METHOD FOR PASSIVATING A SURFACE OF A METAL PART

• Main Authors: GRABOWSKI, Michael, KORTE, Michael, WETZEL, Tommy, VIRTANEN, Sannakaisa, DE CASTRO LODOSA, Guillermo
• Format: Patent
• Language: English; French; German
• Published: 24.10.2018
• Subjects: APPARATUS THEREFOR; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to a method for passivating a surface (25) of a metal part (3), wherein a calcium phosphate-containing conversion coating (5) that comprises oxides and hydroxides as well as carbonates of the material from the metal part, is created on the surface (25) in a passivation step using an aqueous passivation solution. According to the invention, the passivation solution for forming the conversion coating (5) includes at least one substance that acts as a chelating agent.