Process for Producing an Adhesion-Promoting Layer on a Surface of a Titanium Material

A method for producing an adhesion promoting layer on a surface of a titanium material, the method comprising:

• introducing the surface into an aqueous alkaline solution comprising sodium hydroxide at a concentration in a range from 100 to 300 g/l, sodium tartrate at a concentration in a range from 20 to 200 g/l, methyl glycine diacetic acid trisodium at a concentration in a range from 5 g/l to 60 g/l, and pentasodium triphosphate at a concentration in a range from 2 g/l to 20 g/l;
• and
• applying a voltage between the solution and the titanium material for a predefined period of time, in order to produce the adhesion promoting layer by anodic oxidation of the surface.

An adhesion promoting layer on a surface of a titanium material, the adhesion promoting layer being producible or produced by introducing the surface into an aqueous alkaline solution comprising sodium hydroxide at a concentration in a range from 100 to 300 g/l, sodium tartrate at a concentration in a range from 20 to 200 g/l, methyl glycine diacetic acid trisodium at a concentration in a range from 5 g/l to 60 g/l, and pentasodium triphosphate at a concentration in a range from 2 g/l to 20 g/l and applying a voltage between the solution and the titanium material for a predefined period of time, in order to produce the adhesion promoting layer by anodic oxidation of the surface, wherein the adhesion promoting layer has a porous nanostructure with adjacent protrusions with undercuts as well as an interference color.