GB2245276A - Anti-corrosion coating composition - Google Patents
Anti-corrosion coating composition Download PDFInfo
- Publication number
- GB2245276A GB2245276A GB9113025A GB9113025A GB2245276A GB 2245276 A GB2245276 A GB 2245276A GB 9113025 A GB9113025 A GB 9113025A GB 9113025 A GB9113025 A GB 9113025A GB 2245276 A GB2245276 A GB 2245276A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heat exchanger
- coating
- coating composition
- wall
- boilers
- 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
Links
- 239000008199 coating composition Substances 0.000 title description 6
- 238000005260 corrosion Methods 0.000 title description 4
- 238000000576 coating method Methods 0.000 abstract description 18
- 239000011248 coating agent Substances 0.000 abstract description 16
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 11
- 239000010949 copper Substances 0.000 abstract description 11
- 229910052802 copper Inorganic materials 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 9
- 239000000049 pigment Substances 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910002804 graphite Inorganic materials 0.000 abstract description 6
- 239000010439 graphite Substances 0.000 abstract description 6
- 229920002050 silicone resin Polymers 0.000 abstract description 5
- 239000011253 protective coating Substances 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 5
- 230000000379 polymerizing effect Effects 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- 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
-
- 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
- F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
-
- 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
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
-
- 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
- F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Copper heat exchangers for wall-mounted boilers, protected by a coating of silicone resin with iron oxide and graphite pigments. A process for effectively applying such a protective coating to the copper heat exchanger is also described.
Description
IMPROVED COPPER HEAT EXCHANGER FOR WALL-MOUNTED BOILERS 1 This invention
relates to a new copper heat exchanger for wallmounted boilers which is effectively protected against corrosion due to acid condensate and high temperature, thus giving the heat exchanger high efficiency and a longer life. The invention also relates to the specific process for applying the necessary coating to the heat exchanger to be protected. Coatings for protecting the heat exchanger of wall-mounted boilers are already known in the art, and generally consist of silicone resins pigmented with aluminium. Said known aluminium-silicone coatings provide effective protection against high temperature but have the drawback of not being equally effective against condensate because of the chemical nature of the aluminium pigment which is known to be easily attacked by acid solutions and hence deteriorates with consequent loss of the barrier effect against corrosion of the underlying copper. Again, the current tendency towards high-efficiency wall-mounted boilers enhances the problem of corrosion of the heat exchanger copper by acid condensate, so emphasizing the said deficiency of known coatings.
2 The object of the present invention is to overcome said drawback by providing a coating for the copper heat exchanger of wallmounted boilers which besides being resistant to the high temperatures prevailing in modern wall-mounted boilers creates an effective highly anticorrosive barrier protective against the acid condensate which is particularly abundant in high-efficiency wallmounted boilers. This is substantially attained by replacing said aluminium pigment with other protective pigments inert against the aggressive action of acid condensates, such as a mixture of iron oxide and graphite, which in addition to said advantages gives the coating and hence the heat exchanger a black coloration which increases and favours heat transfer. Thus the protection coating for the copper heat exchanger of wall- mounted boilers, said coating consisting of a silicone resin, is characterised by containing as pigment a mixture of iron oxide and graphite. As found experimentally, because of the complex geometry of the heat exchanger the effectiveness of such a protective coating depends strictly on an immersion application process with precisely defined operating parameters. More specifically, the process for applying said coating to the copper heat exchanger of wall-mounted boilers, said process being by immersion, is characterised by the following stages: ediusting the Ford No. 4 cup viscosity of the coating by appropriate dilution with solvent to within a range of 40-55 secons; keeping the heat exchanger to be protected in the conveniently abitatea 1 1 IL Z - coating bath at said viscosity for a time of between 20 and 30 seconds; allowing the coating layer applied to the heat exchanger to dry in air for a time of not less than 30 minutes; and finally polymerizing said coating layer in an oven at 100-1901C for a time 5 of not less than 30 minutes. Exceptionally good experimental results in terms of an effectively protected and hence long-life heat exchanger were obtained by immersing the heat exchanger for 20 seconds in a bath of silicone resin with added iron oxide and graphite having a Ford No. 4 cup viscosity of 42 seconds, then drying the applied heat exchanger coating layer for 30 minutes in air and finally polymerizing said coating layer in an oven for 30 minutes at 165'C.
1. A coating composition comprising a silioone resin containing, as a pigment, iron oxide and graphite.
2. A coating formed on a substrate from a coating composition as claimed in claim 1 by drying and curing a layer of the composition on the substrate.
3. A heat exchanger for a wall-mounted boiler, the heat exchanger being protected by a coating comprising a silicone resin containing, as a pigment, iron oxide and graphite.
4. A heat exchanger as claimed in claim 3, being a copper heat exchanger.
5. A heat exchanger as claimed in claim 3 or 4, wherein the coating is a coating as claimed in claim 2.
6. A process for applying a coating composition as claimed in claim 1 to a heat exchanger of a wall mounted boiler, characterised by the following successive stages: adjusting the Ford No. 4 cup - viscosity of the coating composition by appropriate dilution with solvent to within a range of 40-55 seconds; keeping the heat exchanger to be protected in a coating bath (preferably an agitated coating bath) at said viscosity for a time of between 20 and 30 seconds; allowing the coating layer applied to the heat exchanger to dry in air for a time of not less than 30 minutes; and finally polymerizing said coating layer in an oven at 100-1900C for a time of not less than 30 minutes.
7. A process for applying a coating composition as claimed in claim 1 to a heat exchanger of a wall mounted boiler, characterised by immersing the heat exchanger for 20 seconds in a bath of said coating diluted to a Ford No. 4 cup viscosity of 42 seconds, then drying the applied heat exchanger coating layer for 30 minutes in air and finally polymerizing said coating layer in an oven for 30 minutes at 1650C.
8. A process as claimed in claim 6 or 7, the heat exchanger being a copper heat exchanger.
Published 1991 at 7be Patent Office. Concept House, Cardiff Road. Newport. Gwent Npq IRH. Further copies may be obtained from Sales Branch. Unit 6. Nine Mile Point. Cwmfelinfach. Cross Keys. Newport, N - P1 7HZ. Printed PY Multiplex techniques ltd. St Mary Cray, Kent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT02073990A IT1248980B (en) | 1990-06-22 | 1990-06-22 | PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9113025D0 GB9113025D0 (en) | 1991-08-07 |
| GB2245276A true GB2245276A (en) | 1992-01-02 |
| GB2245276B GB2245276B (en) | 1994-04-13 |
Family
ID=11171333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9113025A Expired - Fee Related GB2245276B (en) | 1990-06-22 | 1991-06-17 | Improved copper heat exchanger for wall-mounted boilers |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE1005573A3 (en) |
| CH (1) | CH682258A5 (en) |
| DE (1) | DE4120563A1 (en) |
| ES (1) | ES2048032B1 (en) |
| FR (1) | FR2663725B1 (en) |
| GB (1) | GB2245276B (en) |
| IT (1) | IT1248980B (en) |
| NL (1) | NL193471C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300543C (en) * | 2003-10-22 | 2007-02-14 | 北京化工大学 | Method for corrosion resistant protection of condensed water system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006054723A1 (en) * | 2006-11-21 | 2008-05-29 | Behr Gmbh & Co. Kg | Heat exchanger, in particular exhaust gas heat exchanger |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1162162A (en) * | 1965-08-13 | 1969-08-20 | Interchem Corp | Improvements relating to Coatings and Coating Compositions |
| GB2066279A (en) * | 1979-12-25 | 1981-07-08 | Toray Silicone Co | Self extinguishing silicone rubber |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES364354A1 (en) * | 1968-03-05 | 1970-12-16 | Hutter Kg S | Treatment of metal surfaces |
| DK132333C (en) * | 1973-01-09 | 1976-04-26 | J Hardenfelt | FILLER OR COATING MIXTURE WITH METAL LOOKING EFFECT |
| NL8204731A (en) * | 1982-12-07 | 1984-07-02 | Pyrotec Nv | INSTALLATION FOR THERMAL CRACKING OF A HYDROCARBON OUTPUT MATERIAL TO OLEGINS, TUBE HEAT EXCHANGER USED IN SUCH INSTALLATION AND METHOD FOR MANUFACTURING A TUBE HEAT EXCHANGER. |
| JPS60171349A (en) * | 1984-02-16 | 1985-09-04 | Matsushita Electric Ind Co Ltd | Heat exchanger |
| US4582727A (en) * | 1984-03-20 | 1986-04-15 | Amax Inc. | Varnish-bonded, carbon-coated metal products |
| DK559887A (en) * | 1986-11-28 | 1988-05-29 | Hoffmann La Roche | PROCEDURE FOR THE PREPARATION OF CARBINOOL DERIVATIVES |
| JPH024195A (en) * | 1988-06-20 | 1990-01-09 | Furukawa Electric Co Ltd:The | Copper or copper alloy u-tube coated with inner surface anti-corrosion coating film for heat exchanger |
-
1990
- 1990-06-22 IT IT02073990A patent/IT1248980B/en active IP Right Grant
-
1991
- 1991-06-17 CH CH1793/91A patent/CH682258A5/it not_active IP Right Cessation
- 1991-06-17 GB GB9113025A patent/GB2245276B/en not_active Expired - Fee Related
- 1991-06-19 BE BE9100591A patent/BE1005573A3/en not_active IP Right Cessation
- 1991-06-20 FR FR919107590A patent/FR2663725B1/en not_active Expired - Fee Related
- 1991-06-20 ES ES09101666A patent/ES2048032B1/en not_active Expired - Lifetime
- 1991-06-21 NL NL9101073A patent/NL193471C/en not_active IP Right Cessation
- 1991-06-21 DE DE4120563A patent/DE4120563A1/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1162162A (en) * | 1965-08-13 | 1969-08-20 | Interchem Corp | Improvements relating to Coatings and Coating Compositions |
| GB2066279A (en) * | 1979-12-25 | 1981-07-08 | Toray Silicone Co | Self extinguishing silicone rubber |
Non-Patent Citations (2)
| Title |
|---|
| J.Col.Soc 10(2) 14-18 (1971) * |
| JP 63218764 (NOK Corp) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300543C (en) * | 2003-10-22 | 2007-02-14 | 北京化工大学 | Method for corrosion resistant protection of condensed water system |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2048032B1 (en) | 1994-10-01 |
| CH682258A5 (en) | 1993-08-13 |
| GB9113025D0 (en) | 1991-08-07 |
| BE1005573A3 (en) | 1993-11-09 |
| NL193471C (en) | 1999-11-02 |
| IT1248980B (en) | 1995-02-11 |
| DE4120563A1 (en) | 1992-01-02 |
| FR2663725A1 (en) | 1991-12-27 |
| GB2245276B (en) | 1994-04-13 |
| FR2663725B1 (en) | 1994-03-04 |
| DE4120563C2 (en) | 1993-04-29 |
| IT9020739A1 (en) | 1991-12-22 |
| NL193471B (en) | 1999-07-01 |
| IT9020739A0 (en) | 1990-06-22 |
| ES2048032A1 (en) | 1994-03-01 |
| NL9101073A (en) | 1992-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030617 |