EP0771888A1 - Procede de protection contre la corrosion externe dans des echangeurs de chaleur en cuivre - Google Patents

Procede de protection contre la corrosion externe dans des echangeurs de chaleur en cuivre Download PDF

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Publication number
EP0771888A1
EP0771888A1 EP96915036A EP96915036A EP0771888A1 EP 0771888 A1 EP0771888 A1 EP 0771888A1 EP 96915036 A EP96915036 A EP 96915036A EP 96915036 A EP96915036 A EP 96915036A EP 0771888 A1 EP0771888 A1 EP 0771888A1
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EP
European Patent Office
Prior art keywords
nucleus
based alloy
alloy
coating
alloys
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Withdrawn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
EP96915036A
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German (de)
English (en)
Inventor
José Manuel ARAGUES BERNAD
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.)
Valeo Termico SA
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Valeo Termico SA
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Publication date
Application filed by Valeo Termico SA filed Critical Valeo Termico SA
Publication of EP0771888A1 publication Critical patent/EP0771888A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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

Definitions

  • the invention refers to a procedure for protecting copper-based heat exchangers against external corrosion which consists of the coating and thermal diffusion of a tin-based alloy on a copper-based nucleus, by which a composite material which offers excellent performance against corrosion is formed.
  • the invention also refers to the said composite material, to fins for heat exchangers made of the said material and to heat exchangers which incorporate such fins, and also to their manufacturing process.
  • Heat exchangers especially radiators intended for the cooling of motors in automobiles and agricultural and industrial machinery (heat engines), which consist of a central nucleus, known as the core, consisting of a set of tubes for the circulation of the liquid coolant, plus several fins in contact with the tubes in order to produce the exchanging of heat.
  • the radiator is completed by tanks and header plates which close the circuit of the liquid coolant.
  • some lateral steel supports are included in order to increase its rigidity.
  • the core tubes are of brass
  • the fins are of copper (Cu)
  • the tube-fin joint is made with tin-based solders (Sn).
  • Sn-based solder is provided by the brass tube, which has been previously coated with solder, mainly by immersion in a bath of molten solder.
  • Soldering of the core can be carried out in continuous or static furnaces with an oxidizing atmosphere. Usually the soldering of the core is carried out in two stages, the first in a furnace, in which the tubes are soldered to the fins, and the second in which the ends of the tubes are soldered to the header plates by systems such as capillary attraction (immersion in baths of molten Sn), the projection of Sn (splashing or spraying), etc.
  • solder "flux" (or a scourer of the metals to be joined and a protector of the actual soldering during the operation) should be applied, either by immersion of the core or by the projection of the flux onto the core.
  • the fluxes normally used are those of a mineral type which contain inorganic halides, such as zinc or ammonium chlorides, hydrochloric acid, etc., although other fluxes of a mixed type, with organic and inorganic components, such as amino hydrochlorates and hydrobromates, hydrobromic acid, etc. are also used.
  • vapours are given off which contain, among other compounds, hydrochloric acid, hydrobromic acid, ammonia and amine compounds, which are also aggressive to the environment, so that additional operations of cleaning the vapours generated have to be carried out, which makes the process more expensive and complicated.
  • a further additional problem caused by current radiator manufacturing processes relates to the application of an anti-corrosion protection, since at present this operation is carried out once the manufacture of the radiator is completed, by means of the application of an anti-corrosion paint by projection, which only covers the external areas of the radiator with paint, but does not cover the core nucleus. Normally the paint penetrates only about 2 mm into each face of the core.
  • copper radiators provide excellent service in respect of thermal transfer, mechanical strength and internal corrosion.
  • resistance to external corrosion is problematic.
  • the present invention provides a solution to the problems raised.
  • the new material provided by this invention consists of a Cu-based nucleus, an intermediate layer consisting of Cu-Sn alloys of variable composition and an external surface formed, basically, by an Sn-based alloy.
  • This material can be obtained by means of thermal diffusion, under controlled conditions, of a coating of Sn-based alloys deposited on a Cu-based nucleus.
  • this new material involves a series of changes in radiator manufacturing procedure, one of which lies in the possibility of carrying out the soldering of the core in ovens with a controlled atmosphere.
  • the soldering can be carried out without the use of any kind of flux, which is impossible to achieve with current technologies.
  • This method of carrying out soldering of the core provides enormous environmental improvements since gaseous effluents and aqueous contaminants are not produced and, at the same time, significant reductions in energy consumption are achieved.
  • the cores constructed with this new material can also be soldered in an oven with an oxidizing atmosphere, although in this case an organic non-corrosive flux which does not require cleaning may be used, so that notable advantages are achieved in comparison with current radiator manufacturing technology.
  • Figure 1 is a photograph which shows perforating corrosion in a core tube, of arsenical brass [Cu-Zn 70/30, As 0.03%], after a test of 92 hours in a saline mist at a magnification of 20/1. In the photograph the leakage area is indicated by an arrow.
  • Figure 2 is a photograph showing perforating corrosion in a core tube, of arsenical brass (Cu-Zn 64/36, As 0.03%], after 120 hours of testing in a saline mist, at a magnification of 20/1.
  • the leakage area is indicated by an arrow.
  • Figure 3 is a photograph showing intercrystalline corrosion on and removal of zinc from a core tube, of arsenical brass [Cu-Zn 67/33 As 0.03%], as well as corrosion in the Sn-Pb solder, after 144 hours of testing in a saline mist, at a magnification of 390/1 ( Figure 3A) and at a magnification 325/1 ( Figure 3B).
  • Figure 4 is a photograph showing corrosion by the removal of zinc from a core tube, of phosphorized brass [Cu-Zn 66/34 P], after 244 hours of testing in a saline mist, at a magnification of 260/1 ( Figure 4A), and perforating corrosion (intercrystalline and zinc removal) in the said core tube after 244 hours of testing in a saline mist, at a magnification of 260/1 ( Figure 4B).
  • Figure 5 is a photograph showing corrosion on a fin after 144 hours of testing in a saline mist, at a magnification of 260/1 ( Figure 5A), and also at a magnification of 360/1 ( Figure 5B).
  • the core tube is made of arsenical brass [Cu-Zn 67/33 As 0.03%] and the fin of Cu-Sn (0.01% Sn).
  • Figure 6 is a photograph showing the appearance of a radiator core which incorporates fins manufactured with a composite material provided by this invention, after 1,170 hours of testing in a saline mist (0.5 enlargement [0.5X]).
  • Figure 7 is a photograph showing an enlarged detail of Figure 6 (2X).
  • Figure 8 is a photograph showing the appearance of the tube after 1,008 hours of testing in a saline mist (5X). As can be seen, there are no noticeable attacks due to corrosion on the brass and the Sn-Pb film on the base metal is maintained.
  • Figure 9 is a photograph showing the appearance of a cross-section of the tube after 1,008 hours of testing in a saline mist (1,000X).
  • the Cu-Sn alloy film on the surface of the brass can be seen, but there are no noticeable points of corrosion.
  • Figure 10 is a photograph showing the appearance of a cross-section of a fin, manufactured with a material provided by this invention, after 1,008 hours of testing in a saline mist (1,000X). By examination through an optical microscope the Cu nucleus and the Cu-Sn alloy film of approximately 1 to 2 ⁇ m over the whole surface of the fin can be seen.
  • Figure 11 is a photograph showing the appearance of the tube-fin joint after 1,008 hours of testing in a saline mist (100X). It can be seen that there is a slight attack on the Sn-Pb solder, but a considerable meniscus is maintained.
  • Figure 12 is a photograph showing an enlarged detail of Figure 16 (200X).
  • Figure 13 is a photograph showing the appearance of a core which contains fins manufactured with a material provided by this invention and soldered in a static oven, in a vacuum, under N 2 pressure and without the use of any kind of flux.
  • Solders also suffer galvanic corrosion after the accelerated external corrosion tests (Figure 3A). At the tube-solder-fin joint, the Sn solder and the brass tube are attacked preferentially because of their anodic character as opposed to the copper fins.
  • the differences in potential between the Sn-Pb solders and the Cu (fins) reach values of 300mV so that high-intensity galvanic batteries are formed which cause the corrosion detected in the tests.
  • the procedure for protection against external corrosion in heat exchangers based on copper, especially in radiators for cooling heat engines, motors, and more particularly, automobile radiators, consists of the coating and thermal diffusion of a tin-based alloy on a copper-based nucleus, such that a composite material is formed which has an excellent performance against corrosion.
  • the procedure of this invention eliminates the corrosion mechanism which produces perforated points in core tubes (brass) manufactured in accordance with state of the art procedures and corrosion in the solder and on the fins is significantly reduced. All these corrosion processes involve a great reduction in the operating characteristics of heat exchangers and especially in automobile radiators since, whilst perforating corrosion in the core tubes makes the radiator useless, corrosion on the fins and in the solder causes significant losses in the thermal and mechanical characteristics of the radiator.
  • the invention provides a procedure for the protection of heat exchangers which consists of the formation of a new composite material, suitable for the manufacture of fins for heat exchangers, consisting of a Cu-based nucleus, and external surface which consists of an Sn-based alloy and an intermediate layer consisting of Cu-Sn alloys of variable composition, obtained by the coating and thermal diffusion, under controlled conditions, of an Sn-based alloy deposited on a Cu-based nucleus.
  • this invention provides a procedure for protection against external corrosion in heat exchangers based on copper characterized by
  • Cu-based nucleus refers to a material constituted principally and basically of Cu which, optionally, may be weakly alloyed with one or more metals, selected from the group consisting of, for example, Te, Mg, Zn, Sn, Cd, Cr, Ag, Pb, In, Be, Zr, Fe, P, Al and Ni, which in their entirety may be present in a concentration less than 0.2% by weight.
  • metals selected from the group consisting of, for example, Te, Mg, Zn, Sn, Cd, Cr, Ag, Pb, In, Be, Zr, Fe, P, Al and Ni, which in their entirety may be present in a concentration less than 0.2% by weight.
  • These elements added to the Cu have the purpose of increasing the thermal resistance of the Cu so that its mechanical properties are maintained after the thermal cycles of soldering of the core. At the same time, these elements enable the highest possible values of thermal conductivity to be assured in order to obtain the most appropriate radiator performance.
  • Sn based alloys includes pure Sn and any alloy of Sn with other metals.
  • the preferred Sn-based alloys used to prepare the composite material of this invention consist of:
  • Sn-based alloys present an anodic electro-chemical potential with respect to the Cu-based nucleus, which permits effective protection of the Cu against attack caused by natural or artificial environments which contain, among other compounds, inorganic chlorides, nitrogenous compounds and sulphur oxides, thereby significantly increasing the life of the radiator fin and by achieving satisfactory preservation of the mechanical and thermal properties of the fins it allows the radiator thicknesses and weights to be reduced.
  • the composite material formed should have a minimum thickness of 1 micron ( ⁇ m).
  • this thickness is considered to be determined by the sum of the thickness of the intermediate layer, consisting of the Cu-Sn alloys of variable compositions, and the thickness of the external surface, consisting of the Sn-based alloy.
  • the thickness of the intermediate layer and the outermost surface should be between 1 ⁇ m and 1/5 of the total thickness of the composite material, including the thickness of the Cu-based nucleus. In practice, it has been noted that a total thickness of between 2 and 4 ⁇ m gives good results.
  • the manufacture of the composite material consists of the coating of the Cu-based nucleus with an Sn-based alloy and the thermal diffusion of the said alloy deposited on the Cu-based nucleus.
  • the depositing or application of the said Sn-based alloy on the Cu-based nucleus may be carried out by various procedures.
  • the coating of the nucleus may be carried out by immersing the said Cu-based nucleus continuously in a bath of molten Sn-based alloy, the coating layer being controlled by a stream of air, inert gas, water or lamination. In the latter case, the thermal diffusion of the alloy is produced simultaneously with the coating of the nucleus.
  • the said coating may be carried out by projecting the molten Sn-based alloy, by wave or by cascade, onto the Cu-based nucleus.
  • the thermal diffusion of the alloy is also produced simultaneously with the coating of the nucleus with the said alloy.
  • the coating may be carried out by depositing a metallic powder which consists of pore Sn or an Sn-based alloy, or of pastes which contain a metallic powder consisting of pure Sn or an Sn-based alloy, on the Cu-based nucleus, followed by thermal treatment at a temperature equal to or greater than 300°C so that thermal diffusion of the alloy on the Cu-based nucleus takes place.
  • the coating of the Cu-based nucleus with an Sn-based alloy may be carried out by electrodeposition of pore Sn or Sn-based alloys onto the Cu-based nucleus, followed by thermal diffusion at a temperature equal to or greater than 300°C.
  • the coating with the Sn-based alloy can be applied onto the Cu-based nucleus in the form of a strip with a thickness suitable for the manufacture of fins for heat exchangers, or alternatively, it can have a thickness greater than that necessary for the manufacture of such fins, in which case, a stage of lamination of the composite material can be carried out, once it has been formed, until a thickness suitable for the manufacture of fins is obtained.
  • the Sn-based alloy can be applied onto the fins constructed from strips of uncoated Cu and also onto a conventional core constructed of brass tubes and Cu fins.
  • the coating of the Cu-based nucleus with the Sn-based alloy may be total or partial.
  • the partial coating may preferably be carried out by electrodeposition of pure Sn or of the Sn-based alloy, or by projecting the molten Sn-based alloy, or by deposition either of a metallic powder which contains pure Sn or an Sn-based alloy, or of pastes which contain a metallic powder consisting of pure Sn or the Sn-based alloy, onto the area of the Cu-based nucleus to be coated, followed by thermal diffusion at a temperature equal to or greater than 300°C.
  • the coating When the Sn-based alloy is applied onto the core, the coating may be applied either onto the whole core or onto its external surfaces. In view of the fact that corrosion on the external surfaces of the core is more important, the coating may be applied in such a way that it only affects the external areas of the core and not its central nucleus. In an application peculiar to this invention, the composite material may not be present over the whole width of the fins but may cover only the front and rear surfaces of the core to a depth of up to 1/3 of the width of the core.
  • the partial coating may preferably be applied to the surfaces to be coated by electrodeposition of pure Sn or of an Sn-based alloy, by projecting either molten Sn or molten Sn-based alloy, or by depositing either a metallic powder containing pure Sn or an Sn-based alloy, or of pastes which contain a metallic powder consisting of pure Sn or an Sn-based alloy, onto the core surface to be coated, followed by thermal diffusion at a temperature equal to or greater than 300°C.
  • the said composite material allows the use of both an oven with an oxidizing atmosphere and an oven with a controlled non-oxidizing atmosphere.
  • soldering of the core can be carried out in ovens with a controlled non-oxidizing atmosphere, so that the soldering operation is carried out without any kind of flux, which enormously simplifies the heat exchanger manufacturing process since the installations for fluxing, washing and drying are eliminated.
  • this technology significant energy savings are obtained and gaseous and aqueous effluents are eliminated, so it presents a very favourable impact on the environment.
  • this technology also takes into account the possibility of carrying out the soldering of the ends of the tubes to the header plates in the same operation as that of soldering the tubes to the fins. To do this, it is only necessary to apply locally an Sn-based solder, without flux or including a very weak, non-corrosive organic flux, which produces no environmental problem. This is possible due to the favourable conditions of the controlled non-oxidizing atmosphere of the oven.
  • alcoholic rosin solutions de-activated or activated with organic acids or amines
  • organic acids or amines for example rosin:isopropanol (10:90), rosin: glutamic acid:isopropanol (10:2:88) or rosin:dibutylamine hydrochlorate:dimethylamine hydrochlorate:isopropanol (10:2:4:84).
  • an additional aim of this invention consists of a procedure for the manufacture of heat exchangers based on copper, especially radiators for cooling heat engines, and more especially automobile radiators, in which the fins are composed of, or are totally or partially coated with, the composite material provided by this invention, which includes a stage of soldering the tubes to the said fins, which can be carried out:
  • Another additional aim of this invention consists of fins for heat exchangers, especially suitable for use in the manufacture of radiators for cooling heat engines, such as radiators for automobiles, essentially consisting of the composite material provided by this invention.
  • Such fins can be manufactured by means of coating and thermal diffusion of an Sn-based alloy onto a Cu-based nucleus in the form of a strip with a thickness appropriate for the manufacture of the fins, or alternatively, it can have a thickness greater than that necessary for the manufacture of such fins, in which case, a stage for the lamination of the composite material can be carried out, once it has been formed, until a thickness appropriate for the manufacture of fins is obtained.
  • such fins are manufactured starting with a Cu-based nucleus, in the form of a fin and with the appropriate thickness, onto which is applied a coating of an Sn-based alloy over the whole surface of the fin or onto the external edges of such a fin, by means of the application of preformed sheets, threads or cords of Sn alloys, or by means of the electrodeposition of pure Sn or an Sn-based alloy, or by means of the projection of a molten Sn-based alloy, or by the deposition of either a metallic powder which contains pure Sn or an Sn-base alloy, or pastes which contain metallic powder which includes either pure Sn or an Sn-based alloy, followed by thermal diffusion at a temperature equal to or greater than 300°C.
  • the coating of the said fin consisting of a Cu-based nucleus
  • the coating of the said fin may be carried out by immersion of the Cu-based nucleus or the surface strip to be coated in a bath of a molten Sn-based alloy, by projecting pure molten Sn or an Sn-based alloy, by wave or by cascade, with thermal diffusion simultaneous with the coating.
  • a further additional aim of this invention consists of a beat exchanger based on copper, such as a radiator intended for cooling heat engines, more especially a radiator for automobiles, which contains some fins totally or partially manufactured from the composite material obtained by the procedure of this invention.
  • the invention also provides a procedure for depositing Sn-based alloys onto the core of a heat exchanger based on copper, manufactured with state of the art technology, i.e. made of brass tubes and copper fins, which is characterized by the application of the said alloy onto the core in such a way that it covers principally the outer edges of the fins, by electrodeposition, applied to both faces of the core, of either pure Sn or an Sn-based alloy, or of pastes which contain a metallic powder consisting of pure Sn or an Sn-based alloy, followed by thermal diffusion at a temperature equal to or greater than 300°C.
  • Strips of Cu-Sn (0.1% Sn) 0.042 mm thick were coated continuously with an alloy of Sn-Pb (15% Sn + 85% Pb), in a molten bath with a coating thickness of 2 ⁇ m/face. Fins for automobile radiators were manufactured with the material obtained and radiators were assembled including such fins. The soldering of the core was carried out in a continuous oven with an oxidizing atmosphere, using an organic flux. Thermal diffusion was achieved by coating the strip with a molten Sn alloy.
  • Strips of Cu-Cd (0.2% Cd) 0.04 mm thick were coated continuously, with an Sn-Pb molten alloy (25% Sn + 75% Pb), by immersion in a molten bath, and with a coating of 4 ⁇ m/face. Fins for automobile radiators were manufactured with the material obtained and radiators were assembled including these fins. The soldering of the core was carried out in a continuous oven, with an oxidizing atmosphere, using an organic flux. Thermal diffusion was achieved by coating the strip in the molten Sn alloy.
  • Figures 8 to 12 in comparison with Figures 1 to 5 which correspond to radiators constructed according to techniques appertaining to the previous state of the art, submitted to a saline mist test in short duration tests (less than 244 hours) and on which very marked corrosion was produced, demonstrate the greater resistance to external corrosion of copper radiators treated with the protective procedure of the present invention.
  • Fins were manufactured from a strip of Cu coated by an Sn-Pb alloy (60/40), by electrolysis in an aqueous phase. After electrodeposition, thermic diffusion treatment was carried out at 300°C for 30 seconds. Subsequently, radiators were constructed which included the fins described above. The core was soldered in a static vacuum oven. The radiators were submitted to a continuous acetic saline mist test, containing CuCl 2 - CASS TEST - in accordance with Standard ASTM B 368. When the radiator was examined, no significant corrosion was observed on the tubes, the fins or the solder meniscuses.
  • a radiator core was manufactured containing fins manufactured using a composite material provided by this invention having a film of Sn-Cu alloys and Sn with a total thickness of 3 ⁇ m.
  • the soldering was carried out in a static oven, in a vacuum and under a nitrogen pressure of 40 mbars. No kind of flux was used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
EP96915036A 1995-05-16 1996-05-14 Procede de protection contre la corrosion externe dans des echangeurs de chaleur en cuivre Withdrawn EP0771888A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES9500935A ES2129282B1 (es) 1995-05-16 1995-05-16 Procedimiento para la proteccion frente a la corrosion externa en intercambiadores de calor a base de cobre.
ES9500935 1995-05-16
PCT/ES1996/000105 WO1996036749A1 (fr) 1995-05-16 1996-05-14 Procede de protection contre la corrosion externe dans des echangeurs de chaleur en cuivre

Publications (1)

Publication Number Publication Date
EP0771888A1 true EP0771888A1 (fr) 1997-05-07

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EP96915036A Withdrawn EP0771888A1 (fr) 1995-05-16 1996-05-14 Procede de protection contre la corrosion externe dans des echangeurs de chaleur en cuivre

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EP (1) EP0771888A1 (fr)
ES (1) ES2129282B1 (fr)
WO (1) WO1996036749A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008706B1 (fr) * 1978-08-29 1982-05-05 Joh. Vaillant GmbH u. Co. Echangeur de chaleur recouvert d'un alliage de plomb, ledit échangeur faisant partie d'un générateur de chaleur chauffé par un combustible, et procédé pour le revêtement par plombage dudit échangeur de chaleur
JPS5777894A (en) * 1980-10-31 1982-05-15 Tsuchiya Mfg Co Ltd Manufacturing of heat exchanger
JPS5864498A (ja) * 1981-10-13 1983-04-16 Matsushita Electric Ind Co Ltd 熱交換器用表面処理材
JPS60122896A (ja) * 1983-12-06 1985-07-01 Nippon Mining Co Ltd ラジエ−タ−用フイン
JPS60121264A (ja) * 1983-12-06 1985-06-28 Nippon Mining Co Ltd 耐食性に優れたフインを有するラジエ−タ−の製造方法
JPS60194296A (ja) * 1984-03-14 1985-10-02 Nippon Mining Co Ltd 耐食性に優れた熱交換器用材料
JPS61166987A (ja) * 1985-01-17 1986-07-28 Hitachi Cable Ltd ラジエ−タ用フイン材
JPS61179880A (ja) * 1985-12-10 1986-08-12 Hitachi Cable Ltd ラジエ−タ用フイン材の製造方法
JPS6465277A (en) * 1987-09-04 1989-03-10 Furukawa Electric Co Ltd Manufacture of automotive heat-exchanger fin material
JPH03274250A (ja) * 1990-03-23 1991-12-05 Mitsubishi Electric Corp 電子機器用銅合金の溶融めっき方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9636749A1 *

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Publication number Publication date
WO1996036749A1 (fr) 1996-11-21
MX9700433A (es) 1998-07-31
ES2129282B1 (es) 2000-05-16
ES2129282A1 (es) 1999-06-01

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