POST-PASSIVATION OF A PHOSPHATIZED METAL SURFACE IN A CONTINUOUS PROCESS

摘要

The invention relates to a method for carrying out a post-passivation of a phosphatized metal surface in a continuous process, which is characterized by treating the phosphatized metal surface for a period of 1 to 9 seconds with an aqueous post-passivation solution that contains 50 to 5000 mg/l nickel ions and 200 to 15000 mg/l phosphate ions. Arising rinsing water that contains constituents of the post-passivation solution can be processed by nanofiltration or reverse osmosis by transferring the residue to the phosphatization bath, thereby completing the Ni cycle. The post-passivation solution preferably additionally contains a phosphatizing accelerator.