EP0566978B1 - Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff - Google Patents

Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff Download PDF

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Publication number
EP0566978B1
EP0566978B1 EP19930106091 EP93106091A EP0566978B1 EP 0566978 B1 EP0566978 B1 EP 0566978B1 EP 19930106091 EP19930106091 EP 19930106091 EP 93106091 A EP93106091 A EP 93106091A EP 0566978 B1 EP0566978 B1 EP 0566978B1
Authority
EP
European Patent Office
Prior art keywords
copper
aluminium
alloy
resistant material
alloy according
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
EP19930106091
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0566978A2 (de
EP0566978A3 (en
Inventor
Wolfgang Dr. Dürrschnabel
Monika Dr. Breu
Gert Dr. Müller
Phan Tan Dr. Tai
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 EP0566978A2 publication Critical patent/EP0566978A2/de
Publication of EP0566978A3 publication Critical patent/EP0566978A3/de
Application granted granted Critical
Publication of EP0566978B1 publication Critical patent/EP0566978B1/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
    • C22C9/01—Alloys based on copper with aluminium as the next major constituent
    • 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 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 Cu-Mg-Al / Si alloy (DE-PS 3,043,833), for example, has also been proposed for the intended use, but this could only partially meet the requirements.
  • JP-A-1 316 431 and JP-A-61 231 131 disclose the use of Cu-Al-Zn-Sn alloys as a material for corrosion-resistant pipes for drinking water.
  • the invention is therefore based on the object of specifying a corrosion-resistant material for which there is no risk of pitting and in which the copper solubility and the mass removal are reduced.
  • the object is achieved in accordance with the invention by using a copper-aluminum-zinc alloy which consists of 0.1-1.0% aluminum; 0.1-1.0% zinc; Silicon, magnesium, iron and niobium as components in a total of up to 1.5%; 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 GB-PS 1,152,481, but there is no indication of the claimed use.
  • a copper alloy with 0.1-0.5% aluminum and 0.1-0.5% zinc is used. It is also advisable to use a copper alloy that additionally contains one or more of the elements silicon, magnesium, iron, niobium up to a maximum content of 1.5%. Copper alloys having the compositions according to claims 4 to 9 are preferably used.
  • Phosphorus improves the pourability and acts as a deoxidizer.
  • Pipes measuring 18 x 1 mm were made of SF-Cu and an alloy according to the invention with the composition according to the following table: material SF-Cu soft, 50 - 70 HB hard, 100 - 120 HB CuAl0.3Zn0.3 soft, 50 - 70 HB hard, 100 - 120 HB
  • the current density-potential curves of the alloy CuAl0.3Zn0.3 and SF-Cu are shown in comparison in FIG. 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 potentials have shifted towards more positive potentials.
  • 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 c compare the polarization conductance of the material CuAl0.3Zn0.3 in different states (soft / hard) with that of SF-Cu. Unalloyed Cu not only exhibits poorer behavior, but also considerable scatter.
  • the mass loss is considerably reduced compared to SF-Cu according to FIG. 3.
  • the copper-aluminum-zinc alloy 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 relating to the invention can thus not only be used in neutral waters. Certain pH fluctuations do not have a negative effect on the corrosion behavior.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
EP19930106091 1992-04-24 1993-04-15 Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff Expired - Lifetime EP0566978B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924213487 DE4213487C1 (de) 1992-04-24 1992-04-24 Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff
DE4213487 1992-04-24

Publications (3)

Publication Number Publication Date
EP0566978A2 EP0566978A2 (de) 1993-10-27
EP0566978A3 EP0566978A3 (en) 1993-12-29
EP0566978B1 true EP0566978B1 (de) 1995-06-28

Family

ID=6457380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930106091 Expired - Lifetime EP0566978B1 (de) 1992-04-24 1993-04-15 Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff

Country Status (5)

Country Link
EP (1) EP0566978B1 (fi)
DE (2) DE4213487C1 (fi)
DK (1) DK0566978T3 (fi)
ES (1) ES2075740T3 (fi)
FI (1) FI102621B1 (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417455C2 (de) * 1994-05-19 1997-09-25 Wieland Werke Ag Verwendung eines korrosionsbeständigen Rohres mit inneren Oxidschichten
DE19606162C2 (de) 1996-02-20 2003-01-30 Wieland Werke Ag Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff
DE102013004081B4 (de) * 2013-03-11 2023-06-07 Hansa Metallwerke Ag Sanitärer Armaturenkörper

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS61231131A (ja) * 1985-04-05 1986-10-15 Kobe Steel Ltd 耐食性銅合金管
JPS61270579A (ja) * 1985-05-27 1986-11-29 古河電気工業株式会社 耐食性給水用銅管
JPH01316431A (ja) * 1988-06-15 1989-12-21 Furukawa Electric Co Ltd:The 耐食性冷媒配管用銅合金管

Also Published As

Publication number Publication date
DE4213487C1 (de) 1993-11-18
ES2075740T3 (es) 1995-10-01
DE59300302D1 (de) 1995-08-03
DK0566978T3 (da) 1995-11-06
FI102621B (fi) 1999-01-15
EP0566978A2 (de) 1993-10-27
FI931829A0 (fi) 1993-04-23
FI931829A (fi) 1993-10-25
FI102621B1 (fi) 1999-01-15
EP0566978A3 (en) 1993-12-29

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