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Metallographic etchant and metallographic structure display method

A metallographic structure display and metallographic erosion technology, applied in the field of metallographic etchant and metallographic structure display, metallographic etchant, to achieve the effect of easy acquisition, good erosion reproducibility and stability, and clear grain boundary display

Pending Publication Date: 2021-02-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a metallographic etchant and a metallographic structure display method with low toxicity, no pollution, easy operation in the erosion process, and good erosion effect for the research and application of metallography such as titanium and titanium alloys.

Method used

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  • Metallographic etchant and metallographic structure display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A metallographic etchant, which is prepared from 0.75% gallic acid, 15% tartaric acid and deionized water according to the volume ratio of 2:2:3.

[0035] The metallographic etchant prepared in this embodiment is used to display the metallographic structure of TA2 titanium, and the specific method is:

[0036] Step 1. Cut a TA2 titanium sample with a size of 5mm×5mm×2mm, and use HMR1 hot mounting material to inlay the sample, which is convenient for the next step of grinding;

[0037] Step 2. Put the inlaid sample on the metallographic pre-grinder, and pass through 120# water-resistant sandpaper, 400# water-resistant sandpaper, 600# water-resistant sandpaper, 1200# water-resistant sandpaper, and 2000# water-resistant sandpaper respectively. Grinding from coarse grinding to fine grinding, the speed is 500r / min; during the grinding process, add water to cool continuously, when the scratches are all in the same direction, one grinding is completed, and the sandpaper is rep...

Embodiment 2

[0042] A metallographic etching agent is prepared by preparing 1.25% gallic acid, 20% tartaric acid and deionized water according to the volume ratio of 2:2:3.

[0043] The metallographic structure of TA2 titanium was visualized according to the method in Example 1, except that the etchant used was the etchant prepared in Example 2.

Embodiment 3

[0045] The metallographic structure was revealed according to the method and etchant in Example 2, except that the metallographic sample used was TA10 titanium alloy.

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Abstract

The invention discloses a metallographic etchant and a metallographic structure display method. The metallographic etchant is prepared from 0.75% to 1.25% of gallic acid, 15% to 20% of tartaric acid and deionized water according to the volume ratio of 2: 2: 3. According to the invention, gallic acid and tartaric acid are adopted to replace traditional etching agent formulas such as hydrofluoric acid, nitric acid, sulfuric acid and the like, an ideal metallographic specimen corrosion effect can also be achieved, and the toxicity is greatly reduced. The etchant can preferentially corrode the grain boundary of a metallographic specimen and has a light degree of corrosion in grains, so that the grain boundary form of a metallographic structure is clearly displayed, and excessive erosion is noteasy to occur.

Description

technical field [0001] The invention relates to a metallographic etchant, in particular to a metallographic etchant and a method for displaying a metallographic structure, and belongs to the technical field of metallographic corrosion. Background technique [0002] Titanium and its alloys have many excellent properties such as light weight, high strength, strong heat resistance, and corrosion resistance. important application. [0003] In order to study the properties of titanium and titanium alloys, it is necessary to display and observe the microstructure of titanium and titanium alloys to determine their fine microstructures, and then adjust their composition, processing and heat treatment processes in time according to the analysis results, so that the materials can reach Best price / performance ratio. In the prior art, Kroll reagent, a general-purpose etchant containing hydrofluoric acid, is usually used to etch titanium materials such as TA2. Time is not easy to gras...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N33/204
CPCG01N1/32G01N33/204
Inventor 鲍恩成李云钊王龙山刘洋洋李文廷张宏科
Owner WANHUA CHEM GRP CO LTD
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