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Metallographic structure etching solution of high-nitrogen stainless steel and metallographic etching method

A high-nitrogen stainless steel and corrosion solution technology, applied in the preparation of test samples, etc., can solve the problems of insufficient metallographic structure boundary, corrosion of high-nitrogen steel metallographic structure, poor structure display effect, etc., and achieve corrosion process Controllable, clear grain boundary, good display effect

Active Publication Date: 2015-03-11
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The corrosion solution of ordinary steel is generally 4% nitric acid alcohol, but this kind of corrosion solution cannot achieve the effect of corroding the metallographic structure of high nitrogen steel
However, the common stainless steel corrosion solution and method described in the invention patent No. 200810042434.2 is adopted, and the mixed solution of hydrofluoric acid, nitric acid and water is used as the corrosion solution, the boundary of the metallographic structure is not clear enough, and the effect of the structure display is not good. , and easily cause environmental pollution

Method used

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  • Metallographic structure etching solution of high-nitrogen stainless steel and metallographic etching method
  • Metallographic structure etching solution of high-nitrogen stainless steel and metallographic etching method
  • Metallographic structure etching solution of high-nitrogen stainless steel and metallographic etching method

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Use analytical reagents hydrochloric acid, acetic acid, nitric acid and glycerin as raw materials, mix and prepare a solution according to the volume ratio of 35:25:30:10, and set aside.

[0034] (2) Polish the inlaid samples with 200#, 400#, 600#, 800#, 1000# sandpaper, and then polish them with silk cloth sprayed with 2.5μm diamond polishing agent;

[0035] (3) Immerse the polished sample in the corrosion solution and keep it for 120 seconds until the surface of the sample turns silver gray;

[0036] (4) Rinse the surface of the sample with deionized water immediately after the corrosion is completed, then rinse the surface of the sample with absolute ethanol, and finally dry it with compressed air, and then observe it under a microscope. The metallographic structure of the sample is as follows: figure 1 shown.

Embodiment 2

[0038] (1) Use analytical reagents hydrochloric acid, acetic acid, nitric acid and glycerin as raw materials, mix and prepare a solution according to the volume ratio of 38:27:30:5, and set aside.

[0039] (2) Polish the inlaid samples with 200#, 400#, 600#, 800#, 1000# sandpaper, and then polish them with silk cloth sprayed with 2.5μm diamond polishing agent;

[0040] (3) Immerse the polished sample in the corrosion solution and keep it for 60 seconds until the surface of the sample turns silver gray;

[0041] (4) Rinse the surface of the sample with deionized water immediately after the corrosion is completed, then rinse the surface of the sample with absolute ethanol, and finally dry it with compressed air, and then observe it under a microscope. The metallographic structure of the sample is as follows: figure 2 shown.

Embodiment 3

[0043] (1) Use analytical reagents hydrochloric acid, acetic acid, nitric acid and glycerin as raw materials, mix and prepare a solution according to the volume ratio of 40:30:25:5, and set aside.

[0044] (2) Polish the inlaid samples with 200#, 400#, 600#, 800#, 1000# sandpaper, and then polish them with silk cloth sprayed with 2.5μm diamond polishing agent;

[0045] (3) Use absorbent cotton dipped in corrosive solution to repeatedly wipe the surface of the polished sample until the surface turns silver gray;

[0046] (4) Rinse the surface of the sample with deionized water immediately after the corrosion is completed, then rinse the surface of the sample with absolute ethanol, and finally dry it with compressed air, and then observe it under a microscope. The metallographic structure of the sample is as follows: image 3 shown.

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Abstract

The invention discloses metallographic structure etching solution of high-nitrogen stainless steel. The metallographic structure etching solution comprises the following constituents in percent by volume: 35 to 40 percent of hydrochloric acid, 25 to 30 percent of acetic acid, 25 to 30 percent of nitric acid, and 5 to 10 percent of glycerinum. An etching method comprises the following steps: firstly, preparing the etching solution, secondly, sanding and polishing an embedded sample, thirdly, immersing the polished sample into the etching solution to etch the sample till the surface of the sample becomes silver gray, or repeatedly wiping the surface of the sample with degreasing cotton dipped with the etching solution till the surface of the sample becomes silver gray; fourthly, washing the surface of the sample through deionized water immediately after etching, then washing the surface of the sample through absolute ethyl alcohol, finally drying the surface of the sample through compressed air, and observing a microstructure through a microscope. The etching solution is easy to prepare, nontoxic and harmless, good in etching effect and clear in crystal boundary; the etching method is simple to operate, the etching process is controllable, and the display effect of a metallographic structure is good.

Description

technical field [0001] The invention relates to the technical field of metallographic detection and analysis, in particular to a metallographic structure corrosion solution and a metallographic corrosion method of high-nitrogen stainless steel. Background technique [0002] In recent years, the role of nitrogen in stainless steel has attracted great attention. The addition of nitrogen in stainless steel can have a great impact on its performance, mainly in the aspects of the matrix structure, mechanical properties and corrosion resistance of stainless steel. Studies have shown that nitrogen can stabilize and expand the austenite phase region, which has a great influence on the matrix structure of stainless steel. Therefore, it is very necessary to observe the metallographic structure of high nitrogen steel and study the influence of nitrogen on its structure and properties. [0003] The corrosion solution for common steel grades is generally 4% nitric acid alcohol, but ...

Claims

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Application Information

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IPC IPC(8): C23F1/28G01N1/32
Inventor 胡加佳安晖史远李铸铁
Owner HEBEI IRON AND STEEL
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