EP0238859B1 - Matériau à base de cuivre, résistant à la corrosion et utilisable pour tuyauteries, réservoirs et accessoires pour fluides en circulation, en particulier pour tuyauteries pour eau chaude et/ou froide - Google Patents
Matériau à base de cuivre, résistant à la corrosion et utilisable pour tuyauteries, réservoirs et accessoires pour fluides en circulation, en particulier pour tuyauteries pour eau chaude et/ou froide Download PDFInfo
- Publication number
- EP0238859B1 EP0238859B1 EP87102491A EP87102491A EP0238859B1 EP 0238859 B1 EP0238859 B1 EP 0238859B1 EP 87102491 A EP87102491 A EP 87102491A EP 87102491 A EP87102491 A EP 87102491A EP 0238859 B1 EP0238859 B1 EP 0238859B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- copper
- corrosion
- cold
- phosphorus
- 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
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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
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
Definitions
- the invention is directed to copper materials of the type specified in the preamble of claim 1.
- the damage cases caused by corrosion on cold and hot water pipes have increased considerably in recent times. These damage cases can be observed particularly in the case of installation pipes for the heating and sanitary area. More than a third of the damage occurs about four to five years after commissioning. Even after this short operating time, there are high repair and, above all, additional follow-up costs if such installation pipes were installed under plaster or in masonry.
- Corrosion on pipelines can be divided into five groups, namely uniform surface corrosion, pitting or trough corrosion, selective corrosion attack (for copper-zinc alloys) and stress corrosion cracking.
- contact corrosion can occur in critical areas such as changes in cross-section or pipe bends.
- the invention has for its object to develop a copper material of the type mentioned in the preamble of claim 1, which has a reduced sensitivity to pitting and stress corrosion cracking and is characterized by an increased cavitation resistance.
- This is achieved according to the invention by adding the alloy constituents to the copper mentioned in the characterizing part of claim 1.
- the desired effects are optimized if an alloy content of these constituents according to claim 2 is added to the copper.
- the components in the various mixture components are selected within these limits. For example, the addition of phosphorus in the mixture component (c) is only used in areas in which cold deformation of the copper alloy can be avoided, as stated in claim 3. Otherwise, only phosphorus-free copper alloys are used.
- the electrode potentials are plotted against p H values for the metals, metal oxides and ions mentioned.
- the diagrams contain the chemical and electrochemical equilibrium curves of the respective metal / solution system and delimit the conditions under which immunity, ie no attack by the metals, corrosion or passivity, can be expected. Each curve represents a reaction in equilibrium.
- a horizontal line corresponds to an equilibrium state in which electrons, but no H+ or OH ⁇ ions are contained.
- a vertical line corresponds to an equilibrium state in which H+ or OH ⁇ ions are present, but no electrons.
- an inclined line corresponds to an equilibrium state in which both H+ and OH+ ions and electrons are contained.
- the diagrams contain areas in which the metals dissolve as ions and areas in which the metals are present as a condensed phase either as pure metal or as metal oxide.
- the elements made from the components titanium / niobium, nickel / chromium and aluminum / silicon have proven to be suitable additional elements for increasing the corrosion resistance, especially by shifting the resting potential to positive values.
- the component germanium / gallium does not form soluble oxides in aqueous solutions, but in a wide range ions that dissolve instead of copper at certain electrochemical potentials.
- Such alloy components can be referred to as "sacrificial elements". This results in a cementation effect in the copper.
- the mixture component aluminum / silicon is added according to the invention as an alloy component.
- the effects of these can be supported by adding arsenic / phosphorus. This is also important because arsenic and phosphorus support the passivating influence of nickel, titanium, niobium and aluminum. The latter form water-insoluble oxides in a wide range. The oxides support the formation of a protective cover layer. As already mentioned, germanium and gallium serve as sacrificial elements. If the copper alloy according to the invention is not subject to cold working when processed, phosphorus can be used as an additive. Otherwise, a phosphorus-free copper alloy is only formed with arsenic additives.
- the alloying constituents are added proportionally to the copper alloys, taking into account the chemical potential and the change in the lattice parameter of copper, in such a way that mixed crystal formation takes place and multiphase in the crystal configuration Absence of an electrolyte does not lead to electrochemical reaction or pitting corrosion.
- 6 shows the lattice constants of various copper mixed crystals with different alloy contents of the metal in the copper. Apart from nickel, the lattice constant increases more or less as the metal dissolves in copper, depending on the element.
- FIG. 7 and 8 show state diagrams for various copper mixed crystals, specifically in FIG. 7 the two-substance system copper-niobium over the entire mixing range between pure niobium and pure copper as a function of the temperature of the mixed crystal, while FIG. 8 shows the corresponding ratios represents the copper-titanium two-component system.
- the addition of nickel favors the expansion of the mixed crystal area in the copper alloy according to the invention. This allows larger amounts of alloying elements to be added.
- the aim is an alloy with the highest possible content of alloy elements, the end product forming a copper mixed crystal from an alloy that is as single-phase as possible.
- a good composition of the copper alloy according to the invention results from the components mentioned in claim 1, while an optimal corrosion resistance, which is also particularly economical to produce, results from the compositions mentioned in claim 2.
- the limit values of the individual alloy components for each component of the mixture, such as aluminum / silicon, each in percent by weight are indicated mean that the sum of the proportions of both elements is in this range, and in extreme cases one or the other element may be missing in this component.
- the properties of the copper alloy according to the invention show that the hot and cold formability is quite comparable to that of conventional rollable copper alloys. As already mentioned, the corrosion resistance of the alloy according to the invention is significantly improved. It should only be noted in the case of the copper alloy according to the invention that during the manufacturing process, slow cooling is brought about after the heat treatment of the mixture, so that no precipitates occur in the mixed crystal, which cause hardening and thus solidification in the material. This often has an adverse effect on the further processing of the material.
- the copper alloy according to the invention can be used with particularly good results for installation pipes in heating and sanitary systems.
- the copper alloy is also successfully used in industrial pipes and other pipe systems such as in motor vehicles.
- the copper alloy can also be used to build hot water preparation devices, containers, boilers, coolers and heat exchangers.
- application in seawater desalination plants is conceivable.
- this material can also be used for the construction of pipes and containers which have to absorb other flowing media than water or water vapor.
Landscapes
- 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)
- Rigid Pipes And Flexible Pipes (AREA)
- Prevention Of Electric Corrosion (AREA)
Claims (3)
des constituants d'alliage sont ajoutés au cuivre dans les pourcentages en poids suivants par rapport au total du mélange :
en ce qui concerne le composant de mélange (c), l'alliage est exempt de phosphore et ne contient que de l'arsenic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87102491T ATE66496T1 (de) | 1986-02-22 | 1987-02-21 | Korrosionsbestaendiger kupferwerkstoff fuer rohrleitungen, behaeltnisse od. dgl. fuer stroemende medien, insbesondere kalt- und/oder warmwasserrohre. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863605796 DE3605796A1 (de) | 1985-08-24 | 1986-02-22 | Korrosionsbestaendiger kupferwerkstoff fuer rohrleitungen, behaeltnisse od. dgl. fuer stroemende medien, insbesondere kalt- und/oder warmwasserrohre |
DE3605796 | 1986-02-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0238859A2 EP0238859A2 (fr) | 1987-09-30 |
EP0238859A3 EP0238859A3 (en) | 1989-06-07 |
EP0238859B1 true EP0238859B1 (fr) | 1991-08-21 |
Family
ID=6294752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87102491A Expired - Lifetime EP0238859B1 (fr) | 1986-02-22 | 1987-02-21 | Matériau à base de cuivre, résistant à la corrosion et utilisable pour tuyauteries, réservoirs et accessoires pour fluides en circulation, en particulier pour tuyauteries pour eau chaude et/ou froide |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0238859B1 (fr) |
AT (1) | ATE66496T1 (fr) |
DE (2) | DE3605796A1 (fr) |
ES (1) | ES2023831B3 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT392176B (de) * | 1988-03-08 | 1991-02-11 | Elin Union Ag | Elektrische maschine mit wassergekuehlter wicklung |
DE4213488C2 (de) * | 1992-04-24 | 1995-05-24 | Wieland Werke Ag | Korrosionsbeständige Kupferlegierung |
US5719447A (en) * | 1993-06-03 | 1998-02-17 | Intel Corporation | Metal alloy interconnections for integrated circuits |
DE59403559D1 (de) * | 1994-04-20 | 1997-09-04 | Wieland Werke Ag | Verwendung einer Kupler-Mangan-Zink-Aluminium-Legierung |
DE102020100020A1 (de) | 2020-01-02 | 2021-07-08 | Lum Gmbh | Verfahren und Vorrichtung für die Bestimmung von Merkmalen von Partikeln durch multiparametrische Erfassung von Streulicht- und Extinktionssignalen |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3259491A (en) * | 1963-05-21 | 1966-07-05 | Olin Mathieson | Copper base alloys and process for preparing same |
US3993479A (en) * | 1975-08-04 | 1976-11-23 | Olin Corporation | Copper base alloy |
-
1986
- 1986-02-22 DE DE19863605796 patent/DE3605796A1/de not_active Withdrawn
-
1987
- 1987-02-21 EP EP87102491A patent/EP0238859B1/fr not_active Expired - Lifetime
- 1987-02-21 AT AT87102491T patent/ATE66496T1/de not_active IP Right Cessation
- 1987-02-21 ES ES87102491T patent/ES2023831B3/es not_active Expired - Lifetime
- 1987-02-21 DE DE8787102491T patent/DE3772233D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE66496T1 (de) | 1991-09-15 |
DE3772233D1 (de) | 1991-09-26 |
EP0238859A3 (en) | 1989-06-07 |
EP0238859A2 (fr) | 1987-09-30 |
ES2023831B3 (es) | 1992-02-16 |
DE3605796A1 (de) | 1987-03-26 |
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