EP0792941A1 - Utilisation d'un alliage cuivre-aluminium-(Zinc) pour un matériau résistant à la corrosion - Google Patents

Utilisation d'un alliage cuivre-aluminium-(Zinc) pour un matériau résistant à la corrosion Download PDF

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Publication number
EP0792941A1
EP0792941A1 EP97102019A EP97102019A EP0792941A1 EP 0792941 A1 EP0792941 A1 EP 0792941A1 EP 97102019 A EP97102019 A EP 97102019A EP 97102019 A EP97102019 A EP 97102019A EP 0792941 A1 EP0792941 A1 EP 0792941A1
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EP
European Patent Office
Prior art keywords
copper
corrosion
zinc
alloy
maximum
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
EP97102019A
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German (de)
English (en)
Other versions
EP0792941B1 (fr
Inventor
Monika Dipl.-Ing. Dr.Rer.Nat. Breu
Gert Dipl.-Ing. Dr.rer.nat. 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
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Publication date
Application filed by Wieland Werke AG filed Critical Wieland Werke AG
Publication of EP0792941A1 publication Critical patent/EP0792941A1/fr
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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
    • C22C9/01—Alloys based on copper with aluminium as the next major constituent

Definitions

  • the invention relates to the use of a copper-aluminum (zinc) alloy as a corrosion-resistant material for pipes in installation and sanitary engineering and in the drinking water sector.
  • a copper-aluminum (zinc) alloy as a corrosion-resistant material for pipes in installation and sanitary engineering and in the drinking water sector.
  • Pipes for the purpose mentioned are widely made from oxygen-free copper (SF-Cu).
  • SF-Cu oxygen-free copper
  • a special manufacturing process can be used to create an oxidic protective layer on the inside of the pipe.
  • An alternative is an alloyed material, in which an oxidic, protective cover layer automatically forms under operating conditions.
  • a copper-magnesium-aluminum / silicon alloy (DE-PS 3,043,833), for example, has also been proposed for the purpose mentioned, but this could only partially meet the requirements.
  • the invention is therefore based on the object of specifying a corrosion-resistant material for which none There is a risk of pitting and in which the copper solubility and the mass removal are reduced.
  • the object is achieved by the use of a copper-aluminum (zinc) alloy, which consists of 1.01 to 8.8% aluminum; optionally up to a maximum of 38% zinc; The rest is copper and usual impurities (the percentages relate to the weight).
  • a copper-aluminum (zinc) alloy which consists of 1.01 to 8.8% aluminum; optionally up to a maximum of 38% zinc; The rest is copper and usual impurities (the percentages relate to the weight).
  • composition of a copper alloy of the type mentioned is known, for example, from DE-OS 2,429,754, but there is no reference to the claimed use.
  • DE-OS 4,423,635 describes an aluminum-zinc-based copper alloy.
  • the compulsory components nickel and / or chromium are prescribed there, which increase the strength but in return also significantly impair the formability.
  • the solubility of chromium in copper is very low. At the specified levels, the solubility limit is exceeded and excretion particles form. With such structural inhomogeneities, which can result in potential differences in the smallest areas, the risk of local corrosion attacks cannot be excluded.
  • a copper alloy with 1.01 to 5% aluminum; optionally up to a maximum of 5% zinc is used.
  • a copper alloy that additionally contains one or more of the elements silicon, tin, niobium in an amount that corresponds at most to that of the respective solubility limit of the mixed crystal.
  • the solubility limit should not be exceeded in order to avoid precipitates, which can be preferred points of attack for corrosion as inhomogeneities. It must be taken into account here that the precipitation behavior can be influenced within certain limits by the corresponding cooling rate, i.e.
  • Copper alloys having the compositions according to claims 3 to 7 are preferably used.
  • Phosphorus improves the pourability and acts as a deoxidizer.
  • FIG. 1 current density-potential curves (FIG. 1) and the electrochemical polarization resistance (R p ) or polarization conductance (R p -1 ) according to FIGS. 2a to d were measured on the tube samples, and the Cu non-conductivity ( Fig. 3) determined.
  • 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. 2a to d compare the polarization conductance of the materials CuAl0.3Zn0.3, CuAl3Zn2 and CuAl5 with that of SF-Cu. Unalloyed Cu not only exhibits poorer behavior, but also considerable scatter.
  • the Cu nonchalance is considerably reduced compared to SF-Cu according to FIG. 3.
  • the Cu-Al (Zn) alloy used according to the invention shows a 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.
  • Al is capable of forming reaction products in acidic media and thus contributing to the formation of an effective protective layer, the same applies to Zn in alkaline media.
  • Both additives stabilize each other and are able to cover a relatively wide pH range together in the Cu-Al-Zn system.
  • the materials to be used according to the invention cannot only be used in neutral waters. Certain pH fluctuations do not have a negative effect on the corrosion behavior.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
EP97102019A 1996-02-20 1997-02-08 Utilisation d'un alliage cuivre-aluminium-(Zinc) pour un matériau résistant à la corrosion Expired - Lifetime EP0792941B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19606162 1996-02-20
DE19606162A DE19606162C2 (de) 1996-02-20 1996-02-20 Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff

Publications (2)

Publication Number Publication Date
EP0792941A1 true EP0792941A1 (fr) 1997-09-03
EP0792941B1 EP0792941B1 (fr) 2000-05-03

Family

ID=7785832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102019A Expired - Lifetime EP0792941B1 (fr) 1996-02-20 1997-02-08 Utilisation d'un alliage cuivre-aluminium-(Zinc) pour un matériau résistant à la corrosion

Country Status (4)

Country Link
EP (1) EP0792941B1 (fr)
DE (2) DE19606162C2 (fr)
DK (1) DK0792941T3 (fr)
ES (1) ES2147950T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534295A (zh) * 2011-11-21 2012-07-04 宁波三旺洁具有限公司 一种耐腐蚀硼铜合金
FR3064280A1 (fr) * 2017-03-23 2018-09-28 Favi - Le Laiton Injecte Alliage a base de cuivre et de zinc pour une utilisation dans l'industrie alimentaire

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029935A1 (fr) * 1997-11-11 2000-08-23 Toto Ltd. Materiau metallique, laiton, et son procede de production
EP3045740B1 (fr) * 2015-01-19 2021-04-21 BTS BauTechnischeSysteme GmbH & Co. KG Élément de fixation destiné à fixer un composant sur un système composite d'isolation thermique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2429754A1 (de) 1974-06-21 1976-01-02 Olin Corp Verfahren zur verbesserung der kriechfestigkeit und der bestaendigkeit gegen spannungsabbau von kupferlegierungen
DE3043833C2 (fr) 1979-11-22 1988-07-14 Sumitomo Light Metal Ind
JPH03229836A (ja) * 1990-02-01 1991-10-11 Kobe Steel Ltd 耐食性銅合金管
JPH03291341A (ja) * 1990-04-06 1991-12-20 Chuetsu Gokin Chuko Kk 耐摩耗性銅合金
DE4213487C1 (de) 1992-04-24 1993-11-18 Wieland Werke Ag Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff
DE4423635A1 (de) 1994-07-06 1996-01-11 Prym William Gmbh & Co Kg Korrosionsbeständige Kupferlegierung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938172A (en) * 1933-03-24 1933-12-05 Chase Companies Inc Copper-base alloys
US2224095A (en) * 1940-02-15 1940-12-03 Scovill Manufacturing Co Tube for heat exchanging apparatus
DE1127092B (de) * 1953-04-13 1962-04-05 Osnabruecker Kupfer Und Draht Verwendung von Kupferlegierungen zur Herstellung von Waschkesseln oder Innenausstattungen von Waschmaschinen
DK99834C (da) * 1962-09-19 1964-09-21 Aktieselkabet Nordiske Kabel T Havvandsbestandig legering af messing eller aluminiummessing egnet for plastisk deformation.
LU81564A1 (fr) * 1979-07-31 1981-03-24 Liege Usines Cuivre Zinc Procede de fabrication de tubes,tubes obtenus par ce procede et leur utilisation dans des condenseurs et des echangeurs de chaleur
DE4324008C2 (de) * 1993-07-17 2003-03-27 Km Europa Metal Ag Verwendung einer korrosionsbeständigen Legierung auf Kupferbasis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2429754A1 (de) 1974-06-21 1976-01-02 Olin Corp Verfahren zur verbesserung der kriechfestigkeit und der bestaendigkeit gegen spannungsabbau von kupferlegierungen
DE3043833C2 (fr) 1979-11-22 1988-07-14 Sumitomo Light Metal Ind
JPH03229836A (ja) * 1990-02-01 1991-10-11 Kobe Steel Ltd 耐食性銅合金管
JPH03291341A (ja) * 1990-04-06 1991-12-20 Chuetsu Gokin Chuko Kk 耐摩耗性銅合金
DE4213487C1 (de) 1992-04-24 1993-11-18 Wieland Werke Ag Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff
DE4423635A1 (de) 1994-07-06 1996-01-11 Prym William Gmbh & Co Kg Korrosionsbeständige Kupferlegierung

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Metals Handbook 9th Edition", 1979, AMERICAN SOCIETY FOR METALS, OHIO, USA, XP002031566 *
DATABASE WPI Section Ch Week 9147, Derwent World Patents Index; Class M26, AN 91-343745, XP002031567 *
DATABASE WPI Section Ch Week 9206, Derwent World Patents Index; Class M26, AN 92-046046, XP002031568 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534295A (zh) * 2011-11-21 2012-07-04 宁波三旺洁具有限公司 一种耐腐蚀硼铜合金
CN102534295B (zh) * 2011-11-21 2016-07-06 宁波三旺洁具有限公司 一种耐腐蚀硼铜合金
FR3064280A1 (fr) * 2017-03-23 2018-09-28 Favi - Le Laiton Injecte Alliage a base de cuivre et de zinc pour une utilisation dans l'industrie alimentaire

Also Published As

Publication number Publication date
DE59701554D1 (de) 2000-06-08
EP0792941B1 (fr) 2000-05-03
DE19606162A1 (de) 1997-08-21
ES2147950T3 (es) 2000-10-01
DK0792941T3 (da) 2000-10-02
DE19606162C2 (de) 2003-01-30

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