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Metallographic corrosive agent of high nitrogen stainless steel and metallographic structure display method

A metallographic structure display and high-nitrogen stainless steel technology is applied in the field of metallographic etchant and metallographic structure display of high-nitrogen stainless steel. The effect of controllable corrosion process, clear metallographic structure and neat grain boundary

Inactive Publication Date: 2017-04-26
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing high-nitrogen stainless steel etchant for corrosion, the obtained metallographic structure boundary is not clear enough, the structure is not uniformly corroded, the local over-corrosion is serious, and the effect of the structure display is not good

Method used

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  • Metallographic corrosive agent of high nitrogen stainless steel and metallographic structure display method
  • Metallographic corrosive agent of high nitrogen stainless steel and metallographic structure display method
  • Metallographic corrosive agent of high nitrogen stainless steel and metallographic structure display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The specific process of the method for displaying the metallographic structure of the present high-nitrogen stainless steel is as follows.

[0020] (1) Add 30ml of analytically pure hydrochloric acid to 60ml of ultrapure water, then add 30g of ferric chloride until dissolved, and finally add 30ml of analytically pure glycerol, stir with a glass rod until the solution is evenly mixed; the analytically pure (AR) The concentration of hydrochloric acid is 36wt% ~ 38wt%.

[0021] (2) Use a mosaic machine to embed the high-nitrogen stainless steel sample in phenolic resin, and polish the mosaic sample with 240#, 400#, 800#, 1000#, 1200# sandpaper on the polishing machine, and then polish it on the polishing machine A silk polishing cloth sprayed with 2.5 μm diamond polishing agent was used; the rotational speed during polishing was 750r / min, and the polishing time was 250s. The mosaic process is as follows: the holding temperature is 130° C., the holding time i...

Embodiment 2

[0024] Embodiment 2: The specific process of the method for displaying the metallographic structure of the high nitrogen stainless steel is as follows.

[0025] (1) Add 25ml of analytically pure hydrochloric acid to 65ml of ultrapure water, then add 20g of ferric chloride until dissolved, and finally add 23ml of analytically pure glycerin, and stir with a glass rod until the solution is evenly mixed.

[0026] (2) Grind the inlaid high-nitrogen stainless steel samples with 240#, 400#, 800#, 1000#, and 1200# sandpaper in a polishing machine, and then use silk cloth sprayed with 2.5 μm diamond polishing agent on the polishing machine Polishing; the rotational speed during polishing is 750r / min, and the polishing time is 300s; the mosaic process is the same as that in Example 1.

[0027] (3) Immerse the polished sample in the corrosion solution and keep it for 40 seconds, the surface of the sample turns silver gray.

[0028] (4) Immediately after the corrosion is completed, rinse...

Embodiment 3

[0029] Embodiment 3: The specific process of the method for displaying the metallographic structure of the present high-nitrogen stainless steel is as follows.

[0030] (1) Add 20ml of analytically pure hydrochloric acid to 70ml of ultrapure water, then add 35g of ferric chloride until dissolved, and finally add 40ml of analytically pure glycerin, and stir with a glass rod until the solution is evenly mixed.

[0031] (2) Grind the inlaid high-nitrogen stainless steel samples with 240#, 400#, 800#, 1000#, and 1200# sandpaper in a polishing machine, and then use silk cloth sprayed with 2.5 μm diamond polishing agent on the polishing machine Polishing; the rotational speed during polishing is 700r / min, and the polishing time is 360s; the mosaic process is the same as that in Example 1.

[0032] (3) Immerse the polished sample in the corrosion solution and keep it for 60 seconds, the surface of the sample turns silver gray.

[0033] (4) Immediately after the corrosion is complete...

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Abstract

The invention discloses a metallographic corrosive agent of high nitrogen stainless steel and a metallographic structure display method. The metallographic corrosive agent comprises 20 to 35g of ferric trichloride, 20 to 40ml of hydrochloric acid, 60 to 70ml of water and 20 to 40ml of glycerol. The metallographic corrosive agent effectively solves the problem that the existing corrosive agent easily over-corrodes a local part of a sample and causes structure corrosion nonuniformity so that the structureboundary is not clear and the metallographic structure display effect is poor. High nitrogen stainless steel corroded by the metallographic corrosive agent has a uniform corrosive surface, good corrosive effects, a clear metallographic structure, a tidy crystal boundary, can be easily washed, has no surface residues and pollutants, can be used in a metallographic sample preparation room without a fuming cupboard and does not damage the human body. The metallographic corrosive agent can be easily prepared, has no toxicity, damage and pungent smell, can be directly used in a metallographic sample preparation room without a fuming cupboard, can be washed easily, does not produce residues, does not produce pollution, has good corrosive effects and can produce a clear metallographic structure.

Description

technical field [0001] The invention relates to a metallographic detection technology, in particular to a metallographic etchant and a metallographic structure display method for high-nitrogen stainless steel. Background technique [0002] The excellent properties of stainless steel are well known. High-nitrogen stainless steel not only has all the excellent properties of the original stainless steel, but also has better performance than ordinary stainless steel in terms of mechanical properties and physical properties due to the addition of nitrogen. Therefore, high-nitrogen stainless steel is widely used in energy production, transportation, papermaking, petroleum, chemical and other fields. [0003] The internal structure of metal materials is directly and closely related to its various properties. Metallography is the most direct and effective method to study the internal structure of metal materials. The metallographic structure and corrosion resistance of high-nitroge...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N1/34
Inventor 谷秀锐孙晓冉嵇爽薛峰崔会杰
Owner HEBEI IRON AND STEEL
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