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Chemical milling solution for pure titanium, titanium alloys or titanium aluminium intermetallic compounds and application of chemical milling solution

An intermetallic compound and titanium alloy technology, applied in the field of chemical milling and cutting, can solve the problems of poor processing performance, high hardness, low room temperature plasticity, etc., and achieve the effects of high production efficiency, simple operation and high yield.

Inactive Publication Date: 2014-10-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its room temperature plasticity is low, its hardness is high, and its processing performance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of chemical milling solution is: hydrofluoric acid 50g / L, nitric acid 200g / L, hydrogen peroxide 150g / L, sodium polyphosphate 1g / L, urea 10g / L, sodium benzoate 5g / L, and the rest is water. Mix the above substances evenly to prepare chemical milling solution.

[0035] Put the chemical milling parts in aviation gasoline, soak for 10-20 minutes to remove the oil on the surface of the parts, then wash them with warm water at 40-50°C and dry them, and immerse the cleaned parts in the chemical milling solution at 40°C until the size meets Requirements, take out the parts and wash them with warm water at 40-50°C to remove the residual chemical milling solution on the surface. After chemical milling, there are no pits, ridges, intergranular corrosion and other defects on the surface of the product. The chemical milling rate is 0.011mm / min, and the hydrogen content increases by 18ppm after chemical milling.

Embodiment 2

[0037] The composition of chemical milling solution is: hydrofluoric acid 80g / L, nitric acid 250g / L, hydrogen peroxide 200g / L, sodium dihydrogen phosphate 3g / L, urea 10g / L, sodium benzoate 5g / L, and the rest is water. Mix the above substances evenly to prepare chemical milling solution.

[0038] Put the chemical milling parts in aviation gasoline, soak for 10-20 minutes to remove the oil stain on the surface of the parts, then wash and dry them with warm water at 40-50 °C, and immerse the cleaned parts in the chemical milling solution at 50 °C until the size meets Requirements, take out the parts and wash them with warm water at 40-50°C to remove the residual chemical milling solution on the surface. After chemical milling, there are no pits, ridges, intergranular corrosion and other defects on the surface of the product. The chemical milling rate is 0.018mm / min, and the hydrogen content increases by 17ppm after chemical milling.

Embodiment 3

[0040] The composition of chemical milling solution is: hydrofluoric acid 100g / L, nitric acid 500g / L, hydrogen peroxide 150g / L, potassium chromate 10g / L, urea 8g / L, sodium lauryl sulfate 5g / L, and the rest is water . Mix the above substances evenly to prepare chemical milling solution.

[0041] Put the chemical milling parts in aviation gasoline, soak for 10-20 minutes to remove the oil on the surface of the parts, then wash and dry them with warm water at 40-50 °C, and immerse the cleaned parts in the chemical milling solution at 55 °C until the size meets Requirements, take out the parts and wash them with warm water at 40-50°C to remove the residual chemical milling solution on the surface. After chemical milling, there are no pits, ridges, intergranular corrosion and other defects on the surface of the product. The chemical milling rate is 0.020mm / min, and the hydrogen content increases by 6ppm after chemical milling.

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PUM

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Abstract

The invention relates to the field of chemical milling processing and in particular relates to a chemical milling solution which can be used for the materials prone to hydrogen embrittlement, such as pure titanium, titanium alloys or titanium aluminum intermetallic compounds and the like, and a chemical milling method. The chemical milling solution comprises the following components: 20-350g / L of hydrofluoric acid, 150-750g / L of nitric acid, 50-550g / L of hydrogen peroxide, 0.5-20g / L of corrosion inhibitors, 5-200g / L of urea, 0.5-25g / L of surfactants, 0-100g / L of metal ions and the balance of water. The chemical milling method comprises the following steps: immersing metal materials subjected to pretreatment in the chemical milling solution, carrying out chemical milling processing on the materials at 35-75 DEG C, taking out the parts when achieving the chemical milling depth and washing out the chemical milling solution on the surfaces of the parts with clear water. The chemical milling solution and chemical milling processing method provided by the invention have the beneficial effects that the hydrogen absorption capacities of the metal materials prone to hydrogen embrittlement, such as titanium alloys and the like during chemical milling processing can be effectively controlled; hydrogen embrittlement harms to the parts can be reduced; the treated parts have good surface roughness and low hydrogen contents; and the whole chemical milling process is simple to operate.

Description

technical field [0001] The invention relates to the field of chemical milling, in particular to a chemical milling solution and a chemical milling method that can be used for materials prone to hydrogen embrittlement such as pure titanium, titanium alloys or titanium-aluminum intermetallic compounds. Background technique [0002] Chemical milling, also called corrosion processing, is a processing method that uses acid, alkali, salt and other chemical solutions to chemically react metals, dissolve the metals, and change the size and shape (or surface properties) of the workpiece. [0003] The chemical milling process is not limited by the hardness and strength of the material. During the process, there will be no defects such as stress and burrs, and the workpiece will not be deformed. It can process multiple surfaces and pieces at the same time, and the production efficiency is high. It is often used for spare parts processing of complex-shaped parts and thin-plate parts. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/04
Inventor 赵焕刘建国李庆鹏严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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