EP1439238B1 - Alliage de laiton résistant à la corrosion pour pièces en contact avec l'eau potable - Google Patents

Alliage de laiton résistant à la corrosion pour pièces en contact avec l'eau potable Download PDF

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Publication number
EP1439238B1
EP1439238B1 EP04000423A EP04000423A EP1439238B1 EP 1439238 B1 EP1439238 B1 EP 1439238B1 EP 04000423 A EP04000423 A EP 04000423A EP 04000423 A EP04000423 A EP 04000423A EP 1439238 B1 EP1439238 B1 EP 1439238B1
Authority
EP
European Patent Office
Prior art keywords
drinking water
brass alloy
corrosion
brass
moldings
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
EP04000423A
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German (de)
English (en)
Other versions
EP1439238A1 (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
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Filing date
Publication date
Application filed by Rehau AG and Co filed Critical Rehau AG and Co
Publication of EP1439238A1 publication Critical patent/EP1439238A1/fr
Application granted granted Critical
Publication of EP1439238B1 publication Critical patent/EP1439238B1/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
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • the invention relates to a corrosion-resistant brass alloy for drinking water moldings for use in drinking water and / or sanitary installations.
  • brass alloys with different copper contents of between 57 and 63% and zinc contents between 36 and 40% are used, which are used in domestic connection systems for drinking water or sanitary installations.
  • the addition of certain alloying constituents gives brass alloys whose properties are adjusted in different ways by these alloying constituents.
  • DIN 50930-6 determines the limits of brass alloys used today for drinking water or sanitary installations and currently defines the maximum values of the alloying components in question and their accompanying elements. It is known that alloying the element lead in weight percentages from 3 to a maximum of 4% improves the machinability.
  • Corrosion-resistant brass alloys with an alloy composition according to DIN EN 12163 to 12168, group D for drinking-water molded parts are known from the prior art, which in addition to the dezincification resistance, have good cutting and cold forming properties. These are brass alloys with 61 to 63% copper, 32.9 to 37% zinc, 1.7 to 2.8% lead, and 0.02 to 0.15% arsenic and residual alloying shares such as aluminum, Manganese and tin, each accounting for up to 0.1% by weight.
  • alloying ingredients such as those in DE 44 38 485 C2 and EP 0 506 995 A1 consist of thermally stable dispersoids such as Cr 2 Ta, Dy 2 O 3 , Er 2 O 3 , ZrC, WSi 2 , Yb 2 O 3 , Sm 2 O 3 in the total content of 0.1 to 5%, which is a chipbreaking
  • dispersoids such as Cr 2 Ta, Dy 2 O 3 , Er 2 O 3 , ZrC, WSi 2 , Yb 2 O 3 , Sm 2 O 3 in the total content of 0.1 to 5%
  • the invention is based, starting from the prior art, the object to provide an improved corrosion-resistant brass alloy for drinking water moldings available that has corrosion resistance to corrosion processes on the water-bearing surfaces of the drinking water moldings and future quality requirements for drinking water with respect to the limits of entry of corrosion products Fulfills.
  • This object is achieved by the use of a brass alloy with the composition mentioned in claim 1.
  • advantageous embodiments of the brass alloy used in the invention are given.
  • the brass alloy used according to the invention according to claim 1 is resistant to corrosion and has with respect to the crystalline and intergranular stress corrosion cracking and - even planar - Entzinkungsbe pretechnik no and with regard to Loch- / Muldenfrives on the water-bearing inner surfaces of drinking water moldings only smallest / isolated corrosion attack.
  • the copper content was varied within a range of 60 to 69%.
  • arsenic and simultaneous reduction of the iron content / content the corrosion resistance under the condition that the ratio of iron and arsenic within the limits specified in claim 1 according to the invention has been improved.
  • Another advantage of the invention is that under practical test conditions, compared to the known brass alloys, no selective corrosion could be determined experimentally in drinking water moldings consisting of the brass alloy according to the invention.
  • the corrosion characteristics of the brass alloy according to the invention are thus consistently more advantageous than previously known from the prior art and used brass alloys for use in drinking water or sanitary installations.
  • brass rods are made of brass alloy and drinking water moldings, such as coupling, angle, elbow, T-piece, distributor parts and fittings, manufactured with known and customary manufacturing and processing methods.
  • dezincification depth Hole / trough depth of cut Intercrystalline or crystalline corrosion or stress corrosion cracking depth 1 10-263 16-40 6-34, in places to 53 2 8-22 15-53 none 3 none isolated ⁇ 9 none 4 none isolated ⁇ 6 none 5 8-12 up to 32 9-31
  • Fig. 1 shows by way of example the drinking water moldings used in the test series, referred to below as fittings, consisting of the brass alloy used in accordance with the invention.
  • Fig. 2 shows in 200x magnification a microscope image of a fitting, consisting of a known brass alloy (CW602N), on the water-bearing inner surface, after 3 months of testing in different waters / drinking waters with different pH values and temperature load in the range of 5 to 20 ° C. ,
  • CW602N known brass alloy
  • Fig. 3 shows in 400-fold magnification a micrograph of a fitting made from the brass alloy used according to the invention fitting on a water-bearing inner surface after 3 months of testing in different waters / drinking waters with different pH values and temperature in the range of 5 to 20 ° C. It can be seen that only occasional hole / trough (marked A) occurs, which is significantly lower than in comparison to known brass alloys tested (see Fig. 2 ) and not spatially distributed.
  • Fig. 4 shows a microscope photograph of the inside surface of a fitting, prepared by a known dezincification resistant brass alloy (CW 602N) and after the ammonia test (DIN 50916). Significantly, this indicates progressive grain breakup (marked C) along the surface at a depth of up to 65 ⁇ m.
  • Fig. 5a, b show microscope images on the inside surface of a fitting, prepared according to the brass alloy used in the invention and after the ammonia test (DIN 50916).
  • Fig. 4 shows the use of the brass alloy according to claim 1 only minor corrosion attack and the first grain layer is still obtained as a whole, ie an intercrystalline and / or crystalline corrosion, especially stress corrosion cracking does not occur and a grain disintegration, as in Fig. 4 (C marked) is not recognizable.
  • Fig. 6 shows a 600-fold magnified microscope image of a known brass alloy after testing for Entzinkungsbe pretechnik according to ISO 6509. A corrosive attack of 3 grain layers and more is clearly recognizable, corresponding to a Entzinkungstiefe of up to 93 microns.
  • Fig. 7 shows a 600-fold magnified microscope image of the brass alloy used in the invention and tested for Entzinkungsbe pretechnik according to ISO 6509. Compared to Fig. 6 no dezincification was detected / observed along the inner surface.
  • the brass alloy used in the invention shows overall, compared to known brass alloys (s. Fig. 2 . 4 and 6 ), a significantly reduced corrosion attack, in particular no crystalline and / or intergranular corrosion / stress corrosion cracking and only partially occurring hole / Muldenfrrust on the water-bearing inside of drinking water moldings produced therefrom.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Domestic Plumbing Installations (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Laminated Bodies (AREA)
  • Table Devices Or Equipment (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Contacts (AREA)

Claims (2)

  1. Utilisation d'un alliage de laiton pour la fabrication de pièces moulées résistant à la corrosion en contact avec l'eau potable, caractérisée par la composition suivante (en % en poids) :
    63,1 % de cuivre
    1,1 % de plomb
    0,01 % de fer
    0, 1 % de manganèse
    0,1 % de nickel
    0,001 % de silicium
    0,001 % de chrome
    0,001 % d'aluminium
    0,06 % d'arsenic
    0,04 % de bismuth
    0,001 % de phosphore
    0,05 % d'antimoine
    0,001 % de soufre
    0,001 % de tellure
    0,001 % de cadmium
    0,001 % de sélénium
    0,001 % d'argent
    0,05 % d'étain
    et en tant que proportion résiduelle au total 0,01 % de béryllium, de bore, de cobalt, de magnésium, de titane, de zirconium et de zinc.
  2. Utilisation d'un alliage de laiton selon la revendication 1, pour la fabrication de pièces moulées, en particulier de pièces d'accouplement, de pièces coudées, de pièces d'angle courbes, de pièces en forme de T, de pièces de distribution et de raccords.
EP04000423A 2003-01-16 2004-01-12 Alliage de laiton résistant à la corrosion pour pièces en contact avec l'eau potable Expired - Lifetime EP1439238B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10301552 2003-01-16
DE10301552A DE10301552B3 (de) 2003-01-16 2003-01-16 Korrosionsbeständige Messinglegierung für Trinkwasserformteile

Publications (2)

Publication Number Publication Date
EP1439238A1 EP1439238A1 (fr) 2004-07-21
EP1439238B1 true EP1439238B1 (fr) 2011-04-13

Family

ID=32336637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04000423A Expired - Lifetime EP1439238B1 (fr) 2003-01-16 2004-01-12 Alliage de laiton résistant à la corrosion pour pièces en contact avec l'eau potable

Country Status (3)

Country Link
EP (1) EP1439238B1 (fr)
AT (1) ATE505566T1 (fr)
DE (2) DE10301552B3 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2547566T3 (es) * 2006-05-24 2015-10-07 Atotech Deutschland Gmbh Compuesto de recubrimiento metálico y método para la deposición de cobre, zinc y estaño adecuado para la producción de una célula solar de película fina
CN101215654B (zh) * 2008-01-04 2010-10-06 宁波博威合金材料股份有限公司 高强度黄铜合金
CN102477498A (zh) * 2010-11-26 2012-05-30 摩登岛股份有限公司 易切削的环保黄铜合金
CN102560190B (zh) * 2012-01-30 2013-09-18 九星控股集团有限公司 一种高锌无铅黄铜合金及制备方法
CN103509967B (zh) * 2013-01-22 2016-04-27 阮媛清 一种重力铸造专用dzr环保黄铜合金锭及其制作工艺
DE102013003817A1 (de) * 2013-03-07 2014-09-11 Grohe Ag Kupfer-Zink-Legierung für eine Sanitärarmatur sowie Verfahren zu deren Herstellung
DE102013004081B4 (de) * 2013-03-11 2023-06-07 Hansa Metallwerke Ag Sanitärer Armaturenkörper
CN104087782A (zh) * 2013-04-01 2014-10-08 浙江艾迪西流体控制股份有限公司 一种低铅黄铜合金及其制备方法
CN104087781B (zh) * 2013-04-01 2016-12-28 台州艾迪西投资有限公司 一种无铋低铅黄铜合金及其制备方法
CN103469004B (zh) * 2013-08-14 2015-12-02 永和流体智控股份有限公司 一种无铅铜合金材料
CN104722901A (zh) * 2013-12-24 2015-06-24 财团法人金属工业研究发展中心 无铅黄铜的焊接方法
CN103725919B (zh) * 2014-01-03 2016-09-14 安新县华昌合金厂 一种无铅黄铜合金
CN105400987A (zh) * 2015-11-10 2016-03-16 太仓捷公精密金属材料有限公司 一种铜合金材料
CN106011532B (zh) * 2016-06-30 2018-05-22 宁波金田铜业(集团)股份有限公司 饮用水输配专用环保黄铜合金及其制备方法
CN110117736B (zh) * 2019-06-17 2021-11-19 上海理工大学 一种塑性好耐腐蚀的铋黄铜合金
CN111101017B (zh) * 2019-12-31 2021-04-27 黑龙江北鸥卫浴用品有限公司 耐腐蚀低铅黄铜合金、黄铜铸件及其制备方法
DE102020128955A1 (de) 2020-11-03 2022-05-05 Aurubis Stolberg Gmbh & Co. Kg Messinglegierung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3399548B2 (ja) * 1991-03-30 2003-04-21 株式会社東洋伸銅所 熱間鍛造用合金
US5507885A (en) * 1994-01-17 1996-04-16 Kitz Corporation Copper-based alloy
DE4438485C2 (de) * 1994-10-28 1998-05-20 Wieland Werke Ag Verwendung einer Kupfer-Zink-Legierung für Trinkwasserinstallationen
DE19722827A1 (de) * 1997-05-30 1998-12-03 Diehl Stiftung & Co Verwendung einer Messinglegierung für Sanitärrohre
DE10132055C2 (de) * 2001-07-05 2003-12-11 Diehl Metall Stiftung & Co Kg Entzinkungsbeständige Kupfer-Zink-Legierung sowie Verfahren zu ihrer Herstellung
DE10158130C1 (de) * 2001-11-27 2003-04-24 Rehau Ag & Co Verwendung einer korrosionsbeständigen Kupfer-Zink-Legierung für Trinkwasserformteile

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Publication number Publication date
DE10301552B3 (de) 2004-06-24
DE502004012390D1 (de) 2011-05-26
ATE505566T1 (de) 2011-04-15
EP1439238A1 (fr) 2004-07-21

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