Metallographic etching agent

A technology of etchant and hydrofluoric acid, which is applied in the field of metallographic etchant, can solve the problems of blurred observation surface, difficult identification of precipitated phase morphology, observation of metallographic structure and identification of adverse effects, etc., to achieve clear grain boundaries and easy identification Effect

Inactive Publication Date: 2008-01-16
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Using the metallographic etchant mentioned above to corrode titanium alloys, especially the near-β titanium alloys or metastable β titanium alloys in the aging state, will often form a film-like contamination layer on the surface of the metallograph

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First place 55ml of water in a plastic container, then add 10ml of hydrofluoric acid (40% by mass concentration) and 10ml of nitric acid (65% by mass concentration), finally add 15ml of acetone and 10ml of acetic acid, and mix well.

Embodiment 2

[0017] First place 42ml of water in a plastic container, then add 12ml of hydrofluoric acid (mass percentage concentration is 40%) and 12ml of nitric acid (mass percentage concentration is 65%), finally add 18ml of acetone and 16ml of acetic acid dry, mix well.

Embodiment 3

[0019] First place 40ml of water in a plastic container, then add 15ml of hydrofluoric acid (mass percentage concentration is 40%) and 15ml of nitric acid (mass percentage concentration is 65%), finally add 15ml of acetone and 15ml of acetic acid dry, mix well.

[0020] After the corrosion solution is prepared, immerse the polished TB8 titanium alloy sample in the prepared metallographic corrosion solution. 5 to 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.

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PUM

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Abstract

The invention discloses a corrosive for metallography, which is composed of hydrofluoric acid, nitric acid, acetone, acetic anhydride and water. With the inventive corrosive, the metallographic observation surface is bright, the grain boundary of metallurgical structure is clear, and the alpha phase or other phases precipitated by diffusion are easy to distinguish. The invention is particularly suitable for the use as a corrosive for approximate beta Ti alloys and metastable beta Ti alloys.

Description

technical field [0001] The invention relates to a metallographic etchant, which is especially suitable for the metallographic corrosion of near-beta and metastable beta titanium alloys in an aging state. Background technique [0002] In the process of titanium alloy research, the difference in material composition and the difference in processing and heat treatment process often result in different types of metallographic structure, and the performance of the final alloy is also different. In order to obtain the required titanium alloy, it is necessary to observe the metallographic structure of the alloy, and combine the performance test data to adjust the composition, processing technology or heat treatment process of the alloy in time. [0003] Usually, the metallographic etchant of titanium alloy is made up of components such as hydrofluoric acid, nitric acid, hydrochloric acid, water (such as patent " a kind of metallographic etchant " (patent No. is: ZL97103866.x). Use ...

Claims

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Application Information

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IPC IPC(8): C23F1/26
Inventor 范荣辉贺金宇李德富沈健朱明
Owner GRIMAT ENG INST CO LTD
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