Process for the production of sprayed phosphate coats on iron and steel

  • US 4,003,761 A
  • Filed: 04/02/1975
  • Issued: 01/18/1977
  • Est. Priority Date: 04/13/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for forming a phosphate coating on a corrodible ferric surface, thereby rendering said surface corrosion resistant which comprises spraying said surface for 0.5 to 5 minutes with a solution having a pH of 4.3 to 6.5 consisting essentially of 1 to 20 g./liter of an orthophosphate salt of a cation selected from the group consisting of alkali metals and ammonium, 0.05 to 5 g./liter of an oxidizing agent or reducing agent accelerator, 0.05 to 1 g./liter of a short-chain alkylolamine having from 2 to 4 carbon atoms in each alkylol group from 0.01 to 1.5 g./liter of at least one non-ionic wetting agent and the remainder water at a temperature in the range of about 40°

  • to 95°


View all claims

    Thank you for your feedback