Steel grain size etchant and application thereof

A technology of grain size and etchant, which is applied in particle size analysis, particle and sedimentation analysis, preparation of test samples, etc., can solve the problems of poor erosion effect and poor effect in polluted environment, achieve good effect, save time and cost, Simple operation effect

Pending Publication Date: 2020-12-15
CRRC QISHUYAN INSTITUTE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a steel grain size etchant to solve the problems in the prior art that reagents such as nitric acid ethanol solution and picric acid pollute the environment or have poor corrosion effects

Method used

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  • Steel grain size etchant and application thereof
  • Steel grain size etchant and application thereof
  • Steel grain size etchant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A steel grain size etchant comprising an aromatic nitro compound, a surfactant and a thinner. Wherein, the aromatic nitro compound is 2-nitrobenzoic acid, the surfactant is sodium lauryl sulfate, and the diluent is water and glycerin. On a mass basis, the component ratio of 2-nitrobenzoic acid and sodium lauryl sulfate is 1:1.10, the sum of the components of 2-nitrobenzoic acid and sodium lauryl sulfate and the component of the diluent The ratio is 1.25:100, and the composition ratio of water and glycerin is 8:1. The steel grain size etchant of this embodiment is obtained by uniformly mixing the above raw materials.

[0033] Adopt the etchant of present embodiment to corrode gear steel (18CrNiMo7-6), and observe with metallographic microscope, the metallographic structure result that obtains is as follows figure 1 shown. Depend on figure 1 It can be seen that the erosion effect of this example is good, the microstructure and grain boundaries (black thin lines) of th...

Embodiment 2

[0035] A steel grain size etchant comprising an aromatic nitro compound, a surfactant and a thinner. Wherein, the aromatic nitro compound is 2-nitrobenzoic acid, the surfactant is sodium lauryl sulfate, and the diluent is water and glycerin. On a mass basis, the component ratio of 2-nitrobenzoic acid and sodium lauryl sulfate is 1:1.30, the sum of the components of 2-nitrobenzoic acid and sodium lauryl sulfate and the component of the diluent The ratio is 1.25:100, and the composition ratio of water and glycerin is 8:1. The steel grain size etchant of this embodiment is obtained by uniformly mixing the above raw materials.

[0036] Adopt the etchant of present embodiment to corrode gear steel (18CrNiMo7-6), and observe with metallographic microscope, the metallographic structure result that obtains is as follows figure 2 shown. Depend on figure 2 It can be seen that the erosion effect of this example is good, the microstructure and grain boundaries (black thin lines) of ...

Embodiment 3

[0038] A steel grain size etchant comprising an aromatic nitro compound, a surfactant and a thinner. Wherein, the aromatic nitro compound is 2-nitrobenzoic acid, the surfactant is sodium lauryl sulfate, and the diluent is water and glycerin. On a mass basis, the component ratio of 2-nitrobenzoic acid and sodium lauryl sulfate is 1:1.70, the sum of the components of 2-nitrobenzoic acid and sodium lauryl sulfate and the component of the diluent The ratio is 1.25:100, and the composition ratio of water and glycerin is 8:1. The steel grain size etchant of this embodiment is obtained by uniformly mixing the above raw materials.

[0039] Adopt the etchant of present embodiment to corrode gear steel (18CrNiMo7-6), and observe with metallographic microscope, the metallographic structure result that obtains is as follows image 3 shown. Depend on image 3 It can be seen that the erosion effect of this example is good, the microstructure and grain boundaries (black thin lines) of th...

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PUM

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Abstract

The invention provides a steel grain size etchant and application thereof. The etchant provided by the invention adopts an aromatic nitro compound, a surfactant and a diluent, and the mass ratio of the aromatic nitro compound to the surfactant is 1:1-1:2. And the aromatic nitro compound is p-nitrobenzoic acid and / or 2-nitrobenzoic acid. The surfactant is any one or a combination of lauryl sodium sulfate, fatty alcohol-polyoxyethylene ether sodium sulfate, dodecylbenzene sulfonic acid, dodecyl alcohol amide and nonylphenol polyoxyethylene ether. The diluent is water and glycerol. The etchant disclosed by the invention does not contain toxic and explosive picric acid, so that the pollution to the environment and the influence on public safety are avoided, and the environmental protection requirement is met. In addition, the etchant provided by the invention can clearly display grain boundaries of large crystal grains, small crystal grains and large and small mixed crystal grains of a sample, the grain size is clear and complete under 100 times, the grain size grading is easy to carry out, and the effect is good.

Description

technical field [0001] The invention relates to the application field of etchant, in particular to a steel grain size etchant and its application. Background technique [0002] The actual grain size of steel has a great influence on mechanical properties, physical properties and chemical properties. Therefore, the evaluation of actual grain size is very important for judging the quality of steel, checking the correctness of thermal processing technology, and studying grain size. It is of great significance to the impact on related performance. [0003] The display of grain size of iron and steel materials is generally corroded by nitric acid ethanol solution (usually high temperature oxidation method), saturated picric acid, picric acid and sodium dodecylbenzenesulfonate mixed solution and other reagents. However, when the above method is used to erode the grain boundary, on the one hand, picric acid has been listed as an environmental pollutant and its use is restricted in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N21/84G01N1/32
CPCG01N1/32G01N15/0205G01N21/84
Inventor 潘安霞张冯章文超李娄明吴建华
Owner CRRC QISHUYAN INSTITUTE CO LTD
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