GB2060710A - Solar absorbing coating comprising iron tin alloy - Google Patents
Solar absorbing coating comprising iron tin alloy Download PDFInfo
- Publication number
- GB2060710A GB2060710A GB8031797A GB8031797A GB2060710A GB 2060710 A GB2060710 A GB 2060710A GB 8031797 A GB8031797 A GB 8031797A GB 8031797 A GB8031797 A GB 8031797A GB 2060710 A GB2060710 A GB 2060710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solar
- tinplate
- iron
- tin alloy
- tin
- 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- Withdrawn
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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
- F24S70/25—Coatings made of metallic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Sustainable Development (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
Abstract
A solar absorbing selective coating comprising an iron-tin alloy is formed by determining conventional tinplate to expose the FeSn2 layer. The layer may be coated with wax for corrosion protection and a solar fluid heater may be made from the detinned tinplate.
Description
SPECIFICATION
Selective solar absorbing coating and method for producing same
The present invention relates to selective coatings for solar energy absorbers and to methods for producing same.
Many types of coatings for solar energy collectors are known. For these coatings to be useful, they must be characterized by relatively high absorbance and relatively low emittance.
Standard black coatings, such as black paint, have high absorbance. Their emittance is also relatively high, however, and this limits their overall efficierscy. Conventionai selective coatings such as black nickel or black chrome have a relatively high absorbance and low emissivity, such as 0.9 and 0.1 respectively.
Selective coatings for solar energy collectors, involve significant expense in application and materials. Some conventional selective coatings are also unstable at high operating temperatures and in corrosive environments.
The present invention seeks to overcome the deficiencies of presently known selective coatings for solar energy collectors and to provide a selective coating having high absorbance and relatively low emittance at a relatively low cost.
There is thus provided in accordance with an embodiment of the present invention a selective coating comprising an iron-tin alloy coating.
Further in accordance with an embodiment of the present invention there is provided a method for producing an iron-tin selective coating for a solar collector comprising the steps of providing a tinplate material and removing the tin from at least a portion of a surface of the tinpiate material.
Additionally in accordance with the invention, there is provided a wax coating for solar absorber surfaces which does not interfere with the absorbance and emittance characteristics of the absorber surfaces.
The step of tin removal may take place at any desired stage of fabrication of an article from the tinplate material.
In accordance with a preferred embodiment of the present invention, the iron-tin alloy coating comprises FeSn2.
Further in accordance with an embodiment of the invention, the iron-tin alloy coating may be formed on a steel substrate.
Additionally in accordance with a preferred embodiment of the invention, tinplate material may be used to fabricate a solar water heater. A selected portion of the outer surface of the tinplate material may be subjected to tin removal to define a solar energy collecting surface, while the interior tinplate surface provides rust and corrosion protection for the heater. A solar water heater of this type may be a collector or alternatively an integral tank and collector.
The invention will be more fully understood and appreciated from the following detailed description taken in conjunction with the drawing in which:
Fig. 1 is an illustration of a solar collector constructed and operative in accordance with an embodiment of the present invention; and
Fig. 2 is an illustration of an integral solar
collector constructed and operative in accordance
with an embodiment of the present invention.
In accordance with an embodiment of the
present invention a selective coating is provided by detinning commercial tinplate. The detinning procedure may be entirely conventional and may employ electrochemical or chemical techniques
such as described in Hoare: Tinplate Technology
Tin Research Institute -- London 1 976.
Further in accordance with an embodiment of the invention carbon black or a similar material may be applied to the selective coating surface to enhance absorbance. Furthermore, for corrosion protection an organic coating such as a lacquer or a wax may be applied to the surface without substantially affecting emissivity.
Commerical tinplate is conventionally coated identically or differentially on both sides and each side is characterized by having three major layers: a steel base, tin and its oxides on an outer surface
and, intermediate the two, an alloy layer, typically of thickness 0.05-0.2 microns, which is formed
during the fusion of deposited tin onto the steel in
conventional tinplate manufacture.
The alloy, which has been identified as FeSn2,
has desired properties of high absorbance and low emissivity. Typical experimental levels for these parameters are as follows: Absorbance: 85-95% Emissivity: 10--20% The values of absorbance and emissivity for and
particular sample of material depend on the
surface qualities of the base steel and on
conditions of manufacture. It is understood that the smoother and brighter the finish of the base steel, the lower is the emissivity of the sample.
Various chemical and physical treatments may be employed to enhance absorbance in accordance with the prior art.
It is a particular feature of the present invention
that commercial tinplate can be employed in the fabrication of a solar energy collector, at
significant economies since a rust and corrosion
resistant inner surface is provided by the tinned coating while a collector surface is provided by suitable detinning on the outer surface at desired locations. According to one preferred embodiment of the invention, illustrated in Fig. 1, a solar collector of the selectively coated sheet type is shown formed from tinplate. According to another preferred embodiment of the invention, an integrated collector for direct heating of water as shown in Fig. 2 may be fabricated from conventional tinplate.
Particular economies in manufacture may be
realized due to the relatively low cost of
commercial tinplate on the world market.
According to a preferred embodiment of the invention a wax coating may be applied to the solar absorbing surface. A wax known as KC
1559, manufactured bv the Kindt-Collins
Company of Cleveland, Ohio U.S.A. has been found to be suitable for this purpose. It provides long term protection against corrosion of the absorber surface without appreciably affecting the emissivity and absorption of the absorber surface.
Preferably the wax coating is applied with a thickness of a few microns. The wax coating may be usefully applied to any type of solar absorbing surface. A thickness of 2 microns has been found to provide excellent results.
It will be appreciated by persons skilled in the art that the invention is not limited to what has been particularly shown and described herein.
Rather the scope of the invention is defined only
by the claims which follow:
Claims (12)
1. A solar absorptive selective coating
comprising an iron-tin alloy.
2. A selective coating according to claim 1 and
wherein said iron-tin alloy comprises a compound with an empirical formula FeSn2
3. A selective coating according to claim 1 and
also comprising a steel substrate.
4. A selective coating according to claim 1 and
comprising tinplate from which the tin has been
removed.
5. Solar fluid heating apparatus fabricated from tinplate having at least a portion of its outer surface defining a selective coating comprising an iron-tin alloy.
6. Solar fluid heating apparatus according to claim 5 and wherein said iron-tin alloy comprises
FeSn2.
7. Solar fluid heating apparatus according to claim 6 and comprising a solar collector.
8. Solar fluid heating apparatus according to claim 6 and comprising an integrated solar heater.
9. A method for producing an iron-tin alloy selective coating comprising the steps of:
providing tinplate; and
removing the tin from at least a portion of the tinplate surface.
10. A method of producing a solar fluid heater comprising the steps of:
providing tinplates;
fabricating the heater from the tinplate; and
removing the tin from at least a portion of the outer surface of the heater.
11. Apparatus according to any of claims 1-8 and also comprising a wax coating formed over the selective coating for corrosion protection.
12. A solar absorber defining a solar absorbing surface and comprising a wax coating over said solar absorbing surface for providing corrosion protection.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL58368A IL58368A0 (en) | 1979-10-02 | 1979-10-02 | Selective solar absorbing coating and method for producing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2060710A true GB2060710A (en) | 1981-05-07 |
Family
ID=11051352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8031797A Withdrawn GB2060710A (en) | 1979-10-02 | 1980-10-02 | Solar absorbing coating comprising iron tin alloy |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5691156A (en) |
| AU (1) | AU6308380A (en) |
| BE (1) | BE885891A (en) |
| FR (1) | FR2466721A1 (en) |
| GB (1) | GB2060710A (en) |
| IL (1) | IL58368A0 (en) |
| NL (1) | NL8000445A (en) |
| ZA (1) | ZA806003B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB814174A (en) * | 1955-08-23 | 1959-06-03 | Stahl & Walzwerke Rasselstein | Tin-coating process |
| SE396094B (en) * | 1976-01-05 | 1977-09-05 | Teknoterm Systems Ab | SOLAR ENERGY COLLECTOR |
| GB1532876A (en) * | 1977-08-04 | 1978-11-22 | Widnes Scrap Metal Co Ltd | Process for the de-tinning of tin-plate |
-
1979
- 1979-10-02 IL IL58368A patent/IL58368A0/en unknown
-
1980
- 1980-01-24 NL NL8000445A patent/NL8000445A/en not_active Application Discontinuation
- 1980-03-06 FR FR8005095A patent/FR2466721A1/en active Granted
- 1980-09-29 ZA ZA00806003A patent/ZA806003B/en unknown
- 1980-09-29 JP JP13666680A patent/JPS5691156A/en active Pending
- 1980-10-02 GB GB8031797A patent/GB2060710A/en not_active Withdrawn
- 1980-10-08 AU AU63083/80A patent/AU6308380A/en not_active Abandoned
- 1980-10-27 BE BE0/202605A patent/BE885891A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IL58368A0 (en) | 1980-01-31 |
| ZA806003B (en) | 1981-09-30 |
| AU6308380A (en) | 1981-04-16 |
| BE885891A (en) | 1981-04-27 |
| FR2466721A1 (en) | 1981-04-10 |
| NL8000445A (en) | 1981-04-06 |
| FR2466721B1 (en) | 1983-03-25 |
| JPS5691156A (en) | 1981-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |