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Galvanized steel sheet protected by chromium and chromium oxide layers

  • US 4,511,633 A
  • Filed: 02/10/1984
  • Issued: 04/16/1985
  • Est. Priority Date: 03/21/1983
  • Status: Expired due to Fees
First Claim
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1. Steel sheet, protected by a zinc coating overlaid with a protective layer of chromium and hydrated oxides of chromium, the chromium metal being in the form of particles having average dimensions of about 0.03 micron, while at least 40% by volume of the metallic chromium is in the form of particles measuring less than 0.02 micron.

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