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Phosphatized and painted metal articles

  • US 4,143,205 A
  • Filed: 12/27/1977
  • Issued: 03/06/1979
  • Est. Priority Date: 10/05/1976
  • Status: Expired due to Term
First Claim
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1. A coated ferruginous substrate having on the surface thereof an adherent, corrosion-resistant and water-insoluble composite surface coating, which coating comprises a base coating on the substrate surface of a water-insoluble, complex phosphatized coating of the iron phosphate type obtained by contacting said ferruginous substrate with an organic solvent and water-containing liquid phosphatizing composition containing water in minor amount but in an amount exceeding phosphoric acid in said composition while being sufficient for said composition to provide a phosphatized coating of substantial water insolubility, said coating containing, in addition to trace elements, the elements iron, phosphorous, and oxygen plus carbon and nitrogen, and having a coating surface ratio of oxygen atoms to phosphorous atoms of at least about 4:

  • 1, and a coating surface ratio of carbon atoms to phosphorous atoms of greater than about 1.5;

    1, and on said base coating a paint topcoating from a paint topcoat composition.

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