Patent ID: 6346186
Filing Date: 2002-02-12
Classification: C25D,F16L

Abstract:
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 PO43âˆ’/l 0 to 100 g NO3âˆ’/l 0 to 100 g ClO3âˆ’/l and 0 to 50 g Fâˆ’ or Clâˆ’/l with the ratio of Ca++/Zn++ being larger than 1, and where the temperature of the solution is between 0 and 95Â° 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.