EP2039790A1 - Korrosionsschutzschicht - Google Patents

Korrosionsschutzschicht Download PDF

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Publication number
EP2039790A1
EP2039790A1 EP07116671A EP07116671A EP2039790A1 EP 2039790 A1 EP2039790 A1 EP 2039790A1 EP 07116671 A EP07116671 A EP 07116671A EP 07116671 A EP07116671 A EP 07116671A EP 2039790 A1 EP2039790 A1 EP 2039790A1
Authority
EP
European Patent Office
Prior art keywords
semi
sheet
finished product
aluminum alloy
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.)
Withdrawn
Application number
EP07116671A
Other languages
German (de)
English (en)
French (fr)
Inventor
Manfred Mrotzek
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.)
Hydro Aluminium Deutschland GmbH
Original Assignee
Hydro Aluminium Deutschland GmbH
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 Hydro Aluminium Deutschland GmbH filed Critical Hydro Aluminium Deutschland GmbH
Priority to EP07116671A priority Critical patent/EP2039790A1/de
Priority to PCT/EP2008/062316 priority patent/WO2009037263A1/de
Publication of EP2039790A1 publication Critical patent/EP2039790A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal

Definitions

  • the invention relates to the use of an aluminum alloy as corrosion protection layer on a metal sheet or semifinished product, a sheet metal or semifinished product having a corresponding anticorrosion layer and a heat exchanger.
  • Heat exchangers are often exposed to a corrosive environment.
  • the cooling medium leading parts of a heat exchanger in case of poor maintenance of the cooling medium constantly exposed to corrosive attack.
  • the case may occur that the medium to be cooled assumes a pH of about 3.
  • the aluminum-protecting aluminum oxide layer which normally forms, is automatically insoluble in acidic media only up to about pH 4.5.
  • corrosion of the underlying aluminum begins after dissolution of the oxide layer. From the prior art it is now known to increase the corrosion resistance, for example of a sheet or semi-finished product by applying a coating consisting of an aluminum-zinc alloy.
  • the improvement in corrosion resistance is attributed to the fact that the zinc contained in the aluminum-zinc alloy produces a pH-increasing buffer layer near the surface, with the near-surface zinc going into solution. This results in an aluminum-zinc alloy layer, which has an increasing zinc content with increasing layer depth.
  • the alloying component zinc is a problem because zinc is not commonly used in other aluminum alloys in the resulting, relatively large amounts. Accordingly, recycled aluminum alloys can not be used flexibly in other areas.
  • an aluminum-manganese alloy which has a magnesium (Mg) content of 0.05 to 0.40 wt .-% to improve the strength and to improve the corrosion resistance.
  • Mg magnesium
  • magnesium can influence the soldering properties.
  • fluxes for soldering based on potassium fluoride are used. With these fluxes, the magnesium from the aluminum alloy reacts with the fluorine, resulting in poorer soldering results.
  • the present invention has the object to provide an aluminum alloy for use as a corrosion protection layer of sheets or semi-finished products and corresponding sheets or semi-finished products and heat exchangers produced therefrom, so that with constant corrosion resistance, the solderability of the sheets or semi-finished and the recyclability of the components or heat exchangers produced therefrom are optimized.
  • the above-described object is achieved by the use of an aluminum alloy in that the aluminum alloy contains manganese as the main alloying component and silicon, optionally iron, titanium and chromium as secondary alloying components, as well as impurities containing the following alloying constituents in% by weight : mg + Zn ⁇ 0 . 1 % ,
  • an aluminum alloy with manganese as the main alloying component which is virtually free of magnesium and zinc in addition to silicon or in which the content of both alloying components in total is at most 0.1 wt .-%, has a very good corrosion resistance and at the same time Easy to recycle and solder.
  • the aluminum alloy used is very resistant in particular with media having a pH of about 3 and is due to the low Zn and Mg contents well solderable and recyclable.
  • the aluminum alloy is used for a plated corrosion protection layer or for a corrosion protection layer simultaneously cast with the material of the sheet or semi-finished product.
  • roll cladding By using roll cladding, it is possible to economically produce large quantities of sheet metal with a very precisely defined thickness of the anticorrosive layer, whereby a particularly good bond between core layer and anticorrosion layer is achieved by roll cladding. Simultaneous pouring of anti-corrosion coating with the Material of the sheet or semi-finished product leads to the reduction of the number of work steps for the production of the corrosion protection layer on a sheet or semi-finished product. Separate roll cladding of the aluminum alloy for a corrosion protection layer on the sheet or semi-finished product is then no longer necessary.
  • a combination of roll cladding and simultaneous casting is also conceivable, for example when further functional layers are needed.
  • the AlMn-aluminum alloy used has a manganese content of 1.2 to 1.8 wt .-%, so that optimum corrosion resistance is ensured. Below 1.2 wt%, the effect of manganese to ensure the corrosion resistance of the anticorrosion layer is not so pronounced. Above 1.8% by weight, coarse manganese precipitates may form in the microstructure of the anticorrosive layer due to the limited solubility of manganese. These coarse precipitations can in principle lead to a reduced corrosion resistance of the corrosion protection layer.
  • the aluminum alloy has a Zn content of at most 0.05 wt%.
  • a local element is a small-area corrosion element which forms a short-circuited galvanic cell in an electrically conductive manner, for example connected by an electrolyte. This can lead to pitting corrosion.
  • the Aluminum alloy used in the invention has a copper content of at most 0.05 wt .-%.
  • Silicon in an amount of 0.3 to 0.8 wt .-% leads to an improvement in the strength of the anticorrosion layer by solid solution hardening and can thus contribute to the strength of the sheet or semi-finished. At a content of less than 0.30 wt .-%, this effect is only slightly pronounced. Above 0.8 wt.%, The melting temperature of the aluminum alloy decreases too much, so that it comes close to the melting temperature of the aluminum solders, which usually have higher amounts of silicon. Melting of the corrosion protection layer, for example, during soldering is not desirable.
  • the aluminum alloy used according to a next further embodiment has a chromium content of 0.05 to 0.25 wt .-%. Chromium improves the recrystallization of the corrosion protection layer during soldering and thus leads to a particle size reduction. Above a content of 0.25 wt .-%, however, coarse primary precipitates may arise, which in turn adversely affect the structure of the corrosion protection layer.
  • the aluminum alloy used has a maximum of 0.5% by weight of iron. Above an iron content of 0.5 wt .-% local element formation can not be excluded. The iron content of at most 0.5 wt .-%, it is possible to reduce the cost of producing the aluminum alloy used, for example, by scrap iron-containing aluminum alloys Preparation of the aluminum alloy used for the anti-corrosion layer can be used.
  • the titanium content of the aluminum alloy used in a next embodiment is limited to a content of at most 0.05 wt%. Titanium is added to grain refining during casting of the aluminum alloy to be produced. Titanium, however, shows an interaction with chromium, so that at higher Ti contents together with existing chromium can lead to unwanted primary crystal formation, which also leads to a poorer forming behavior of the corrosion protection layer.
  • the above-described object is achieved by a sheet or semi-finished product comprising at least one core layer made of a first aluminum alloy and at least one anticorrosive layer produced by the use of an aluminum alloy according to the invention.
  • sheets or semi-finished products which have a corresponding anticorrosion layer can not only be recycled particularly well, they also achieve good solderability with high corrosion resistance.
  • the corrosion protection layer has a thickness of 10 to a maximum of 100 ⁇ m. At a thickness of less than 10 microns sufficient corrosion resistance in, for example, water-bearing components or sheets is no longer guaranteed. Whereas, at a thickness of more than 100 ⁇ m, the corrosion resistance is not further improved.
  • the corrosion protection layer is plated or simultaneously cast together with the material of the sheet or semi-finished product.
  • plating is achieved by jointly hot rolling a sheet / bar from the corrosion protection layer and a sheet / billet of the (core) material of the sheet or semi-finished a cohesive connection with high efficiency.
  • a further reduction of the work steps for producing a composite of sheet metal or semifinished material and the corrosion protection layer of an aluminum alloy according to the invention can be achieved by simultaneous casting of the material of the sheet or semi-finished product and the corrosion protection layer.
  • the sheet or semifinished product comprises at least one further functional layer
  • additional properties of the sheet or semifinished product can be ensured.
  • a second cladding layer made of an aluminum solder is often provided, in particular in the case of sheets or semi-finished products for heat exchangers, so that good solderability is achieved even in the case of inaccessible solder joints.
  • cladding layers of an aluminum alloy with particularly high strength can be provided, which achieve an increase in the mechanical rigidity of the component.
  • the sheet metal or semifinished product according to the invention is particularly advantageously configured in that the sheet or semifinished product is designed for use in a heat exchanger, since, in particular in the production of heat exchangers, on the one hand very good solderability and, on the other hand, improved environmental conditions Recyclability of heat exchangers, in particular heat exchangers of motor vehicles is required.
  • the sheet or semifinished product can be made particularly simple for use in a heat exchanger in that the sheet or semi-finished product has been converted into a tube, wherein at least the water-carrying inside of the tube has the corrosion protection layer. Equipped with appropriate tubes heat exchangers show a particularly high corrosion resistance even with acidic media having a pH of about 3.
  • a heat exchanger in which at least the water-carrying components are made from a sheet or semi-finished product according to the invention.
  • Heat exchangers for motor vehicles are particularly advantageous, since these are subject to strict recycling regulations as part of motor vehicles.
  • a chromium content of 0.05 to 0.25 wt .-% may also be provided in the aluminum alloy of the corrosion protection layer 2.
  • the anticorrosive layer 2 shows a good anticorrosive behavior even on contact with media which have a pH of about 3.
  • the magnesium content of the corrosion protection layer is low according to the invention, so that close to no reactions with potassium fluoride-containing fluxes arise.
  • soldering a sheet provided with a corresponding anticorrosion layer 2 therefore, good results are obtained.
  • the sheet metal 1 and semifinished products produced therefrom and scrap produced during production can be recycled very well, since the alloy composition is almost free of zinc.
  • a manufactured from the sheet 1 tube 5 is shown in a schematic cross-sectional view.
  • the anticorrosion layer 2 and the aluminum solder layer 4 are usually bonded to the core layer 3 by roll-plating.
  • the connection is achieved in roll cladding in that the core layer 3 is additionally hot rolled together with the layers 2 and 4, so that due to the high temperature a cohesive connection between the individual layers is achieved.
  • a correspondingly produced sheet 1 can therefore also be converted to a tube 5 well.
  • a cooling medium can be guided, wherein the corrosion protection layer 2 protects the core layer 3 from corrosion.
  • the preferably consisting of an aluminum solder 4 outer layer of the tube 5 serves to the pipe 5, for example, in the manufacture of a Heat exchanger 6 to be soldered to the other components of the heat exchanger.
  • a heat exchanger 6 in a schematic cross-sectional view shows the Fig. 3 ,
  • the heat exchanger 6 is preferably made of a laminated plate package 7 and the cooling medium leading tubes 5.
  • the in Fig. 3 Of course, only one possible embodiment of a heat exchanger is shown. It is characteristic that heat exchangers are usually soldered and cooling media have leading components, such as pipes, etc.
  • the inside, on which the cooling medium, preferably water, leading inside coated with the corrosion protection layer 2 tubes 5 and components of a heat exchanger can also be operated with a cooling medium, which at least temporarily has a pH of about 3, without the corrosion resistance the heat exchanger is at risk.
  • the heat exchangers 6 can be recycled particularly easily, since the zinc content in the aluminum alloy used is very low.
EP07116671A 2007-09-18 2007-09-18 Korrosionsschutzschicht Withdrawn EP2039790A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07116671A EP2039790A1 (de) 2007-09-18 2007-09-18 Korrosionsschutzschicht
PCT/EP2008/062316 WO2009037263A1 (de) 2007-09-18 2008-09-16 Korrosionsschutzschicht

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07116671A EP2039790A1 (de) 2007-09-18 2007-09-18 Korrosionsschutzschicht

Publications (1)

Publication Number Publication Date
EP2039790A1 true EP2039790A1 (de) 2009-03-25

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ID=38969470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07116671A Withdrawn EP2039790A1 (de) 2007-09-18 2007-09-18 Korrosionsschutzschicht

Country Status (2)

Country Link
EP (1) EP2039790A1 (un)
WO (1) WO2009037263A1 (un)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167940A (zh) * 2010-02-26 2011-08-31 Tcl集团股份有限公司 应用于空调换热器翅片上的钛金涂层材料及其制备方法
CN102192620A (zh) * 2011-07-01 2011-09-21 Tcl空调器(中山)有限公司 一种空调用钛金换热器及其加工方法
EP3026134A1 (de) * 2014-11-27 2016-06-01 Hydro Aluminium Rolled Products GmbH Wärmetauscher, verwendung einer aluminiumlegierung und eines aluminiumbands sowie verfahren zur herstellung eines aluminiumbands
WO2017182145A1 (de) * 2016-04-19 2017-10-26 Hydro Aluminium Rolled Products Gmbh Aluminiumverbundwerkstoff mit korrosionsschutzschicht
EP3269485A1 (de) 2016-07-14 2018-01-17 Modine Manufacturing Company Flussmittelarmes cab-löten bei wärmeübertragern

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2877317B2 (en) 2012-07-27 2022-07-27 Gränges Sweden AB Strip material with excellent corrosion resistance after brazing
CN111702414A (zh) * 2020-06-02 2020-09-25 江苏新程(武汉)汽车零部件有限公司 一种高性能车用防护板及其加工方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296522A1 (fr) 1974-12-31 1976-07-30 Alusuisse Materiau composite a base d'aluminium resistant a la corrosion
DE3127980A1 (de) * 1980-07-15 1982-04-08 Kabushiki Kaisha Kobe Seiko Sho, Kobe Hartgeloeteter aluminium-waermetauscher
JPH0288740A (ja) * 1988-09-22 1990-03-28 Mitsubishi Alum Co Ltd 耐孔食性のすぐれた熱交換器の作動流体接触構造部材用高強度Ａｌ合金クラッド材
JPH03134129A (ja) * 1989-10-18 1991-06-07 Showa Alum Corp ろう付用アルミニウム合金
JPH06278243A (ja) * 1993-03-26 1994-10-04 Nippon Steel Corp 成形加工性、耐食性および焼付硬化性に優れたアルミニウム合金合わせ板
JP2000248325A (ja) * 1999-02-26 2000-09-12 Denso Corp アルミニウム合金配管材
EP1247873A1 (de) * 2001-04-04 2002-10-09 VAW Aluminium AG Verfahren zur Herstellung von AlMn-Bändern oder -Blechen
WO2006041518A1 (en) 2004-10-01 2006-04-20 Pechiney Rolled Products Brazing sheet suitable for use in heat exchangers and the like

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296522A1 (fr) 1974-12-31 1976-07-30 Alusuisse Materiau composite a base d'aluminium resistant a la corrosion
DE3127980A1 (de) * 1980-07-15 1982-04-08 Kabushiki Kaisha Kobe Seiko Sho, Kobe Hartgeloeteter aluminium-waermetauscher
JPH0288740A (ja) * 1988-09-22 1990-03-28 Mitsubishi Alum Co Ltd 耐孔食性のすぐれた熱交換器の作動流体接触構造部材用高強度Ａｌ合金クラッド材
JPH03134129A (ja) * 1989-10-18 1991-06-07 Showa Alum Corp ろう付用アルミニウム合金
JPH06278243A (ja) * 1993-03-26 1994-10-04 Nippon Steel Corp 成形加工性、耐食性および焼付硬化性に優れたアルミニウム合金合わせ板
JP2000248325A (ja) * 1999-02-26 2000-09-12 Denso Corp アルミニウム合金配管材
EP1247873A1 (de) * 2001-04-04 2002-10-09 VAW Aluminium AG Verfahren zur Herstellung von AlMn-Bändern oder -Blechen
WO2006041518A1 (en) 2004-10-01 2006-04-20 Pechiney Rolled Products Brazing sheet suitable for use in heat exchangers and the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SPIEKERMANN P: "LEGIERUNGEN - EIN BESONDERES PATENTRECHTLICHES PROBLEM? - LEGIERUNGSPRUEFUNG IM EUROPAEISCHEN PATENTAMT -", MITTEILUNGEN DER DEUTSCHEN PATENTANWAELTE, HEYMANN, KOLN,, DE, 1993, pages 178 - 190, XP000961882, ISSN: 0026-6884 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167940A (zh) * 2010-02-26 2011-08-31 Tcl集团股份有限公司 应用于空调换热器翅片上的钛金涂层材料及其制备方法
CN102167940B (zh) * 2010-02-26 2013-01-23 Tcl集团股份有限公司 应用于空调换热器翅片上的钛金涂层材料及其制备方法
CN102192620A (zh) * 2011-07-01 2011-09-21 Tcl空调器(中山)有限公司 一种空调用钛金换热器及其加工方法
EP3026134A1 (de) * 2014-11-27 2016-06-01 Hydro Aluminium Rolled Products GmbH Wärmetauscher, verwendung einer aluminiumlegierung und eines aluminiumbands sowie verfahren zur herstellung eines aluminiumbands
WO2016083454A1 (de) * 2014-11-27 2016-06-02 Hydro Aluminium Rolled Products Gmbh Wärmetauscher, verwendung einer aluminiumlegierung und eines aluminiumbands sowie verfahren zur herstellung eines aluminiumbands
WO2017182145A1 (de) * 2016-04-19 2017-10-26 Hydro Aluminium Rolled Products Gmbh Aluminiumverbundwerkstoff mit korrosionsschutzschicht
EP3269485A1 (de) 2016-07-14 2018-01-17 Modine Manufacturing Company Flussmittelarmes cab-löten bei wärmeübertragern

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