Method for producing a steel product having a Zn coating and a tribologically active layer deposited on the coating, and a steel product produced according to this method

摘要

The present invention relates to a method that makes it possible to produce a tribologically optimally effective coating on a steel product surface with a Zn-based protective coating using a simple product that is harmless with respect to environmental pollution. For this purpose, a correspondingly coated flat steel product is provided, and an aqueous solution consisting of ammonium sulfate and complete demineralized water is deposited on the protective coating of the steel product. The concentration of ammonium sulfate in the aqueous solution is 0.01 to 5.7 mol / l, and the pH value of the aqueous solution is 4 to 6 with respect to SO42- ions. At the same time, the reaction time near the surface between the aqueous solution and the protective coating is greater than 0 seconds and up to 5 seconds, and from zinc ammonium sulfate on the protective coating after the drying process performed without using the upstream flushing process. A tribologically active layer is provided.