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Corrosion resistant metal composite with metallic undercoat and chromium topcoat

  • US 4,537,837 A
  • Filed: 02/13/1984
  • Issued: 08/27/1985
  • Est. Priority Date: 03/16/1983
  • Status: Expired due to Term
First Claim
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1. A coated metal substrate having enhanced corrosion resistance and protected by a coating composite comprising a thin metallic undercoating layer of a metal combination having at least one metal selected from the group consisting of zinc, nickel, iron, chromium, aluminum and cobalt, and a substantially resin-free topcoat layer from a hexavalent-chromium-containing bonding coating composition heat-curable to a water resistant protective coating, said topcoat layer containing particulate metal as well as above 20 milligrams per square foot of coated metallic undercoating of chromium, as chromium, in non-elemental form, said composition containing hexavalent-chromium-providing-substance in liquid medium.

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