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Non-chrome passivation for metal substrates

  • US 5,294,265 A
  • Filed: 03/15/1993
  • Issued: 03/15/1994
  • Est. Priority Date: 04/02/1992
  • Status: Expired due to Term
First Claim
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1. An aqueous acidic solution for treating metal surfaces comprising:

  • a) a compound selected from the group consisting of epoxy esters of phosphoric acid, epoxy esters of a phosphonic acid and mixtures thereof,b) and a halide ion selected from the group consisting of fluoride and chloride.

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