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Weldable, coated metal substrates and methods for preparing and inhibiting corrosion of the same

  • US 6,440,580 B1
  • Filed: 12/01/1998
  • Issued: 08/27/2002
  • Est. Priority Date: 12/01/1998
  • Status: Expired due to Fees
First Claim
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1. A weldable, coated metal substrate comprising:

  • (a) a bare metal substrate;

    (b) a pretreatment coating having less than 0.05 weight percent of chromium-containing materials, the pretreatment coating comprising a β

    -hydroxy phosphorous ester that is the reaction product of at least one epoxy-functional material and a phosphorus-containing material deposited upon at least a portion of a surface of the metal substrate; and

    (c) a weldable coating comprising an electroconductive pigment and a binder deposited upon at least a portion of the pretreatment coating.

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