Method for electrochemical phosphating of metal surfaces

  • US 6,346,186 B1
  • Filed: 08/07/2000
  • Issued: 02/12/2002
  • Est. Priority Date: 08/29/1996
  • Status: Expired due to Term
First Claim
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1. Method for electrochemical phosphating of metal surfaces used with cold forming of metal workpieces, comprising effecting an electrochemical phosphating through a cathodic process using an aqueous phosphating solution containing0.5 to 100 g Ca2+/l 0.5 to 100 g Zn2+/l 5 to 100 g PO43−

  • /l 0 to 100 g NO3

    /l 0 to 100 g ClO3

    /l and 0 to 50 g F

    or Cl

    /l with the ratio of Ca++/Zn++ being larger than 1, and where the temperature of the solution is between 0 and 95°

    C., the pH-value of the solution is between 0.5 and 5, and the current density is between 0.1 and 250 mA/cm2, and then applying a lubricant to the workpiece.

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