Claims
- 1. A highly corrosive resistant roof system which can be easily formed into complex shapes used for the collection of potable water, comprising a copper roofing material coated with a highly corrosive resistant metal alloy material, said metal alloy material having a low lead formulation and includes at least 0.05 weight percent metallic stabilizing agent, said metal alloy material consisting of:
- ______________________________________Tin 90.0 - 99.95Lead 0.001 - 0.1Bismuth 0.0 - 1.7Antimony 0.0 - 7.2Zinc 0.0 - 0.5Iron 0.0 - 0.1Copper 0.0 - 2.7______________________________________
- 2. A coated copper roofing material as in claim 1, wherein said metallic stabilizer is selected from the group consisting of bismuth and antimony.
- 3. A coated copper roofing material as in claim 1, wherein said lead is not more than 0.01 weight percent.
- 4. A highly corrosive resistant roof system which can be easily formed into complex shapes used for the collection of potable water comprising of a copper roofing material coated with a highly corrosive resistant metal alloy material, said metal alloy having a low lead formulation and includes at least 0.05 weight percent metallic stabilizer, said metallic alloy comprises of the following weight percentages:
- ______________________________________Tin 90.0 - 99.95Lead 0.001 - 0.1Bismuth 0.0 - 1.7Antimony 0.0 - 7.2Zinc 0.0 - 0.5Iron 0.0 - 0.1Copper 0.0 - 2.7.______________________________________
- 5. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Bismuth .ltoreq.1.7%Antimony .ltoreq.0.5%Zinc .ltoreq.0.001%Lead .ltoreq.0.02%Tin Balance.______________________________________
- 6. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Bismuth .ltoreq.0.5%Antimony .ltoreq.0.75%Zinc .ltoreq.0.5%Lead .ltoreq.0.05%Iron .ltoreq.0.01%Tin Balance.______________________________________
- 7. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Antimony .ltoreq.7.2%Copper .ltoreq.2.7%Tin Balance.______________________________________
- 8. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Antimony .ltoreq.2.5%Copper .ltoreq.2.0%Zinc .ltoreq.0.5%Tin Balance.______________________________________
- 9. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Bismuth .ltoreq.0.5%Antimony .ltoreq.0.75%Zinc .ltoreq.0.5%Tin Balance.______________________________________
- 10. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Bismuth .ltoreq.0.5%Antimony .ltoreq.1.0%Iron .ltoreq.0.1%Tin Balance.______________________________________
- 11. A coated copper roofing material as in claim 4, wherein said metal coating consisting essentially of the following weight percentages:
- ______________________________________Bismuth .ltoreq.0.5%Iron .ltoreq.0.1%Tin Balance.______________________________________
- 12. In a metal roof forming system comprising preformed pans of copper sheet metal abutted together and bent over one another at their edges to form water-proof seams, said improvement comprising: a copper sheet coated on both sides with a corrosive resistant metal coating prior to forming said water-proof seams, said metal coating comprising more than 90 weight percent tin, 0.001-0.1 weight percent lead and at least 0.05 weight percentage stabilizing agent.
- 13. A roof forming system as defined in claim 12, wherein said metallic coating (weight percent) comprises:
- ______________________________________Tin 90.0 - 99.95%Lead 0.001 - 0.05%Bismuth 0.0 - 1.7%Antimony 0.0 - 7.5%______________________________________
- 14. A roof forming system as defined in claim 13, wherein said metallic coating contains 95.0-99.95 weight percent tin.
INCORPORATED BY REFERENCE
This is a continuation of application Ser. No. 967,407, filed Oct. 26, 1992, now abandoned, which is a continuation-in-part application of my pending U.S. patent application, Ser. No. 913,209 filed Jul. 15, 1992, now abandoned, entitled "Hot Dip Low Lead Terne Coated Roofing Material."
This invention relates generally to the art of metal roofing systems that are corrosion resistant in a variety of climates and can be used to collect potable water for human consumption.
This invention is particularly applicable to a metal roofing system made of copper preformed sheets coated on both sides with a corrosion resistant metal coating formulation containing tin and very low levels of lead.
As background material so that the specification need not specify in detail what is known in the art, Federal Specification No. QQ-T-201F and an article entitled "The Making, Shaping and Treating of Steel", U.S. Steel Corporation, 1957, pp. 655-659, Sci. Lib. Coll No. TN T30 C16, 1957 are incorporated herein by reference and made part hereof. Similarly, assignee's U.S. Pat. Nos. 4,987,716 and 4,934,120 illustrate metal roofing systems of the type to which this invention relates and are incorporated herein by reference.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
2713196 |
Oct 1978 |
DEX |
42-18219 |
Sep 1967 |
JPX |
546179 |
Jan 1942 |
GBX |
796128 |
Dec 1956 |
GBX |
1513002 |
Jul 1975 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
967407 |
Oct 1992 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
913209 |
Jul 1992 |
|