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Method for coating a metal strip
| Details |
Inventors: Carey, II, Jay F.; Zamanzadeh, Mehrooz;
Assignee: The Louis Berkman Company (Steubenville, OH)
Primary Examiner: Utech; Benjamin
Assistant Examiner:
Attorney, Agent or Firm: Vickers, Daniels & Young
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. |
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DETAILED DESCRIPTION The present invention relates to a product and method of producing a corrosion-resistant, environmentally friendly metal material.
More specifically, the invention relates to the coating of metal strip with a coating having a low lead content, indeed being essentially lead free, and forms a corrosive-resistant barrier on the coated strip.
In accordance with the principal feature of the invention, there is provided a metal strip of stainless steel, carbon steel or copper coated with a corrosion-resistant metal alloy.
Preferably, the metal coating alloy is an alloy primarily including tin for a single phase alloy system or primarily including tin and zinc for a two-phase alloy system.
Other metal strip compositions which have been coated include metal strip made of nickel alloys, aluminum, titanium and bronze.
"Stainless steel" in the application is used in its technical sense and includes a large variety of alloy metals containing chromium and iron.
Chromium plated ferrous materials are also stainless steel.
During hot-dipping, the plated chromium softens and intermingles with the ferrous strip to form a ferrous-chromium alloy.
The stainless steel may also contain other elements such as nickel, carbon, molybdenum, silicon, manganese, titanium, boron, copper, aluminum and various other metals or compounds.
Elements such as nickel can be flashed (electroplated) onto the surface of the chromium-iron alloy or directly incorporated into the chromium-iron alloy, i.
e.
the stainless steel.
In accordance with another aspect of the present invention, the metal strip is plated, metal spayed or hot dipped with an intermediate metal barrier prior to applying the metal alloy coating to the strip surface.
The intermediate metal barrier provides additional corrosion resistance, especially against halogens such as chlorine.
The metal barrier preferably is tin, nickel, copper or chromium.
Other metals such as aluminum, cobalt, molybedum, Sn--Ni or Fe--Ni are also used.
The metal barrier is applied to the metal strip to form a very thin metal layer
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