloy lead material for use in semiconductor device

Also Published As

Publication number Publication date
DE4213488C2 (de) 1995-05-24
FI931830A0 (fi) 1993-04-23
ES2081653T3 (es) 1996-03-16
DE4213488A1 (de) 1993-10-28
FI931830A (fi) 1993-10-25
FI102908B1 (fi) 1999-03-15
DE59300844D1 (de) 1995-12-07
DK0579904T3 (da) 1996-02-05
FI102908B (fi) 1999-03-15
EP0579904A1 (de) 1994-01-26

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