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Rare earth magnesium alloy metallographic corrosive agent and metallographic sample preparation method thereof

A metallographic sample, rare earth magnesium technology, applied in the preparation of test samples, etc., can solve the problems of excessive corrosion of rare earth magnesium alloy samples, poor corrosion effect of rare earth magnesium alloys, and affecting the quality of metallographic micrographs, etc., to achieve Prevent the metallographic sample from being scrapped, reduce the time for repeated sample copying, and reduce the cost

Pending Publication Date: 2022-04-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hard-won rare earth magnesium alloy samples are extremely prone to excessive corrosion during corrosion, forming an oxide layer on the surface that is difficult to clean, affecting the quality of metallographic micrographs
In the past, picric acid was often used by those skilled in the art as a metallographic etchant to corrode rare-earth magnesium series alloys, which can clearly display the grain boundaries. However, picric acid has been discontinued due to its high risk and involving flammable and explosive substances.
In the past, some magnesium alloy corrosive agents had poor corrosion effects on the processed rare earth magnesium alloys, and could not corrode the grain boundaries.

Method used

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  • Rare earth magnesium alloy metallographic corrosive agent and metallographic sample preparation method thereof
  • Rare earth magnesium alloy metallographic corrosive agent and metallographic sample preparation method thereof
  • Rare earth magnesium alloy metallographic corrosive agent and metallographic sample preparation method thereof

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preparation example Construction

[0036] In another aspect of the present invention, the present invention provides a method for preparing a rare earth magnesium alloy metallographic sample using the rare earth magnesium alloy metallographic etchant of the present invention, comprising:

[0037] (1) Preparation: Take a sample, cut the sample into thin slices of appropriate size, put the surface to be observed for metallography facing outward, and paste the reverse side on the balance grinding table; samples with irregular shapes can be hot-mounted with a mounting machine.

[0038] (2) Grinding: Use a grinding and polishing machine to polish the sample. Due to the low hardness of the rare earth magnesium alloy, use water sandpaper with a particle size of 800 to polish the surface oxide layer, and then grind with water sandpaper with a particle size of 1500, 3000, and 5000 in turn. After each sandpaper is replaced, the sanding direction is rotated 90 degrees, and after the scratches in the sanding direction of th...

Embodiment 1

[0048] The composition of the rare earth magnesium alloy metallographic etchant of this embodiment is as follows: 1.5 ml of nitric acid, 0.5 ml of glacial acetic acid, 1.5 g of oxalic acid, and 98 ml of deionized water.

[0049] Using the metallographic etchant mentioned above, the as-cast and extruded ZE62 rare earth magnesium alloy samples were respectively prepared, and the corrosion time was 12s. The obtained ZE62 magnesium alloy metallographic samples are shown in Figure 2(a) and Figure 2(b). It can be seen that both samples have clear grain outlines, but at the same time, the surface is somewhat oxidized and yellowed, and the grain boundaries are precipitated There are also many things.

Embodiment 2

[0051] The composition of the rare earth magnesium alloy metallographic etchant in this embodiment is as follows: 1 ml of nitric acid, 1 ml of glacial acetic acid, 1 g of oxalic acid, and 98 ml of deionized water.

[0052] Using the metallographic etchant mentioned above, ZE62 rare earth magnesium alloy samples in cast state and extruded state were respectively prepared, and the corrosion time was 15s. The obtained ZE62 magnesium alloy metallographic samples are shown in Figure 3(a) and Figure 3(b). It can be seen that the metallographic structure of the two samples is obvious, the crystal plane is clean, the grain boundary is clear, and the corrosion effect is good .

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Abstract

The invention discloses a rare earth magnesium alloy metallographic corrosive agent and a metallographic sample preparation method thereof. The metallographic corrosive agent comprises oxalic acid, glacial acetic acid, nitric acid and deionized water. By using the corrosive agent, a high-quality magnesium-zinc-rare earth alloy metallographic picture with a clear grain boundary can be obtained, which is the most basic work for analyzing the grain size, and great help is provided for further research and analysis of subsequent alloy structures and physical and chemical properties. In addition, the corrosive agent is easy to obtain raw materials, simple to prepare, low in cost, easy to store, free of flammable and explosive hazards in laboratories and convenient to widely use.

Description

technical field [0001] The invention belongs to the field of metallographic sample preparation, and in particular relates to a rare earth magnesium alloy metallographic etchant and a method for preparing a metallographic sample. Background technique [0002] The rare earth magnesium alloy system has high strength, high plasticity and high thermal conductivity, and is widely used in the fields of aerospace, automobile industry and electronic devices. In addition, due to its excellent mechanical properties, elastic modulus close to that of human bone, good biocompatibility and unique bone-promoting properties, it can be implanted into the human body as a fracture screw, and is considered to be the best candidate for new biodegradable biomedical materials. One of the best options. As we all know, the properties of alloys are greatly affected by the internal microstructure. In order to improve the physical and chemical properties of alloys, it is often necessary to effectively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/34
CPCG01N1/28G01N1/32G01N1/34
Inventor 房大庆吴颖张晓茹周玉美薛德祯丁向东孙军
Owner XI AN JIAOTONG UNIV
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