EP1192295A1 - Article possedant une resistance ameliore a la corrosion du type nid de fourmis - Google Patents

Article possedant une resistance ameliore a la corrosion du type nid de fourmis

Info

Publication number
EP1192295A1
EP1192295A1 EP00930472A EP00930472A EP1192295A1 EP 1192295 A1 EP1192295 A1 EP 1192295A1 EP 00930472 A EP00930472 A EP 00930472A EP 00930472 A EP00930472 A EP 00930472A EP 1192295 A1 EP1192295 A1 EP 1192295A1
Authority
EP
European Patent Office
Prior art keywords
coating
copper
corrosion
further characterized
formicary
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.)
Granted
Application number
EP00930472A
Other languages
German (de)
English (en)
Other versions
EP1192295B1 (fr
Inventor
Sandra J. Downey
Thomas J. Garosshen
Daniel P. Gaffaney
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP1192295A1 publication Critical patent/EP1192295A1/fr
Application granted granted Critical
Publication of EP1192295B1 publication Critical patent/EP1192295B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process

Definitions

  • This invention relates generally to protecting metals from a corrosive environment, and more specifically, to protecting copper from formicary corrosion when used in a corrosive environment.
  • Corrosion is a process that involves two simultaneous reactions which are called half- cells.
  • One half-cell reaction is the oxidation or corrosion ofthe metal. This process involves the loss of electrons, e.g.,
  • Electrons from the oxidation process are in turn used by an associated reduction half- cell reaction, which is often the reduction of oxygen or hydrogen, e.g.,
  • the oxidation reaction (corrosion process) can only proceed at a rate governed by the reduction reaction that uses the electrons from the oxidation process. This is because charge neutrality must be maintained.
  • Prevention of this form of corrosion has typically been accomplished by elimination at least one of the three necessary constituents for its occurrence, i.e., air, moisture, or organic acid. However, when at least one of these constituents cannot be removed, as would be the case in an indoor air conditioning application in which an evaporator coil is wet by condensate by virtue of its dehumidification function, alternate protection methods are needed.
  • the primary object of this invention is to provide an article, such as the copper tubes of an evaporator coil, having improved formicary corrosion resistant properties when used in a corrosive environment.
  • Another object of this invention is to provide a copper article having a coating for inhibiting corrosive activities due to formicary corrosion.
  • Yet another object of this invention is to provide an article formed from copper and having a tin or tin alloy coating for inhibiting formicary corrosion.
  • the article of the present invention including a copper member having a surface and a coating on the surface for preventing formicary corrosion ofthe copper member.
  • the article is a copper tube and the coating formed from one of tin and a tin alloy.
  • the coating has a thickness in the range of 0.10 to 1.00 mil and is uniformly applied to the surface. Most preferably, the thickness ofthe coating is 0.50 mil.
  • FIG. 1 is a perspective view of an evaporator coil incorporating copper tubing treated in accordance with the principles ofthe present invention
  • FIG. 2 is a graph illustrating the performance improvements achieved in accordance with the principles ofthe present invention.
  • the present invention provides for formicary corrosion protection of copper, such as copper tubing used in plate-fin coils.
  • copper such as copper tubing used in plate-fin coils.
  • the present invention is not limited to this specific example and could be used in connection with a number of arrangements where copper members are used in a corrosive environment.
  • FIG. 1 illustrates a plate-fin coil 1 ofthe type typically used in air conditioning units.
  • the coil includes one or more flow circuits for carrying refrigerant therethrough.
  • the coil 1 contains a single flow circuit tube 2 consisting of an inlet line 3 and an outlet line 4, and a plurality of fins 5 extending radially therefrom.
  • evaporator coils of this type are commonly used in corrosive environments.
  • coils of this type are fabricated utilizing copper tubing for the circuit flow tubes. Copper is utilized in tube construction because of its good heat transfer properties, general resistance to corrosion, and ease of fabrication and repair.
  • the exposed surface ofthe copper tube 2 is coated or enriched with a material for preventing formicary corrosion.
  • Tin and tin alloys are the best candidates for this material.
  • substantial improvements in the resistance to formicary corrosion is achieved by coating or impregnating the copper tubing's surface with a layer of material such as tin or tin alloy.
  • FIG. 2 The improvement achieved using the principles ofthe present invention is illustrated graphically in FIG. 2.
  • Testing has shown a greater than twenty fold (20x) improvement in the failure rate of copper when, for example, copper tubing is coated with 0.5 mil of electroplated tin.
  • Other methods of prevention such as using formicary corrosion inhibitors (not including removing one ofthe three factors causing formicary corrosion which is rarely a feasible option), typically show only a three fold (3x) improvement. Accordingly, by coating the formicary-corrosion- susceptible copper tubing with a metal that is resistant to such corrosion, the corrosion resistance ofthe copper tubing is significantly improved.
  • tin alloys containing such metals as zinc, magnesium, copper, gallium, cadmium and lead will also result in improved resistance to formicary corrosion ofthe copper.
  • Other metals also increasing the resistance to formicary corrosion may be used as well.
  • the coating or surface enrichment ofthe copper tubes 2, in the embodiment illustrated, with tin or other discussed material is accomplished prior to the assembly ofthe heat exchanger 10.
  • Potential methods include: (1) hot dipping, (2) electroplating (3) vapor deposition, and (4) ion implantation.
  • This invention includes all coatings that work to prevent formicary corrosion of copper.
  • the proposed approach is very cost effective and maintains the thermal conduction ofthe copper tubing in heat exchanger applications.
  • High thermal conduction is accomplished by using a coating with a relatively high thermal conductivity or by applying very thin coatings.
  • An important aspect ofthe present invention is the production of a uniform coating of formicary corrosion reaction resistant material over the entire exterior surface ofthe flow circuit tubes 2. Regardless ofthe process used, the variables of tube surface preparation, tube preheat temperature, coating composition, and coating thickness need to be carefully controlled to achieve the proper results ofthe present invention.
  • the preparation ofthe exposed surfaces ofthe tube is designed to remove the surface oxide layer from the copper to ensure that the coating material will adhere well to the tube.
  • a number of surface preparation processes are known in industry and include the use of acid reducing gases, fluxes and mechanical abrasion such as shot blasting It is preferred that the coating have high ductility to allow for the subsequent assembly ofthe heat exchanger without damaging the coating. The ductility ofthe coating is determined in part by the coating composition and the thickness ofthe coating.
  • the coating must be thick enough to prevent the penetration ofthe electrolyte, and thin enough to have good formability and cost benefits.
  • the optimal range of thickness is 0.10 mils to 1.0 mils.
  • an article is provided, such as a plate- fin heat exchanger coil, having improved formicary corrosion resistant properties when used in a corrosive environment.
  • a copper tube evaporator is provided having a coating for inhibiting corrosion activities due to formicary corrosion.
  • a plate-fin coil is provided formed from copper tubing with a tin or tin alloy coating for inhibiting formicary corrosion.

Abstract

L'invention concerne un article résistant à la corrosion du type nid de fourmis et comprenant un élément en cuivre dont une surface est dotée d'un revêtement, aux fins d'empêchement de la corrosion du type nid de fourmis de l'élément en cuivre. Dans un mode de réalisation, l'article est un tube en cuivre d'un serpentin à ailette en plaque d'une unité de climatisation, le revêtement étant formé soit à partir d'étain, soit à partir d'un alliage d'étain. De préférence, le revêtement possède une épaisseur se situant entre 0,10 et 1,00 millimètre et il est appliqué de manière uniforme sur la surface, cette épaisseur étant idéalement de l'ordre de 0,50 millimètre.
EP00930472A 1999-06-01 2000-05-08 ARTICLE POSSéDANT UNE RéSISTANCE AMéLIORée à LA CORROSION DU TYPE NID DE FOURMIS Expired - Lifetime EP1192295B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US32422399A 1999-06-01 1999-06-01
US324223 1999-06-01
PCT/US2000/012541 WO2000073537A1 (fr) 1999-06-01 2000-05-08 Article possedant une resistance ameliore a la corrosion du type nid de fourmis

Publications (2)

Publication Number Publication Date
EP1192295A1 true EP1192295A1 (fr) 2002-04-03
EP1192295B1 EP1192295B1 (fr) 2005-11-16

Family

ID=23262638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00930472A Expired - Lifetime EP1192295B1 (fr) 1999-06-01 2000-05-08 ARTICLE POSSéDANT UNE RéSISTANCE AMéLIORée à LA CORROSION DU TYPE NID DE FOURMIS

Country Status (4)

Country Link
EP (1) EP1192295B1 (fr)
DE (1) DE60024087T2 (fr)
ES (1) ES2249268T3 (fr)
WO (1) WO2000073537A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI1769211T1 (sl) * 2004-05-05 2011-06-30 Luvata Oy Cev za prenos toplote izdelana iz zlitine kositra in medenine
CN105401177A (zh) * 2015-12-14 2016-03-16 广东美的暖通设备有限公司 换热器的防腐处理方法、换热器和空调器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229200A (ja) * 1983-06-08 1984-12-22 Matsushita Electric Ind Co Ltd 熱交換器
JPH07166270A (ja) * 1993-12-13 1995-06-27 Mitsubishi Materials Corp 耐蟻の巣状腐食性に優れた銅合金
JPH08178585A (ja) * 1994-12-27 1996-07-12 Paloma Ind Ltd 熱交換器の製造方法
JPH09296997A (ja) * 1996-05-01 1997-11-18 Kobe Steel Ltd 熱交換器用銅又は銅合金管

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0073537A1 *

Also Published As

Publication number Publication date
DE60024087D1 (de) 2005-12-22
WO2000073537A1 (fr) 2000-12-07
EP1192295B1 (fr) 2005-11-16
ES2249268T3 (es) 2006-04-01
DE60024087T2 (de) 2006-07-27

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