Electropolishing process for titanium

a technology of electrolysis process and titanium, which is applied in the direction of electrolysis process, electrical equipment, electrical machining apparatus, etc., can solve the problems of the use of titanium electrodes involves substantial technical and health risks, and the quality of the electrodes is not satisfactory

Inactive Publication Date: 2008-09-11
POLIGRAT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these electrolytes are indeed capable of achieving satisfactory electropolishing results on surfaces of pure titanium and a selection of titanium alloys, but they are only partially able to produce a satisfactory quality of electropolishing of Nitinol, a nickel-titanium alloy, which consists of about 50 mol.
Furthermore, all of these electrolytes have the disadvantage that their use involves substantial technical and health risks.
Thus, for the electrolyte mixture according to No. 1 there is a risk of explosion if it is handled incorrectly, whereas the other electrolytes pose a considerable health risk, in particular because of their content of fluorides.
The use of these electrolytes, and processes in which these electrolytes are used, in an industrial context requires expensive equipment an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Titanium alloy TiAlV4

[0025]A plate with the dimensions 50×50×1.0 mm with a ground surface and roughness of Ra=0.8 μm was electropolished in an electrolyte consisting of 990 g of 100% methanesulfonic acid and 10 g of 1-hydroxyethyl-1,1-diphosphonic acid.

[0026]The operating variables were as follows:

Temperature: 30° C.

[0027]Current density: 20 A / dm2

Polishing time: 7 min

Prior to the treatment, the plate was degreased, rinsed with water and dried. After electropolishing, the plate was taken out of the electrolyte and, after a waiting time of 5 min, rinsed in deionized water and dried. The surfaces had a bright finish, without etch attack, and had roughness of Ra=0.3 μm. The edges were smooth and burr-free.

example 2

Nitinol

[0028]Nitinol wire with a diameter of 0.8 mm was electropolished in an electrolyte according to Example 1.

The operating variables were as follows:

Temperature: 25° C.

[0029]Current density: 10 A / dm2

Polishing time 4 min

[0030]The wire was pretreated and posttreated according to Example 1.

[0031]The result was a bright, smooth surface without etch attack on the structure.

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Abstract

The present invention relates to a method of electrochemical polishing of surfaces of titanium or titanium-containing alloys, such as Nitinol. An electrolyte is used that comprises methanesulfonic acid and one or more alkanediphosphonic acids. These alkanediphosphonic acids can optionally be substituted with hydroxy and/or amino groups. A further aspect of the present invention relates to the use of said electrolyte for the electropolishing of titanium or titanium-containing alloys.

Description

[0001]The present invention relates to a method of electrochemical polishing of surfaces of titanium or titanium-containing alloys. This method is especially suitable for alloys that have a titanium content of at least about 50 mol. %, for example the nickel-titanium alloy Nitinol. For this, an electrolyte is used that comprises methanesulfonic acid and one or more, optionally substituted alkanediphosphonic acids. The present invention also relates to the use of said electrolyte for the electropolishing of surfaces of titanium and / or titanium-containing alloys, such as Nitinol.BACKGROUND OF THE INVENTION[0002]Electrochemical polishing or electropolishing, as well as the brightening and deburring of metal surfaces, is a process that is frequently employed in industry for treatment of the surfaces of metal workpieces and objects. This treatment is used for improving surface quality, for example by removing burrs from edges and surfaces, by smoothing, cleaning and brightening, both for...

Claims

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Application Information

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IPC IPC(8): C25F3/18
CPCC25F3/26
Inventor BOHME, OLAFPIESSLINGER-SCHWEIGER, SIEGFRIED
Owner POLIGRAT GMBH
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