Corroding method for metallographic specimen of high nickel-chromium alloy

A metallographic sample, high-nickel-chromium technology, applied in the field of metallographic corrosion of metal materials, can solve problems such as the inability to prevent alloy surface passivation, difficulty in controlling the degree of corrosion, etc., to achieve the elimination of surface passivation and the degree of corrosion Controllable and easy-to-operate effects

Inactive Publication Date: 2015-04-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a method for corroding metallographic samples of high-nickel-chromium alloys, which solves the problem that the alloy surface cannot be prevented from being passivated and the degree of corrosion is difficult to control during corrosion by ordinary chemical methods

Method used

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  • Corroding method for metallographic specimen of high nickel-chromium alloy
  • Corroding method for metallographic specimen of high nickel-chromium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sample 1:

[0019] Alloy grade: Cr20Ni80;

[0020] Composition (weight ratio): Cr: 20%, Ni: 80%;

[0021] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0022] Etching time: 1.5 minutes;

[0023] The metallographic photo of sample 1 after corrosion treatment is as follows: figure 2 shown.

Embodiment 2

[0025] Sample 2:

[0026] Alloy grade: Cr15Ni60;

[0027] Composition (weight ratio): Cr: 15%, Ni: 60%, Fe: 25%;

[0028] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0029] Etching time: 1 minute.

Embodiment 3

[0031] Sample 3:

[0032] Alloy grade: Cr30Ni70;

[0033] Composition (weight ratio): Cr: 30%, Ni: 70%;

[0034] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0035] Etching time: 3 minutes.

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Abstract

The invention discloses a corroding method for a metallographic specimen of a high nickel-chromium alloy. The method comprises the following steps: soaking a pretreated metallographic specimen in a corrosive liquid with a corrosive face facing downward; and slowly lifting up the specimen above the liquid level of the corrosive liquid, wherein the peak of a corrosive drop on the corrosive face is contacted with the liquid level of the corrosive liquid. The display method of the metallographic structure of the alloy specimen provided by the invention is suitable for high nickel-chromium alloy which is hard to corrode by conventional methods. By selecting a proper corrosive liquid, the high nickel-chromium alloy specimen is corroded by virtue of the method disclosed by the invention, so that surface passivation of the corrosive face of the specimen can be eliminated. The corrosive degree can be controlled, the metallographic structure is clearly displayed and the operating method is simple and convenient.

Description

technical field [0001] The invention relates to the field of metallographic corrosion of metal materials, in particular to a method for corroding metallographic samples of high-nickel-chromium alloys. Background technique [0002] Among the display methods of various metallographic sample structures, the most commonly used method is chemical etching. Chemical etching is the process of chemical dissolution or electrochemical dissolution of the sample surface. Pure chemical dissolution is less, and the corrosion of pure metals and homogeneous single-phase alloys is usually regarded as a chemical dissolution process, and the corrosion of two-phase or multi-phase alloys is regarded as an electrochemical dissolution process. [0003] The microstructure of pure metals and single-phase alloys is composed of many grains. When the polished sample is contacted with the etching reagent, the residual deformation disturbance layer on the polished surface is dissolved first, and then th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32C23F1/28
Inventor 陈兴纲王玉山昝斌柏先林
Owner JINCHUAN GROUP LIMITED
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