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1. (WO2017153036) METHOD FOR PASSIVATING A SURFACE OF A METAL PART

Pub. No.:    WO/2017/153036    International Application No.:    PCT/EP2017/000240
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Feb 21 00:59:59 CET 2017
IPC: C23C 22/22
C25D 13/20
C23C 22/68
Applicants: AUDI AG
FRIEDRICH-ALEXANDER UNIVERSITÄT ERLANGEN-NÜRNBERG INI.FAU
Inventors: GRABOWSKI, Michael
WETZEL, Tommy
KORTE, Michael
DE CASTRO LODOSA, Guillermo
VIRTANEN, Sannakaisa
Title: METHOD FOR PASSIVATING A SURFACE OF A METAL PART
Abstract:
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.