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A kind of corrosive agent for nuclear power steel 16mnd5 steel grain size and its corrosion manifestation method

A 16MND5, corrosion display technology, used in particle size analysis, preparation of test samples, particle and sedimentation analysis, etc., can solve the problem of unclear grain size and grain boundary, and achieve clear grain boundary display effect, novel concept, and operation. simple effect

Inactive Publication Date: 2016-06-08
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The corrosion method commonly used in the domestic inspection of 16MND5 steel grain size is that after the sample is ground and polished, it is repeatedly soaked in a mixed solution of saturated picric acid solution and 2 to 10 drops of detergent, each time for 10 minutes to 10 minutes. 20 minutes until grain boundaries are shown, but multiple soaks are required with this method and the grain size grain boundaries are not clear

Method used

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  • A kind of corrosive agent for nuclear power steel 16mnd5 steel grain size and its corrosion manifestation method
  • A kind of corrosive agent for nuclear power steel 16mnd5 steel grain size and its corrosion manifestation method
  • A kind of corrosive agent for nuclear power steel 16mnd5 steel grain size and its corrosion manifestation method

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Embodiment 1

[0027] This embodiment discloses a corrosive agent for nuclear power steel 16MND5 steel grain size, the specific components of the corrosive agent are: picric acid 5g, xylene 50ml, ethanol 5ml, the configuration method of the corrosive agent is first in a beaker with a specification of 100ml Pour in 5ml of ethanol, then pour in 50ml of xylene, and finally put in about 5g of picric acid, and finally stir evenly with a glass rod to obtain the required etchant.

[0028] The invention also discloses a method for developing the corrosion of the above-mentioned corrosive agent. The specific method for developing the corrosion of the 16MND5 steel grain size of nuclear power steel by using the corrosive agent is as follows: grinding and polishing a sample of the 16MND5 steel grain size, and configuring the corrosive agent; Put the polished surface of the prepared grain size sample into the etchant and completely immerse it in the etchant, otherwise increase the etchant until the sample...

Embodiment 2

[0033] In this embodiment, on the basis of the above-mentioned embodiment, the components of the corrosive agent are adjusted, which are 5g of picric acid, 20ml of xylene, and 60ml of ethanol, and are configured according to the method in the above-mentioned embodiment, and then the nuclear power steel 16MND5 steel grain The degree of specific corrosion appearance, the grain boundary effect diagram of the grain size displayed by the corrosion appearance method is as follows image 3 shown.

[0034] Depend on image 3 and figure 2 It can be seen from the comparison that in the case of reducing xylene and increasing ethanol, that is, after etching with 5 g of picric acid, 20 ml of xylene, and 60 ml of ethanol, the corrosion effect of the grain boundary can also be clearly displayed, but compare figure 2 The corrosion effect diagram in the figure is relatively blurred, but it can also meet the requirements of accurately assessing the grain size level of 16MND5 steel for nucl...

Embodiment 3

[0036] In this embodiment, on the basis of the above-mentioned embodiment, the components of the corrosive agent are adjusted, which are 3g of picric acid, 30ml of xylene, and 60ml of ethanol, which are configured according to the method in the above-mentioned embodiment, and then the nuclear power steel 16MND5 steel grain The degree of specific corrosion appearance, the grain boundary effect diagram of the grain size displayed by the corrosion appearance method is as follows Figure 4 shown.

[0037] Depend on Figure 4 It can be seen that after reducing the content of picric acid and increasing the content of xylene and ethanol, that is, picric acid is 3g, xylene is 30ml, and ethanol is 60ml of etchant after corrosion, the grain boundary display effect is also relatively clear, and it can also Accurately and clearly display the corrosion effect of the grain boundary.

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Abstract

The invention discloses a 16MND5 steel grain size corrosive agent for nuclear power steel and a corrosion display method thereof. The corrosive agent comprises picric acid, xylene and ethanol, wherein picric acid is 3-8g, xylene is 20-50ml, and ethanol is 5- 60ml. The corrosion display method includes the following steps: (1) Grinding and polishing the sample; (2) configuring the etchant; (3) completely immersing the sample in the etchant; (4) standing for corrosion for 20 to 40 minutes, Take out the sample; (5) Wash with running cold water and scrub the corrosion marks; (6) After washing, drip alcohol on the corroded surface and dry it; (7) Observe and evaluate the grain size level and grain size morphology of the sample. In the present invention, the ratio of etchant is novel in concept, simple in operation, and focuses on the corrosion display of 16MND5 steel grain size samples. Compared with the original method of corrosion display of etchant, the effect of grain boundary display is clear, which is helpful for accurate evaluation of nuclear power steel 16MND5 steel The grain size level provides favorable conditions for the formulation and optimization of the steel production process.

Description

technical field [0001] The invention relates to the technical field of physical and chemical inspection of nuclear power materials, in particular to a corrosive agent for nuclear power steel 16MND5 steel grain size and a corrosion display method thereof. Background technique [0002] Nuclear power material 16MND5 steel belongs to low-alloy structural steel. According to technical standards, the grain size inspection should be carried out directly in the quenched and tempered heat treatment state. The corrosion method commonly used in the domestic inspection of 16MND5 steel grain size is that after the sample is ground and polished, it is repeatedly soaked in a mixed solution of saturated picric acid solution and 2 to 10 drops of detergent, each time for 10 minutes to 10 minutes. It can vary from 20 minutes until grain boundaries appear, but this method requires multiple soaks, and the grain boundaries of the grain size are not clear. Contents of the invention [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/32G01N15/02
Inventor 王长健
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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