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Metallurgical phase corrosive agent

A technology of corrosive agent and hydrofluoric acid, which is applied in the field of metallographic corrosive agents, can solve problems such as toxicity and health hazards of operators, and achieve the effect of clear and easy-to-distinguish grain boundaries

Inactive Publication Date: 2010-06-16
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As the etchant that can make the grain boundary clear and easily distinguish the dispersed precipitated phase, for example, the publication number CN 101104935A discloses hydrofluoric acid (mass percentage concentration is 40%) 10-15%, nitric acid (mass percentage concentration is 65%) 10-15%. 15%, acetone 15-20%, acetic acid dry 10-20%, and the rest is a metallographic corrosion solution of water. Acetone has certain toxicity, and long-term use is harmful to the health of operators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First place 50ml of water in a plastic container, then add 10ml of hydrofluoric acid (40% by mass concentration) and 20ml of nitric acid (65% by mass concentration), and finally add 20ml of ethanol (absolute ethanol), and mix well.

[0024] After the corrosive solution is prepared, the polished titanium alloy sample is immersed in the prepared metallographic corrosive solution. When immersed, the metallographic observation surface of the sample is perpendicular to the corrosive liquid surface. The sample can be slightly shaken during etching. The etching time is 5-10 seconds. After etching, take out the alloy sample, rinse it with water repeatedly, then gently wipe the metallographic observation surface of the sample with a cotton ball dipped in alcohol, and let it dry naturally or with a hair dryer. In this way, the desired metallographic structure observation sample is obtained.

[0025] The specific steps for making metallographic photos are:

[0026] (1) Cutting s...

Embodiment 2

[0035] First place 65ml of water in a plastic container, then add 5ml of hydrofluoric acid (40% by mass concentration) and 10ml of nitric acid (65% by mass concentration), and finally add 20ml of ethanol (absolute ethanol), and mix well.

[0036] Such as image 3 As shown, it is a photo of the aging state metallographic structure of the 5523 alloy spinning pipe produced by using the etchant of the above composition, and the production method is the same as that in Example 1. This picture is the microstructure of temperature solution + aging treatment in the dual-phase region, which is a typical aging structure of β-titanium alloy, in which the dark-colored structure is the β-phase matrix, and the white structure is the α-phase precipitation.

Embodiment 3

[0038] First place 40ml of water in a plastic container, then add 10ml of hydrofluoric acid (40% by mass concentration) and 20ml of nitric acid (65% by mass concentration), and finally add 30ml of ethanol (absolute ethanol), and mix well.

[0039] Such as Figure 4 Shown is the photo of the aging state metallographic structure of the TB8 alloy forging produced by using the etchant of the above composition, and the production method is the same as that of Example 1. This picture is the microstructure of temperature solution + aging treatment in the dual-phase region, which is a typical aging structure of β-titanium alloy, in which the dark-colored structure is the β-phase matrix, and the white structure is the α-phase precipitation.

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Abstract

The invention relates to a metallurgical phase corrosive agent, in particular to a metallurgical phase corrosive agent suitable to be used for beta titanium alloy at the aging state. The corrosive agent comprises the following components in percentage by volume: 5 to 10 percent of hydrofluoric acid (the mass percentage concentration is 40 percent), 10 to 20 percent of nitric acid(the mass percentage concentration is 65 percent), 20 to 30 percent of ethanol(absolute ethyl alcohol) and the balance of water. By using the metallurgical phase corrosive agent, the metallurgical phase observing surface is smooth and bright, the crystal boundary of the metallurgical structure is clear, and the alpha phase, dispersively precipitated, or other precipitated phases can be easily identified, so that the metallurgical phase corrosive agent is particularly suitable to be used as the metallurgical phase corrosive agent of the beta titanium alloy at the aging state.

Description

technical field [0001] The invention relates to a metallographic etchant, in particular to a metallographic etchant suitable for aged β titanium alloys. Background technique [0002] Titanium alloys have strong corrosion resistance, which brings considerable inconvenience to the work of metallographic observation, especially for aging-treated β-titanium alloys, which often appear in metallographic samples when corroded by conventional corrosive agents. A film-like pollution layer that is difficult to remove is formed on the surface, and the observation surface is blurred, making it difficult to identify the appearance of the precipitated phase, which has an adverse effect on the observation and identification of the metallographic structure. [0003] As an etchant that can make the grain boundaries clear and the dispersed precipitates can be easily distinguished, for example, patent ZL97103866. It is 0.1-0.3g, butyric acid is 1-3g metallographic corrosion solution, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/26
Inventor 贺金宇范荣辉李德富
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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