EP1446510B1 - Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable - Google Patents

Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable Download PDF

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Publication number
EP1446510B1
EP1446510B1 EP02803761A EP02803761A EP1446510B1 EP 1446510 B1 EP1446510 B1 EP 1446510B1 EP 02803761 A EP02803761 A EP 02803761A EP 02803761 A EP02803761 A EP 02803761A EP 1446510 B1 EP1446510 B1 EP 1446510B1
Authority
EP
European Patent Office
Prior art keywords
drinking water
copper
zinc
parts
zinc 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
EP02803761A
Other languages
German (de)
English (en)
Other versions
EP1446510A1 (fr
Inventor
Claus Büttner
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.)
Rehau Automotive SE and Co KG
Original Assignee
Rehau AG and Co
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 Rehau AG and Co filed Critical Rehau AG and Co
Publication of EP1446510A1 publication Critical patent/EP1446510A1/fr
Application granted granted Critical
Publication of EP1446510B1 publication Critical patent/EP1446510B1/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
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • 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
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • the invention relates to the use of a corrosion-resistant copper-zinc alloy for drinking water molded parts, in particular for the production of the coupling parts, angle parts, elbow parts, T-piece parts and distributor parts.
  • Copper-zinc alloys with copper contents between 57 and 63% and zinc contents between 36 and 40% are preferred for the production of drinking water molded parts, which are used in all house connection systems if the alloy components and their accompanying elements do not exceed the maximum values of DIN 50930-6. Their machining properties are important for the further and final processing of these materials. By alloying the element lead in weight percentages from 3 to a maximum of 4%, good machinability is achieved, since lead has practically no miscibility with the alloy components copper and zinc and acts as a chip breaker.
  • the materials of the drinking water molded parts for drinking water applications are described in detail in the standards and regulations of DIN 50930-1 to 50930-6 and in DIN EN 806-2 and additionally in the Drinking Water Ordinance (TrinkwV) in the version of the notice from November 2000 named.
  • the parameter values specified in the Drinking Water Ordinance and with regard to the material selection, DIN 50930-6, page 7 and 8 apply to compliance with and falling below the limit values of the material components for drinking water molded parts.
  • EP-A 0 572 959 discloses a copper-zinc alloy for the production of parts for drinking water or sanitary installations, in particular water fittings, which (in% by weight) has the following composition: Cu: 62.5-64%; Pb: 0.5-1.5%; Mn: 0.3-0.4%; Si: 0.5-0.7%; Al: 0.3-0.7%; Sb: 0.05-0.15%; B: 0.0005-0.002%; Fe: 0-0.25%; Ni: 0-0.5% and the rest Zn.
  • alloy components consist of thermally stable dispersoids of Cr 2 Ta, Dy 2 O 3 , Er 2 O 3 , ZrC, WSi 2 , Yb 2 O 3 , Sm 2 O 3 in a total content of 0.1 to 5%, which have a chip-breaking effect and processing advantages. Due to the manufacturing process, dispersoids are replaced as lead replacements in the form of powders during the casting process. With regard to the physiological effect of these rare earth additives on drinking water and the associated stress on infants and adults, long-term studies are currently not available and no dose-dependent, incorporating and toxic effects of dispersoids on the human organism exist so far.
  • the invention is based on the object of providing an improved corrosion-resistant copper-zinc alloy for molded drinking water parts which has corrosion resistance to corrosion processes on the surfaces of the molded drinking water parts and future quality requirements for the drinking water with regard to the limit values of the Entry of copper met.
  • Drinking water molded parts according to the invention are a coupling part, a transition part, an angle part, an elbow part, a T-piece part or a distributor part.
  • the corrosion-resistant copper-zinc alloy according to the invention also offers the advantage that the processability of the copper-zinc alloy is not impaired and the economical production of molded drinking water parts with the commonly available ones Manufacturing methods is made possible.
  • the copper-zinc alloy according to the invention for molded drinking water parts appears physiologically harmless and environmentally friendly. Long-term investigations on drinking water and a pH in the range of 6 to 9.5 showed a significantly reduced corrosion product input and minimal copper ion solubility.
  • the copper solubility values of the copper-zinc alloy according to the invention for molded drinking water parts are below 0.75 mg / l Cu.
  • the advantageously achieved reduction in copper ion solubility in water in the alloy to be used according to the invention is essentially based on the zinc content in the range from 23 to 32%. If the zinc content is below the limit of 23%, processing problems arise and above 32% zinc content the copper ion solubility increases to values greater than 0.8 mg / l Cu.
  • the alloy additions of 0.01 to 0.3% of at least one of the elements tin, iron, nickel, aluminum and / or silicon suppresses the copper ion solubility particularly effectively in the presence of a lead content of 0.7 to 1.5% and improves the corrosion property.
  • Iron and / or tin can be added to the copper-zinc alloy to be used according to the invention up to a maximum of 0.14% in order to increase the corrosion protection.
  • the addition of 0.02% nickel and 0.01% aluminum is particularly favorable. This leads to an advantageous effect of suppressing the copper solubility and shows an improvement in the corrosion property in the presence of 0.005% silicon.
  • the lead content of 0.8 to 1.2% advantageously improves the cutting properties and enables the economical production of molded drinking water parts.
  • composition in percent by weight (% by weight) of copper-zinc alloys tested is given in the table below.
  • the primary material is then produced from the raw material blocks by the extrusion process and the rod and / or tube profiles obtained are subjected to a standardized annealing in a further working step.
  • the structural homogenization of the corrosion-resistant copper-zinc alloy achieved by annealing is preferably carried out at temperatures of 550 to 650 ° C. and for a period of up to 2 hours. After annealing, the bar / tube profiles are subjected to a standardized drawing process and then thermally relaxed.
  • the drinking water molded parts for use as a coupling part are formed by turning or forging with subsequent turning.
  • the drinking water molded parts for use as an angled part, angled bend part and a T-piece part are produced by hot forming and subsequent contour production by rotating processing.
  • the molded drinking water parts are degreased.
  • Test series were carried out on the drinking water molded parts with the corrosion-resistant copper-zinc alloy according to the invention to assess the tendency to corrosion in accordance with the aforementioned DIN standards.
  • the amounts of copper in mg / l are measured with an absorption spectrometer and the pH of the test drinking water used varied in a range from 6 and 9.5.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Domestic Plumbing Installations (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Claims (11)

  1. Utilisation d'un alliage cuivre - zinc résistant à la corrosion pour produire des pièces faconnees destinées au domaine de l'eau potable composés des éléments d'alliage suivants
    a) 23 à 32% de zinc
    b) au moins 0,01 à 0,3% de l'un des éléments étain, fer, nickel, aluminium ou silicium
    c) 0,7 à 1,5% de plomb
    d) reste cuivre y compris impuretés provenant de la fabrication
    en tant que matière pour la fabrication et la part de cuivre restante s'oriente sur la somme des éléments des composants respectifs du mélange de a) à c).
  2. Utilisation d'un alliage cuivre - zinc résistant à la corrosion selon revendication 1, dont la teneur en zinc est de 27 à 30%, pour l'objectif mentionné au revendication 1.
  3. Utilisation d'un alliage cuivre - zinc résistant à la corrosion selon revendication 1 ou 2, qui contient en plus 0,8 à 1,2% de plomb, pour l'objectif mentionné au revendication 1.
  4. Utilisation d'un alliage cuivre - zinc résistant à la corrosion selon revendications 1 à 3, qui contient au moins un élément du groupe
    0,01 à 0,2% d' étain
    0,01 à 0,2% de fer
    0,01 à 0,2% de nickel et/ou d'aluminium
    0,002 à 0,005 de silicium,
    avec la condition que la teneur totale de ces éléments ne dépasse pas 0,25%, pour l'objectif mentionné au revendication 1.
  5. Utilisation d'un alliage cuivre - zinc résistant à la corrosion selon revendication 4, qui contient au moins un élément du groupe
    0,02 à 0,10% d'étain
    0,02 à 0,10% de fer
    0,01 à 0,03% de nickel et/ou d'aluminium
    0,003 à 0,005 de silicium
    et avec une teneur totale de ces éléments allant de 0,053% à 0,235%, pour l'objectif mentionné au revendication 1.
  6. Pièce faconnees destinée au domaine de l' eau potable selon les revendications 1 à 5, caractérisé en ce que c'est une pièce d'accouplement.
  7. Pièce faconnees destinée au domaine de l'eau potable selon les revendications 1 à 5, caractérisé en ce que c'est une pièce de raccordement.
  8. Pièce faconnees destinée au domaine de l'eau potable selon les revendications 1 à 5, caractérisé en ce que c'est une pièce angulaire.
  9. Pièce faconnees destinée au domaine de l' eau potable selon les revendications 1 à 5, caractérisé en ce que c'est une pièce arc.
  10. Pièce faconnees destinée au domaine de l'eau potable selon les revendications 1 à 5, caractérisé en ce que c'est un raccord en T.
  11. Pièce faconnees destinée au domaine de l'eau potable selon les revendications 1 à 5, caractérisé en ce que c'est une pièce de distribution.
EP02803761A 2001-11-27 2002-10-15 Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable Expired - Lifetime EP1446510B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10158130A DE10158130C1 (de) 2001-11-27 2001-11-27 Verwendung einer korrosionsbeständigen Kupfer-Zink-Legierung für Trinkwasserformteile
DE10158130 2001-11-27
PCT/EP2002/011479 WO2003046237A1 (fr) 2001-11-27 2002-10-15 Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces façonnees destinees au domaine de l'eau potable

Publications (2)

Publication Number Publication Date
EP1446510A1 EP1446510A1 (fr) 2004-08-18
EP1446510B1 true EP1446510B1 (fr) 2004-12-29

Family

ID=7707115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02803761A Expired - Lifetime EP1446510B1 (fr) 2001-11-27 2002-10-15 Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable

Country Status (5)

Country Link
EP (1) EP1446510B1 (fr)
AT (1) ATE286151T1 (fr)
AU (1) AU2002365435A1 (fr)
DE (2) DE10158130C1 (fr)
WO (1) WO2003046237A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10301552B3 (de) * 2003-01-16 2004-06-24 Rehau Ag + Co. Korrosionsbeständige Messinglegierung für Trinkwasserformteile
DE202018100075U1 (de) * 2018-01-09 2019-04-10 Otto Fuchs - Kommanditgesellschaft - Kupfer-Zink-Legierung
CN114622111B (zh) * 2020-12-10 2023-01-31 北京有色金属与稀土应用研究所 一种搭铁接线材料及其制备和加工方法
GB2614752B (en) 2022-01-18 2024-07-31 Conex Ipr Ltd Components for drinking water pipes, and method for manufacturing same

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH540342A (de) * 1970-08-20 1973-08-15 Olof Manner Ab Kupfer-Zinklegierung
US4311522A (en) * 1980-04-09 1982-01-19 Amax Inc. Copper alloys with small amounts of manganese and selenium
US5137685B1 (en) * 1991-03-01 1995-09-26 Olin Corp Machinable copper alloys having reduced lead content
JP3399548B2 (ja) * 1991-03-30 2003-04-21 株式会社東洋伸銅所 熱間鍛造用合金
DE4318377C2 (de) * 1992-06-02 1994-04-28 Hetzel & Co Metallhuettenwerk Messinglegierung
ES2099863T3 (es) * 1992-06-02 1997-06-01 Hetzel Metalle Gmbh Aleacion de laton.
US5507885A (en) * 1994-01-17 1996-04-16 Kitz Corporation Copper-based alloy
JP2841270B2 (ja) * 1994-01-17 1998-12-24 株式会社キッツ 耐食性及び熱間加工性に優れた銅基合金並びに該合金を用いたバルブ部品
DE4401997C2 (de) * 1994-01-25 1999-02-25 Okan Dipl Ing Dr Akin Verwendung einer Kupferlegierung für Bauelemente in strömendem Wasser
DE4438485C2 (de) * 1994-10-28 1998-05-20 Wieland Werke Ag Verwendung einer Kupfer-Zink-Legierung für Trinkwasserinstallationen
JP2001064742A (ja) * 1999-06-24 2001-03-13 Chuetsu Metal Works Co Ltd 耐食性、被削性、熱間加工性に優れた黄銅合金

Also Published As

Publication number Publication date
DE10158130C1 (de) 2003-04-24
AU2002365435A1 (en) 2003-06-10
EP1446510A1 (fr) 2004-08-18
ATE286151T1 (de) 2005-01-15
DE50201930D1 (de) 2005-02-03
WO2003046237A9 (fr) 2003-07-24
WO2003046237A1 (fr) 2003-06-05

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