Method for coating a metal strip
First Claim
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1. A method of producing a coated metal strip having a corrosive-resistant alloy comprising the steps of:
- a) selecting a metal strip formed of a given metal and having an exposed surface and a thickness of less than about 0.20 inch;
b) unrolling said metal strip from a coil of said metal strip;
c) hot dip coating said metal strip with corrosion-resistant alloy by continuously passing said strip in a longitudinal direction at a speed through a molten bath of said corrosion-resistant alloy, said molten bath having a temperature of at least about 449°
F., said speed of said metal strip controlled such that said metal strip has a residence time in said molten bath is about 0.08 to about 10 minutes to deposit a substantially uninterrupted layer of said corrosion-resistant alloy having a substantially uniform thickness of about 0.001 to about 0.05 inch onto the exposed surface of said metal strip and forming an intermetallic interface comprising an interface alloy constituting a heat created mixture of said given metal and said corrosion-resistant alloy and having a thickness of about 1 to about 10 microns, said corrosion-resistant alloy comprising at least about 90 weight percent tin and up to about 0.1 weight percent lead.
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Abstract
A corrosion-resistant metal strip and method for making the same which is essentially lead free and is not highly reflective. The coating on the metal strip is a metallic coating comprised of tin and a very low weight percentage of lead. The coating alloy may also include antimony, bismuth, copper, zinc to improve the coating process and/or improve the properties of the tin coating. A metal layer may also applied to the surface of the metal strip prior to applying the metallic alloy coating.
98 Citations
69 Claims
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1. A method of producing a coated metal strip having a corrosive-resistant alloy comprising the steps of:
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a) selecting a metal strip formed of a given metal and having an exposed surface and a thickness of less than about 0.20 inch; b) unrolling said metal strip from a coil of said metal strip; c) hot dip coating said metal strip with corrosion-resistant alloy by continuously passing said strip in a longitudinal direction at a speed through a molten bath of said corrosion-resistant alloy, said molten bath having a temperature of at least about 449°
F., said speed of said metal strip controlled such that said metal strip has a residence time in said molten bath is about 0.08 to about 10 minutes to deposit a substantially uninterrupted layer of said corrosion-resistant alloy having a substantially uniform thickness of about 0.001 to about 0.05 inch onto the exposed surface of said metal strip and forming an intermetallic interface comprising an interface alloy constituting a heat created mixture of said given metal and said corrosion-resistant alloy and having a thickness of about 1 to about 10 microns, said corrosion-resistant alloy comprising at least about 90 weight percent tin and up to about 0.1 weight percent lead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of producing a coated metal strip with a corrosive-resistant alloy comprising the steps of:
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a) selecting a strip formed of a given metal and having an exposed surface; and
,b) coating said strip with a corrosion-resistant coating by passing said strip through a molten bath of said corrosion-resistant alloy such that the residence time of said strip is sufficient to deposit a layer of said corrosion-resistant alloy onto the exposed surface of said metal strip and forming an intermetallic interface comprising an interface alloy constituting a heat created mixture of said given metal and said corrosion-resistant alloy, said corrosion-resistant alloy comprising a majority of tin and a metal additive, said metal additive selected from the group consisting of a metal stabilizer, a coloring agent, a corrosion-resistant agent and mixtures thereof. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method of producing a coated metal strip having a corrosive-resistant alloy comprising the steps of:
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a) selecting a metal strip formed of stainless steel and having a thickness of up to about 0.20 inch; b) unrolling said stainless steel strip from a coil of said stainless steel strip; c) hot dip coating said stainless steel strip with a corrosive-resistant alloy by continuously passing said stainless steel strip in a longitudinal direction at a speed through a molten bath having a temperature of at least about 449°
F., said speed of said stainless steel strip controlled such that said stainless steel strip has a residence time in said molten bath is about 0.08 to about 10 minutes to deposit a substantially uninterrupted layer of said corrosion-resistant alloy having a substantially uniform thickness of about 0.001 to about 0.05 inch onto the exposed surface of said stainless steel strip and forming an intermetallic interface comprising an interface alloy constituting a heat created mixture of said stainless steel strip and said corrosion-resistant alloy and having a thickness of about 1 to about 10 microns, said corrosion-resistant alloy comprising over 90 weight percent tin. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A method of producing a coated metal strip having a corrosion-resistant alloy comprising the steps of:
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a) selecting a metal strip formed of stainless steel and having a thickness of up to about 0.2 inch; b) unrolling said stainless steel strip from a coil of said stainless steel strip at a speed rate of up to 400 ft/min.; c) coating said stainless steel strip with a corrosion-resistant alloy to deposit a substantially uninterrupted layer of said corrosion-resistant alloy having a substantially uniform thickness of up to about 0.05 inch and forming a heat created intermetallic interface comprising an interface alloy which includes iron, chromium and tin and has a thickness of up to about 10 microns, said corrosion-resistant alloy comprising over 90 weight percent tin and a metal additive selected from the group consisting of at least an effective amount of metal stabilizer for inhibiting crystallization of said tin, at least an effective amount of corrosion-resistant agent for enhancing the corrosion-resistant properties of said corrosion-resistant alloy, at least an effective amount of coloring agent for reducing the reflectivity of said corrosion-resistant coating and mixtures thereof. - View Dependent Claims (64, 65, 66, 67, 68, 69)
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Specification