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

Abstract

A method for producing an adhesion promoting layer on a surface of a titanium material involves introducing the surface into an aqueous alkaline solution of 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. A voltage is applied between the solution and the titanium material for a predefined period of time, in order to produce the layer by anodic oxidation of the surface.

1 - 13 . (canceled) 
     
     
         14 . 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.   
     
     
         15 . The method of  claim 14 , wherein the sodium hydroxide is present at a concentration in a range from 150 to 285 g/l. 
     
     
         16 . The method of  claim 15 , wherein the sodium hydroxide is present at a concentration in a range from 175 to 270 g/l, 195 to 250 g/l, 210 to 240 g/l, or 238 to 242 g/l. 
     
     
         17 . The method of  claim 16 , wherein the sodium hydroxide is present at a concentration of 240 g/l. 
     
     
         18 . The method of  claim 14 , wherein the sodium tartrate is present at a concentration in a range from 20 to 200 g/l. 
     
     
         19 . The method of  claim 18 , wherein the sodium tartrate is present at a concentration in a range from 60 to 140 g/l, 75 to 125 g/l, 85 to 110 g/l, or 90 to 105 g/l. 
     
     
         20 . The method of  claim 19 , wherein the sodium tartrate is present at a concentration of 100 g/l. 
     
     
         21 . The method of  claim 14 , wherein the methyl glycine diacetic acid trisodium is present at a concentration in a range from 10 to 50 g/l. 
     
     
         22 . The method of  claim 21 , wherein the methyl glycine diacetic acid trisodium is present at a concentration in a range from 15 to 40 g/l, 20 to 35 g/l, 25 to 33 g/l, or 28 to 32 g/l. 
     
     
         23 . The method of  claim 22 , wherein the methyl glycine diacetic acid trisodium is present at a concentration of 30 g/l. 
     
     
         24 . The method of  claim 14 , wherein the pentasodium triphosphate is present at a concentration of 3 to 17 g/l. 
     
     
         25 . The method of  claim 24 , wherein the pentasodium triphosphate is present at a concentration of 4.5 to 13 g/l, or 6 to 10 g/l, or 7 to 8 g/l. 
     
     
         26 . The method of  claim 25 , wherein the pentasodium triphosphate is present at a concentration of 7.5 g/l. 
     
     
         27 . The method of  claim 14 , wherein the anodic oxidation is carried out with a voltage in a range from 2 to 50 V. 
     
     
         28 . The method of  claim 27 , wherein the anodic oxidation is carried out with a voltage in a range from 3 to 45 V, 5 to 35 V, 7 to 25 V, 9 to 20 V, 9 to 15 V, or 10 to 12 V. 
     
     
         29 . The method of  claim 28 , wherein the anodic oxidation is carried out with a voltage of 10 V. 
     
     
         30 . The method of  claim 14 , wherein the anodic oxidation is carried out for a period of time in a range from 5 to 60 min. 
     
     
         31 . The method of  claim 30 , wherein the anodic oxidation is carried out for a period of time in a range from 8 to 50 min., 11 to 40 min., 15 to 30 min., 18 to 25 min., or 19 to 22 min. 
     
     
         32 . The method of  claim 31 , wherein the anodic oxidation is carried out for a period of time of 20 min. 
     
     
         33 . The method of  claim 14 , wherein the anodic oxidation is carried out at a maximum current density in a range from 0.2 to 10 A/dm 2 . 
     
     
         34 . The method of  claim 33 , wherein the anodic oxidation is carried out at a maximum current density in a range from 0.4 to 8 A/dm 2 , 0.6 to 4 A/dm 2 , 0.8 to 2 A/dm 2 , 1.0 to 1.5 A/dm 2 , or 1.1 to 1.3 A/dm 2 . 
     
     
         35 . The method of  claim 34 , wherein the anodic oxidation is carried out at a maximum current density of 1.2 A/dm 2 . 
     
     
         36 . The method of  claim 14 , wherein the anodic oxidation is carried out at a temperature in a range from 5 to 60° C. 
     
     
         37 . The method of  claim 36 , wherein the anodic oxidation is carried out at a temperature in a range from 10 to 50° C., 15 to 40° C., 20 to 35° C., 25 to 33° C., or 28 to 32° C. 
     
     
         38 . The method of  claim 37 , wherein the anodic oxidation is carried out at a temperature of 30° C. 
     
     
         39 . The method of  claim 14 , wherein the anodic oxidation of the surface is carried out in the alkaline solution while generating an oxide layer having a layer thickness in a range from 50 to 600 nm. 
     
     
         40 . The method of  claim 39 , wherein the anodic oxidation of the surface is carried out in the alkaline solution while generating an oxide layer having a layer thickness in a range from 70 to 400 nm or 100 to 250 nm. 
     
     
         41 . The method of  claim 40 , wherein the anodic oxidation of the surface is carried out in the alkaline solution while generating an oxide layer having a layer thickness of 150 nm. 
     
     
         42 . 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.