GB2288410A - Coated substrate - Google Patents
Coated substrate Download PDFInfo
- Publication number
- GB2288410A GB2288410A GB9510952A GB9510952A GB2288410A GB 2288410 A GB2288410 A GB 2288410A GB 9510952 A GB9510952 A GB 9510952A GB 9510952 A GB9510952 A GB 9510952A GB 2288410 A GB2288410 A GB 2288410A
- Authority
- GB
- United Kingdom
- Prior art keywords
- composite body
- body according
- tin
- thickness
- coating
- 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
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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/08—Tin or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
- Coating With Molten Metal (AREA)
- Paints Or Removers (AREA)
Abstract
A composite body comprising a stainless steel substrate provided with a tin based alloy coating applied by a hot dip process, the coating having a thickness in the range of 7 x 10<-3> mm to 2.5mm. The tin based alloy may comprise at least 90% tin by weight and not greater than 0.1% lead by weight. The composite body may be provided with a surface formed from an asphalt-based paint.
Description
Coated Substrate
The present invention is concerned with coated substrates, and in particular to a stainless steel substrate provided with a tin based coating.
Stainless steel is not usually provided with a protective coating, because of its inherent resistance to corrosion. Attempts have, however, been made to provide stainless steel with a tin coating by electroplating or hot dip processes. Neither of these techniques have proved to be very successful.
Electroplating of stainless steel involves the use of expensive materials and complex apparatus. A stainless steel strip is initially run through a stannous solution and an electric current introduced into the solution. The tin is reduced and plated onto the stainless steel strip. The thickness of the tin plate is restricted to not more than about 2 micrometres (about 8 x 10-5 in), with a view to minimising costs.
The usefulness of such tin-plated products is significantly curtailed, as is seen when the products are used in harsh environments, such as salt water and acidic conditions, where tin coatings of greater thickness would be advantageous.
Conventional hot-dip processes have repeatedly proved to be unsuccessful, because the resultant tin coating flakes off the stainless steel soon after coating, and/or during pre-forming and installation. A further disadvantage associated with hot-dipping is the formation of discontinuities in the tin coating, which renders the coated product unsuitable for use as food containers or the like.
Tin alloy coating of stainless steel by a hot-dipped process has proved to be somewhat more successful. One of the most commonly used tin alloy coatings is a tin-lead alloy known as terne. The composition of terne is about 80% lead (by weight) and 20% tin (by weight). The lead in the terne alloy readily bonds to stainless steel to form a durable coating.
There has, however been considerable concern regarding the use of coating materials having such a high lead content. In particular, potential leaching of the lead from the terne alloy has precluded its use in applications such as aquifer roofing systems.
We have now developed a stainless steel coated product, which helps to alleviate the above problems.
According to the present invention, there is provided a composite body comprising a stainless steel substrate which has thereon a tin based alloy coating, applied by a hot dip process, the coating having a thickness in the range of 7 x 103mum to 2.5mm (0.0003 to 0.1 in), more preferably up to 1.3 mm (0.05mm).
The above-mentioned thickness range of 7 x 103 to 2.5mm is significantly thicker than thicknesses achievable by electroplating. An especially preferred coating thickness is in the range of 2 x 10.2 to 5 x 102mm (0.001 to 0.002 in). The greater thicknesses of coatings achieved by the present invention increases the life of the alloy coated stainless steel products.
It is preferred that the stainless steel substrate comprises 304 or 316 stainless steel strip, although it is envisaged that other types of stainless steel may be used, generally in strip form. Preferably the substrate is of thickness not greater than about Smm (0.2 in), and advantageously is about 1.3mm (0.05 in) thickness.
In one embodiment of the invention the composite body, according to the invention, is prepared by the method outlined in parent application GB9305652. 1 (specification number 2265389).
It is preferred that the tin based alloy comprises at least 90% tin (by weight) and not greater than 0.1% lead (by weight). A preferred tin based alloy composition by percentage weight is as follows:
Tin 90-99.9% Lead 0.01 - 0.10% Bismuth 0.0 -1.7% Antimony 0.0 - 7.5 % Zinc 0.00- 1.5%
Iron 0.00 - 0. 1% Copper 0.00 - 2.7%
Bismuth and antimony can enhance the abrasion resistant properties of the alloy coating20ihe presence of these elements is also advantageous in obviating flaking of the coating due to crystallisation of the tin on cooling. The alloy may further include small amounts of titanium and nickel as strengthening agents.
According to a preferred aspect of the invention the composite body further comprises a weathering agent to accelerate the weathering and discolouration of the alloy coating. The weathering agent is typically an asphalt-based paint which causes accelerated weathering of the coating when exposed to the atmosphere. Typically, the asphalt paint is a petroleum-based paint comprising asphalt, titanium oxide, inert silicates, low-clay carbon black or other free carbon and an anti-settling agent.
The asphalt-based paint is generally applied as a relatively thin layer, of about 0.25 to 5 mils, typically 1-2 mils thickness, so as to form a transparent or translucent layer over the coating.
There is further provided by the present invention a roofing material comprising a composite body as described above.
Claims (8)
1. A composite body comprising a stainless steel substrate, provided with a tin based
alloy coating, said coating having a thickness in the range of 7 x 10- to 2.5mm and
having been applied to said substrate by a hot-dip process.
2. A composite body according to claim 1, wherein said coating has a thickness in the
range of 2 x 10- to 5 x 10-mm.
3. A composite body according to claim 1 or 2, wherein said substrate is of thickness
not greater than about Smm.
4. A composite body according to any of claims 1 to 3, wherein said tin based alloy
comprises at least 90% tin by weight and not greater than 0.1% lead by weight.
5. A composite body according to any of claims 1 to 4, having a composition by
percentage weight of
Tin 90-99.9% Lead 0.01 - 0.10% Bismuth 0.0 -1.7% Antimony 0.0 - 7.5% Zinc 0.00- 1.5%
Iron 0.00- 0.1% Copper 0.00 - 2.7%
6. A composite body according to any of claims 1 to 5, which has a surface covering
comprising an asphalt-based paint.
7. A composite body according to claim 6, wherein said paint is petroleum-based.
8. A composite body according to any of claims 1 to 7, which is in the form of a
roofing material.
8. A composite body according to claim 6 or 7, wherein said surface covering has a
thickness of about 0.25 to 5 mils.
9. A composite body according to any of claims 1 to 8, which is in the form of a
roofing material.
Amendments to the claims have been filed as follows 1. A composite body comprising a stainless steel substrate, having thereon a tin based
alloy coating comprising at least 90% tin by weight and not greater than 0.1% lead
by weight, said coating having a thickness in the range of 7 x 10- to 2.5mm and
having been applied to said substrate by a hot-dip process.
2. A composite body according to claim 1, wherein said coating has a thickness in the
range of 2 x 10- to 5 x 10-mm.
3. A composite body according to claim 1 or 2, wherein said substrate is of thickness
not greater than about Smm.
4. A composite body according to any of claims 1 to 3, having a composition by
percentage weight of
Tin 90 - 99.9% Lead 0.01 - 0.10% Bismuth 0.0 -1.7% Antimony 0.0 - 7.5% Zinc 0.00- 1.5% Iron 0.00 - 0.1% Copper 0.00 - 2.7% 5. A composite body according to any of claims 1 to 4, which has a surface covering
comprising an asphalt-based paint.
6. A composite body according to claim 5, wherein said paint is petroleum-based.
7. A composite body according to claim 5 or 6, wherein said surface covering has a
thickness of about 0.25 to 5 mils.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/858,662 US5314758A (en) | 1992-03-27 | 1992-03-27 | Hot dip terne coated roofing material |
| US10193A | 1993-01-04 | 1993-01-04 | |
| GB9305652A GB2265389B (en) | 1992-03-27 | 1993-03-18 | Coated substrate |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9510952D0 GB9510952D0 (en) | 1995-07-26 |
| GB2288410A true GB2288410A (en) | 1995-10-18 |
| GB2288410B GB2288410B (en) | 1996-01-17 |
Family
ID=27266628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9510952A Expired - Lifetime GB2288410B (en) | 1992-03-27 | 1993-03-18 | Coated substrate |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2288410B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6652990B2 (en) | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
| US6794060B2 (en) | 1992-03-27 | 2004-09-21 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB626826A (en) * | 1947-09-03 | 1949-07-21 | Glacier Co Ltd | Improvements in the production of composite metallic strip |
| GB709163A (en) * | 1952-05-29 | 1954-05-19 | Whitfield & Sheshunoff Inc | Improvements in and relating to method and apparatus for the formation of hot dip coating |
| GB796128A (en) * | 1956-12-13 | 1958-06-04 | Husqvarna Vapenfabriks Ab | Sintered metal objects and the manufacture thereof |
| FR1457769A (en) * | 1964-10-13 | 1966-01-24 | United States Steel Corp | Advanced process for making tinplate |
| JPS4218219B1 (en) * | 1965-05-12 | 1967-09-20 | ||
| GB1143107A (en) * | 1965-04-30 | 1969-02-19 | Yawata Iron & Steel Co | Molten alloy plating bath for surface coating of iron and steel articles |
| GB1361942A (en) * | 1971-05-10 | 1974-07-30 | Usui Kokusai Sangyo Kk | Corrosion-resistant double-coated steel material |
| EP0012437A1 (en) * | 1978-12-14 | 1980-06-25 | Ahi Operations Limited | Improvements in or relating to methods of forming coatings, coatings so formed and articles coated thereby |
| GB2055158A (en) * | 1979-06-18 | 1981-02-25 | Gould Inc | Bearing material and method of making |
| GB2055402A (en) * | 1979-08-03 | 1981-03-04 | Youdelis William Vincent | Coating metallic substrates with gold alloy |
| GB1588808A (en) * | 1976-10-01 | 1981-04-29 | Dreulle N | Zinc alloy and galvanisation process |
| GB2087931A (en) * | 1980-11-21 | 1982-06-03 | Emmelot Galvanisch Bv | Coating Cast iron with Liquid Metal |
| GB2117414A (en) * | 1982-03-26 | 1983-10-12 | Usui Kokusai Sangyo Kk | Ferrous substrates hot dip coated with lead alloy |
| EP0261078A1 (en) * | 1986-09-10 | 1988-03-23 | Battelle Memorial Institute | Process for selectively forming at least one metal or alloy coating strip on a substrate of another metal and integrated circuit lead frame achieved by this process |
-
1993
- 1993-03-18 GB GB9510952A patent/GB2288410B/en not_active Expired - Lifetime
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB626826A (en) * | 1947-09-03 | 1949-07-21 | Glacier Co Ltd | Improvements in the production of composite metallic strip |
| GB709163A (en) * | 1952-05-29 | 1954-05-19 | Whitfield & Sheshunoff Inc | Improvements in and relating to method and apparatus for the formation of hot dip coating |
| GB796128A (en) * | 1956-12-13 | 1958-06-04 | Husqvarna Vapenfabriks Ab | Sintered metal objects and the manufacture thereof |
| FR1457769A (en) * | 1964-10-13 | 1966-01-24 | United States Steel Corp | Advanced process for making tinplate |
| GB1143107A (en) * | 1965-04-30 | 1969-02-19 | Yawata Iron & Steel Co | Molten alloy plating bath for surface coating of iron and steel articles |
| JPS4218219B1 (en) * | 1965-05-12 | 1967-09-20 | ||
| GB1361942A (en) * | 1971-05-10 | 1974-07-30 | Usui Kokusai Sangyo Kk | Corrosion-resistant double-coated steel material |
| GB1588808A (en) * | 1976-10-01 | 1981-04-29 | Dreulle N | Zinc alloy and galvanisation process |
| EP0012437A1 (en) * | 1978-12-14 | 1980-06-25 | Ahi Operations Limited | Improvements in or relating to methods of forming coatings, coatings so formed and articles coated thereby |
| GB2055158A (en) * | 1979-06-18 | 1981-02-25 | Gould Inc | Bearing material and method of making |
| GB2055402A (en) * | 1979-08-03 | 1981-03-04 | Youdelis William Vincent | Coating metallic substrates with gold alloy |
| GB2087931A (en) * | 1980-11-21 | 1982-06-03 | Emmelot Galvanisch Bv | Coating Cast iron with Liquid Metal |
| GB2117414A (en) * | 1982-03-26 | 1983-10-12 | Usui Kokusai Sangyo Kk | Ferrous substrates hot dip coated with lead alloy |
| EP0261078A1 (en) * | 1986-09-10 | 1988-03-23 | Battelle Memorial Institute | Process for selectively forming at least one metal or alloy coating strip on a substrate of another metal and integrated circuit lead frame achieved by this process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2288410B (en) | 1996-01-17 |
| GB9510952D0 (en) | 1995-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20130317 |