Process for producing an ornamental rust finish on a ferrous metal surface

  • US 5,728,236 A
  • Filed: 10/24/1995
  • Issued: 03/17/1998
  • Est. Priority Date: 10/24/1995
  • Status: Expired due to Fees
First Claim
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1. A process for producing an ornamental rust finish on a ferrous metal surface, comprising the steps of:

  • (a) applying to said ferrous metal surface an aqueous solution having ferric oxide-forming oxidizing reactivity with said ferrous metal surface, said aqueous solution comprising a copper salt and an acid in relative concentrations effective for imparting said oxidizing reactivity to said aqueous solution, said copper salt being selected from the group consisting of copper sulfate, copper nitrate and copper chloride said acid being selected from the group consisting of sulfamic acid and oxalic acid; and

    (b) oxidizing said ferrous metal surface with said aqueous solution so as to form said rust finish as an oxidation reaction product composed primarily of ferric oxide.

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