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Erosion agent for Super304H austenitic stainless steel durable specimen tissue display, preparation method and application method

A technology of austenitic stainless steel and etchant, applied in the preparation of test samples, etc., to achieve the effect of easy control of erosion speed, strong reusability, and clear display

Active Publication Date: 2016-12-21
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing Super304H austenitic stainless steel structure etchant that it is difficult to completely and clearly show the grain boundaries and precipitated phases of the Super304H durable sample, to ensure the accuracy of the high-temperature aging damage analysis of the Super304H durable sample, and to provide a An etchant that can clearly display the grain boundaries and precipitated phases of the microstructure of a durable sample of Super304H austenitic stainless steel, a preparation method and an application method

Method used

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  • Erosion agent for Super304H austenitic stainless steel durable specimen tissue display, preparation method and application method
  • Erosion agent for Super304H austenitic stainless steel durable specimen tissue display, preparation method and application method
  • Erosion agent for Super304H austenitic stainless steel durable specimen tissue display, preparation method and application method

Examples

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Effect test

Embodiment 1

[0023] Example 1: Mix 50 milliliters of distilled water and 50 milliliters of dehydrated ethanol in a beaker, measure 20 milliliters of analytically pure hydrochloric acid and 20 milliliters of analytically pure hydrofluoric acid, and slowly add them to the beaker along the inner wall of the beaker, stirring continuously. Finally, add and weigh 5 grams of ferric trichloride, stir and mix evenly to obtain the etchant.

Embodiment 2

[0024] Example 2: Mix 45 milliliters of distilled water and 56 milliliters of absolute ethanol in a beaker, measure 18 milliliters of analytically pure hydrochloric acid and 18 milliliters of analytically pure hydrofluoric acid, and slowly add them into the beaker along the inner wall of the beaker, stirring continuously. Finally, add and weigh 4.5 grams of ferric chloride, stir and mix evenly to obtain the etchant.

Embodiment 3

[0025] Example 3: Mix 45 milliliters of water and 62 milliliters of absolute ethanol in a beaker, measure 19 milliliters of analytically pure hydrochloric acid and 19 milliliters of analytically pure hydrofluoric acid, and slowly add them to the beaker along the inner wall of the beaker, stirring constantly, Finally, add and weigh 5.5 grams of ferric trichloride, stir and mix evenly to obtain the etchant.

[0026] The application method of etching agent of the present invention is as follows:

[0027] 1) Take a metallographic test block from the Super304H durable sample, grind and mechanically polish the surface, clean it with absolute ethanol, and then dry it with a hair dryer;

[0028] 2) Pour the etching agent of the present invention into a glass vessel with absorbent cotton, and immerse the metallographic test block of the polished Super304H durable sample with the erosion side facing down, and the erosion time is 1-3 minutes. When the surface of the sample is white-gray...

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Abstract

The invention discloses an erosion agent for Super304H austenitic stainless steel durable specimen tissue display, a preparation method and an application method, and the erosion agent comprises 30-40% by volume of distilled water, 35-45% by volume of analytically pure absolute ethanol, 10-15% by volume of analytically pure hydrofluoric acid, 10-15% by volume of analytically pure hydrochloric acid and 3-5% by mass of ferric chloride; the volume fraction of each component is the percentage of each component in the total volume of the erosion agent, and the mass fraction is the percentage of a solid in the total mass of the erosion agent. The invention also discloses the preparation method and the application method of the erosion agent. The erosion agent solves the problems that precipitated phases and crystal boundaries in a durable specimen are difficult to display by use of a Super304H austenitic stainless steel erosion agent in the prior art.

Description

technical field [0001] The invention belongs to an etchant for metallographic inspection methods of metal materials, and in particular relates to an etchant for Super304H austenitic stainless steel permanent sample structure display, a preparation method and an application method. Background technique [0002] At present, the most commonly used chemical etching agents for metallographic examination of Super304H austenitic stainless steel are mainly aqua regia (the volume ratio of hydrochloric acid and nitric acid is 3:1) and ferric chloride hydrochloric acid aqueous solution (5 grams of ferric chloride + 50 ml of hydrochloric acid + 100 ml of water). The newly formulated aqua regia needs to be used after 24 hours, and is mainly used in Super304H austenitic stainless steel raw materials, while the ferric chloride hydrochloric acid aqueous solution can be prepared and used immediately, and is suitable for Super304H austenitic stainless steel after service. [0003] Under the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 田晓徐慧秦承鹏王理博杨百勋曹剑峰
Owner XIAN THERMAL POWER RES INST CO LTD
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