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Metallographic corrosion agent applied to titanium alloys

A corrosive agent, titanium alloy technology, applied in the field of titanium alloy metallographic observation, can solve problems such as toxicity and harmful health of operators, and achieve the effect of clear grain boundaries and favorable observation.

Inactive Publication Date: 2017-05-31
有研科技集团有限公司
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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 anhydride 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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  • Metallographic corrosion agent applied to titanium alloys
  • Metallographic corrosion agent applied to titanium alloys
  • Metallographic corrosion agent applied to titanium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First 50ml of water is placed in a plastic container, then 10ml of hydrofluoric acid (mass percentage concentration is 40%) and 10ml of nitric acid (mass percentage concentration is 65%) are added, then 10ml of acetone is added, and finally 20ml of ethanol (absolute ethanol) is added ),well mixed.

[0021] After the metallographic corrosion solution is prepared, immerse the polished titanium alloy sample in the prepared metallographic corrosion solution. The 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 to obtain the required metallographic structure observation sample.

[0022] The specific steps for making metallographic photos are:

[0023] (1) Cutting samples

[0024] (2) Mounting

[0025] (3) Grinding → polishing → 500# water sandpaper

[0026] (4) Polish with...

Embodiment 2

[0032] First put 65ml of water in a plastic container, then add 5ml of hydrofluoric acid (mass percentage concentration is 40%) and 5ml of nitric acid (mass percentage concentration is 65%), then add 10ml of acetone, and finally add 15ml of ethanol (absolute ethanol ),well mixed.

[0033] Such as image 3 Shown is a photo of the metallographic microstructure of a 5523 titanium alloy produced by using the metallographic etchant of the above composition at 700° C. under hot compression and water quenching. The production method is the same as in Example 1. It can be clearly seen that the metallographic structure is composed of (α+β) two phases, the α phase has a large precipitation ratio, and there is no single β structure alloy, and the structure contains some primary α phases that do not undergo transformation.

Embodiment 3

[0035] First put 55ml of water in a plastic container, then add 5ml of hydrofluoric acid (mass percentage concentration is 40%) and 10ml of nitric acid (mass percentage concentration is 65%), then add 10ml of acetone, and finally add 20ml of ethanol (absolute ethanol ),well mixed.

[0036] Such as Figure 4 Shown is the photo of the solid solution metallographic structure of the hot-rolled TB2 alloy produced using the metallographic etchant of the above composition, and the production method is the same as that of Example 1. The figure is the microstructure of the solution treatment at the temperature of the dual phase region. The curved grain boundaries can be clearly displayed, and the granular α phase precipitated inside the grains can be easily observed.

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Abstract

The invention relates to a metallographic corrosion agent applied to titanium alloys. The metallographic corrosion agent applied to titanium alloys comprises the following components in percentage by volume: 5-10% of hydrofluoric acid in mass percentage concentration of 40%, 5-10% of nitric acid in mass percentage concentration of 65%, 10-20% of absolute ethyl alcohol, 5-10% of acetone and the balance of water. The metallographic corrosion agent applied to titanium alloys has the advantages that the crystal boundaries of metallographic structures of the metallographic corrosion agent are clear due to application of the metallographic corrosion agent, beta matrix, precipitated alpha phase or other precipitated phases can be easily distinguished, and the metallographic corrosion agent is extremely beneficial to observation of the metallographic structures of the titanium alloys.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy metallographic observation, and relates to a titanium alloy metallographic etchant. Background technique [0002] Titanium alloy has strong corrosion resistance, which brings considerable inconvenience to the work of metallographic observation. When conventional corrosive agents are used to corrode, a film-like pollution layer that is difficult to remove is often formed on the surface of the metallographic sample. , the observation surface is blurred, which makes it difficult to identify the morphology 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 main scope of application is hig...

Claims

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Application Information

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IPC IPC(8): C23F1/26G01N1/32
CPCC23F1/26G01N1/32
Inventor 贺金宇李德富胡国平
Owner 有研科技集团有限公司