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Coated metal strip

  • US 5,489,490 A
  • Filed: 11/17/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 04/05/1993
  • Status: Expired due to Term
First Claim
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1. A coated metal strip including a base strip of steel or copper with parallel surfaces both of which are coated with a highly corrosive-resistant, homogeneous two-phase tin-zinc alloy with tin being the primary constituent and zinc forming one of said two-phases, said coating being applied by continuously passing the continuous metal strip through a bath of molten tin-zinc alloy at a speed to deposit onto said base strip an impervious two-phase layer of said tin-zinc alloy having a uniform thickness on both surfaces in the range of 0.001-0.003 inch, said two-phase tin-zinc alloy coating comprising discrete sections of zinc in a tin rich matrix, said two-phases being formed by proportioning the zinc and tin to provide about 10 to about 30 percent by weight zinc, a majority of tin and an effective amount of metallic stabilizer, which metallic stabilizer does not change the two-phase characteristic of said coating alloy deposited on the moving strip and is selected from the group consisting of antimony, bismuth and mixtures thereof.

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