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Metallographic etchant and erosion method of austenitic stainless steel

A technology of austenitic stainless steel and corrosive liquid, which is applied in the field of metallographic corrosion, can solve problems such as inability to clearly display grain boundaries, unsatisfactory structure display, and potential safety hazards, and achieve easy operation, clear austenite grain boundaries, and easy The effect of control

Active Publication Date: 2012-06-27
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, the metallographic etchant of austenitic stainless steel uses nitric acid, hydrochloric acid, and water (generally about 70% of water) according to a certain percentage ratio, or hydrofluoric acid, nitric acid, and water according to a certain volume percentage. The invention patent application No. 200810042434.2 discloses a metallographic etchant mentioned above. Although this etchant can achieve the purpose of displaying the metallographic structure, when the sample is corroded, the reaction is violent, it is not easy to operate, and there are certain safety hazards , and the above method cannot clearly display the grain boundary, and the structure is not ideal, and the corrosion structure is as follows figure 1 shown

Method used

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  • Metallographic etchant and erosion method of austenitic stainless steel
  • Metallographic etchant and erosion method of austenitic stainless steel
  • Metallographic etchant and erosion method of austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Corrosive formulation.

[0022] The metallographic etchant is a mixed solution of hydrochloric acid, glycerol, nitric acid and hydrogen peroxide, and the volume percentages of each group are: hydrochloric acid (mass percentage concentration is 40%): 33%; nitric acid (mass percentage concentration is 68%): 17%; Glycerol: 33%; Hydrogen peroxide (30% by mass): 17%.

[0023] Corrosive preparation.

[0024] Prepare the corrosive agent in the following order: first take 40ml of hydrochloric acid, then measure 20ml of nitric acid, then measure 40ml of glycerin, and finally mix with 20ml of hydrogen peroxide and make it react fully, and let it stand for about 30 minutes before use.

[0025] Metallographic corrosion.

[0026] The samples were coarsely ground, finely ground, polished, cleaned and dried according to conventional methods.

[0027] Fully immerse the prepared sample in the prepared etchant and corrode for about 20 minutes. The corrosion surface of the sample shou...

Embodiment 2

[0030] Corrosive formulation.

[0031] The metallographic etchant is a mixed solution of hydrochloric acid, glycerol, nitric acid and hydrogen peroxide, and the volume percentages of each component are: hydrochloric acid (mass percentage concentration is 40%): 33%; glycerol: 30%; nitric acid (mass percentage concentration is 40%): 33%; The percentage concentration is 68%): 20%; hydrogen peroxide (mass percentage concentration is 30%): 17%.

[0032] Corrosive preparation.

[0033] Prepare the corrosive agent in the following order: first take 40 ml of hydrochloric acid, then measure 24 ml of nitric acid, then measure 36 ml of glycerin, and finally mix with 20 ml of hydrogen peroxide and make it react fully, and let it stand for 30 minutes before use.

[0034] Metallographic corrosion.

[0035] The samples were coarsely ground, finely ground, polished, cleaned and dried according to conventional methods.

[0036] Fully immerse the prepared sample in the prepared etchant and c...

Embodiment 3

[0039] Corrosive formulation.

[0040] The metallographic etching agent is a mixed solution of hydrochloric acid, glycerol, nitric acid and hydrogen peroxide, and the volume percentages of each component are: hydrochloric acid (mass percentage concentration is 40%): 31%; nitric acid (mass percentage concentration is 68%) Glycerol: 19%; Glycerol: 31%; Hydrogen peroxide (mass percentage concentration is 30%): 19%.

[0041] Corrosive preparation

[0042] Prepare the corrosive agent in the following order: first take 37ml of hydrochloric acid, then measure 23ml of nitric acid, then measure 37ml of glycerin, and finally mix with 23ml of hydrogen peroxide and make it react fully, and let it stand for about 30 minutes before use.

[0043] Metallographic corrosion.

[0044] The samples were coarsely ground, finely ground, polished, cleaned and dried according to conventional methods.

[0045] Fully immerse the prepared sample in the prepared etchant and corrode for about 15 minutes...

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Abstract

The invention relates to a metallographic etchant and an erosion method of austenitic stainless steel, which are especially suitable for metallographic erosion of 316 / 316L / 316H / 317 / 317L austenitic stainless steels. The metallographic etchant of the invention is composed of the following ingredients in percentage by volume: 30-35% of hydrochloric acid with mass percent concentration of 40%, 15-20%of nitric acid with mass percent concentration of 68%, 30-35% of propanetriol, and 15-20% of hydrogen peroxide solution with mass percent concentration of 30%. The metallographic etchant of the invention has the advantages of reasonable design, good erosion effect, good tissue display effect of eroded sample, non-pollution and slow and stable erosion reaction.

Description

technical field [0001] The invention relates to a metallographic corrosion solution and corrosion method of austenitic stainless steel, which is especially suitable for metallographic corrosion of 316 / 316L / 316H / 317 / 317L austenitic stainless steel. Background technique [0002] Since its inception, austenitic stainless steel has been playing an important role in stainless steel due to its good comprehensive properties, and its production and usage account for about 70% of the total production and usage of stainless steel. Due to the difference in composition, the structure and performance of stainless steel will have certain differences, so it is necessary to observe the metallographic structure of austenitic stainless steel. [0003] Usually, the metallographic etchant of austenitic stainless steel uses nitric acid, hydrochloric acid, and water (generally about 70% of water) according to a certain percentage ratio, or hydrofluoric acid, nitric acid, and water according to a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 杨振颜海涛袁辉刘腾飞申鹏
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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