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Bath composition for electropolishing of titanium and method for using same

A technology of electrolytic polishing and electrolyte, which is applied in the field of electrolyte composition, and can solve the problem that the metal surface polishing is not optimal

Inactive Publication Date: 2005-12-07
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the quality of action of these electrolytes is a compromise and the finish of the metal surfaces treated is not optimal

Method used

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Examples

Experimental program
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Effect test

specific Embodiment

[0023] A specific example of the above composition without additives is as follows:

[0024] - sulfuric acid: 98% solution; density 1.84; 25% by volume;

[0025] - hydrofluoric acid: 40% solution; density 1.10; 15% by volume;

[0026] - Glacial acetic acid: 100% solution; density 1.05; 60% by volume.

[0027] Roughness measurements carried out on unalloyed titanium metal surfaces before and after electropolishing gave the following results (Rt = maximum roughness; Ra = average roughness):

[0028] Before polishing

[0029] (Rolled surface): Rt = 1.80 microns, Ra = 0.176 microns

[0030] After polishing (dissolved metal thickness = 22 microns)

[0031] Rt=0.670 microns, Ra=0.080 microns

[0032] After polishing (dissolved metal thickness = 59 microns)

[0033] Rt=0.396 microns, Ra=0.057 microns

[0034] After polishing (dissolved metal thickness = 116 microns)

[0035] Rt=0.432 microns, Ra=0.080 microns

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PUM

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Abstract

The invention concerns a bath composition for electropolishing of a non-alloyed titanium metal surface, characterised in that it comprises: sulphuric acid (95 to 98 % solution): 20 to 40 % in volume; hydrofluoric acid (40 to 48 % solution): 10 to 18 % in volume; acetic acid ( 90 to 100 % solution): 42 to 62 % in volume, capable of modifying the electrochemical balances at the solution-metal interface, the acetic acid enabling a better control of oxidation and dissolution of the titanium surface and to automatically limit the chemical dissolution of the metal surface.

Description

technical field [0001] The present invention relates to an electrolyte composition for the electropolishing of metal surfaces made of unalloyed titanium, and to methods of using this electrolyte. Background technique [0002] The term "polishing" is understood to mean a treatment which is carried out in order to reduce the roughness of a metal surface and thus increase its brightness and thus make it less susceptible to corrosion. [0003] In addition to mechanical methods for this purpose (such as abrasive powders for particle size reduction, finishing, honing, etc.), there are also techniques that rely on the use of chemical and / or electrolytic reactions. Therefore, when the reaction that takes place does not depend on an external current source, the technique is called "chemical polishing", and when the reaction is dependent on an external current source, one of the electrodes (generally connected to the positive pole of the current source) consists of the workpiece to be...

Claims

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Application Information

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IPC IPC(8): C25F3/26
CPCC25F3/26
Inventor J·古尔林
Owner EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
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