Chemical polishing solution for titanium and titanium alloy

A chemical polishing and titanium alloy technology, applied in the field of chemical polishing solutions, can solve the problems of difficult control of solubility, difference in etching rate, and easy hydrogen absorption on the surface, so as to achieve easy control of reaction speed, reduce difference in etching rate, and good surface quality Effect

Inactive Publication Date: 2011-05-11
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since hydrofluoric acid has a relatively strong corrosion effect on titanium, the direct configuration of the solution reacts violently, and the solubility is not easy to control, which often causes corrosion damage to the titanium metal substrate and hydrogen absorption on the surface.
Especially for multi-phase titanium alloys, due to the difference in the etching rate between different phases or between grains and grains on the microscopic surface of the alloy material, the current chemical polishing liquid has a poor surface smoothing effect, and the corrosion between different phases or between grains and grains is not good. Etching difference sometimes reaches more than 5μm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare the chemical polishing solution with the following components:

[0016] Ammonium fluoride content: 60g / L;

[0017] The volume ratio of lactic acid (content is 85-90%): 91%;

[0018] The volume ratio of nitric acid (content is 65-68%): 9%.

[0019] The pure titanium plate with a size of 20mm×20mm×3mm was used as the experimental sample, and the surface roughness was 2.1-1.8μm. First, the prepared pure titanium metal sample was degreased (solution: 40g / L NaOH, 45g / L NaOH 3 PO 4 , 30g / L Na 2 CO 3 , temperature 75°C, time 10min), rinse with clean water, etc., and then immerse the sample in the above chemical polishing solution. At room temperature (15°C), take out the sample after 6 minutes and 12 minutes, wash it with water, and then dry it. After polishing the samples, the surfaces of the obtained two samples were smooth, silver-gray, bright, and no intergranular or grain-shaped appearance appeared.

[0020] The average corrosion depth of the sample taken ou...

Embodiment 2

[0022] Prepare the chemical polishing solution with the following components:

[0023] Ammonium fluoride content: 160g / L;

[0024] The volume ratio of lactic acid (content is 85-90%): 80%;

[0025] The volume ratio of nitric acid (content is 65-68%): 20%.

[0026] The Ti-6Al-4V titanium alloy rod with a size of φ15mm×30mm was used as the experimental sample, and the surface roughness was 2.5-2.0μm. First, the prepared titanium alloy metal sample was degreased (solution: 40g / L NaOH, 45g / L Na 3 PO 4 , 30g / L Na 2 CO 3 , temperature 75°C, time 10min), rinse with clean water, etc., and then immerse the sample in the above chemical polishing solution. At room temperature (25°C), take out the sample after 3 minutes and 8 minutes, wash it with water, and then dry it. After polishing the sample, the two samples obtained have smooth and flat surfaces, appearing mirror-like, silvery white, with excellent luster, and no intergranular or grain-shaped appearance.

[0027] The averag...

Embodiment 3

[0029] Prepare the chemical polishing solution with the following components:

[0030] Ammonium fluoride content: 300g / L;

[0031] The volume ratio of lactic acid (content is 85-90%): 65%;

[0032] The volume ratio of nitric acid (content is 65-68%): 35%.

[0033] Taking 20mm×20mm×3mm Ti-6Al-4V titanium alloy as the experimental sample, the surface roughness is 2.8-2.1μm, the prepared titanium alloy metal sample is degreased first (solution: 40g / L NaOH, 45g / L Na 3 PO 4 , 30g / L Na 2 CO 3 , temperature 75°C, time 10min), rinse with clean water, etc., and then immerse the sample in the above chemical polishing solution. At room temperature (35°C), take out the sample after 2 minutes and 12 minutes, wash it with water, and then dry it. After polishing the samples, the two samples obtained have smooth surfaces, silvery white, high brightness, and no intergranular or grain-shaped appearance.

[0034] The average corrosion depth of the sample taken out in 2 minutes was 26.8 μm...

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Abstract

The invention relates to chemical polishing solution for titanium and titanium alloy, and belongs to a chemical formula. The chemical polishing solution consists of ammonium fluoride, lactic acid, nitric acid and water, wherein the content of the ammonium fluoride is 60 to 300g/L, the volume ratio of the lactic acid (the content is 85 to 90 percent) is 65 to 91 percent, and the volume ratio of the nitric acid (the content is 65 to 68 percent) is 9 to 35 percent. The solution has the characteristics that the reaction velocity is easy to control, the etching rate difference between different phases or between grains can be reduced, the titanium metal matrix is effectively protected, and the like. The chemical polishing solution for the titanium and the titanium alloy is simple and convenience and has the advantages of high efficiency, low cost, good surface quality and the like.

Description

technical field [0001] The invention relates to a chemical polishing solution for titanium and titanium alloy, belonging to a chemical formula. Background technique [0002] Titanium and titanium alloy metals have the characteristics of light weight, high strength, excellent corrosion resistance, and no allergies to human skin, so they are widely used in various fields. Titanium and titanium alloys have high relative strength (tensile strength / density), high tensile strength, fatigue resistance, impact resistance and high heat resistance in terms of mechanical properties, so they are widely used in aerospace industry, sports equipment, Bicycle parts, golf heads, glasses and many other civilian products. Secondly, titanium and its alloys will not cause allergic reactions to human skin, so they can replace nickel or nickel alloy products that have caused skin itching or dermatitis in the past. In addition, titanium and titanium alloys can be used in medical equipment, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F3/06
Inventor 温军国郑弃非
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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