Corrosive agent for displaying fine austenite grain boundary of low-carbon microalloyed steel and using method

A technology of austenite grain boundary and corrosive agent, which is applied in the display field of fine austenite grain boundary of low-carbon micro-alloy steel, can solve the problems of explosion hazard and damage to instruments, and achieve the effect of increasing safety and reducing harm to human body

Active Publication Date: 2020-04-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The picric acid experiment process is also very dangerous. If it is accidentally splashed on the instrument, it will damage the instrument, and there is a danger of explosion during the heating process.

Method used

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  • Corrosive agent for displaying fine austenite grain boundary of low-carbon microalloyed steel and using method
  • Corrosive agent for displaying fine austenite grain boundary of low-carbon microalloyed steel and using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: The composition of the etchant used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is 97.5% saturated citric acid solution, saturated FeCl 3 Solution 1%, detergent 1.5%.

[0012] (1) Add 10 mL of deionized water to two beakers, add citric acid to beaker A to saturation, and add FeCl to beaker B 3 to saturation, then use a gel-tip dropper to saturate the FeCl 3 Add the solution dropwise into beaker A, then add detergent and stir evenly; the amount of corrosive agent can be determined according to the sample and beaker capacity, and the corrosive agent is required to soak the sample;

[0013] (2) Put the beaker A into a water bath heating furnace and heat it to 70°C, put the polished steel sample into the beaker A with the polished side up, and keep it warm for 4 minutes. In order to prevent over-corrosion, the corrosion process should be taken every minute Come out to observe the polished surface; after the corrosion is c...

Embodiment 2

[0015] Example 2: The etchant composition used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is saturated citric acid solution: 98%, saturated FeCl 3 Solution 1%, detergent 1%.

[0016] When in use, heat the etchant to 60°C, put the polished steel sample into the etchant, keep the polished surface up, and keep warm for 5 minutes; take out the steel sample and clean it, wipe the polished surface with absolute ethanol, and dry it to obtain Metallographic phase with clear grain boundaries; and the grain boundaries corroded by the etchant are completely displayed, and the corrosion effect is stable.

Embodiment 3

[0017] Example 3: The composition of the etchant used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is 99% saturated citric acid solution, saturated FeCl 3 Solution 0.5%, detergent 0.5%.

[0018] When in use, heat the etchant to 80°C, put the polished steel sample into the etchant, keep the polished surface up, and keep warm for 3 minutes; take out the steel sample and clean it, wipe the polished surface with absolute ethanol, and dry it to obtain Metallographic phase with clear grain boundaries; and the grain boundaries corroded by the etchant are completely displayed, and the corrosion effect is stable.

[0019] The invention is suitable for corroding small austenite grain boundaries of low-carbon microalloy steel, and the corrosion effect of the steel sample with too high carbon content and large grain boundaries is not good.

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PUM

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Abstract

The invention discloses a corrosive agent for displaying a fine austenite grain boundary of low-carbon microalloyed steel. The corrosive agent comprises the following components in percentage by volume: 97.5-99% of a saturated citric acid solution, 0.5-1% of a saturated FeCl3 solution and 0.5-1.5% of a detergent; the corrosive agent is used for displaying the fine austenite grain boundary of the low-carbon microalloyed steel, and experimental results show that a metallographic phase with a clear grain boundary can be obtained; the grain boundary corroded by the corrosive agent is completely displayed, the corrosion effect is stable, most importantly, picric acid is not needed in the formula and the use process of the corrosive agent, harm to the human body is reduced, and the safety of a laboratory is improved.

Description

technical field [0001] The invention belongs to the field of displaying fine austenite grain boundaries of low-carbon micro-alloy steels, in particular to an etchant capable of clearly displaying the grain boundaries of low-carbon micro-alloy recrystallized fine austenite grains and a method for using the same. Background technique [0002] In the past, the austenite grain boundary of steel was displayed by immersing the polished steel sample in supersaturated picric acid and heating it in a water bath (hot corrosion method); but this method is unstable, and the sample corroded by picric acid will appear corrosion Inhomogeneous phenomenon, there will be partial over-corrosion (coarse grain boundaries) and some grain boundaries will not appear. At the same time, picric acid is very harmful, if the human body is exposed to a large amount or for a long time, it will cause contact dermatitis, conjunctivitis and bronchitis, and there will be reactions such as headache, dizziness,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32C23F1/28
CPCC23F1/28G01N1/32
Inventor 曹建春吴雍壕周晓龙高鹏杨银辉郝天赐
Owner KUNMING UNIV OF SCI & TECH
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