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A method for observing the metallographic structure of pure magnesium

A technology of metallographic structure and pure magnesium, which is applied in the field of microstructure observation of metal materials, can solve the problems of difficult metallographic structure, difficulty in clearly observing the metallographic structure of pure magnesium, and poor corrosion effect, so as to reduce dust pollution and energy consumption , easy to promote and use, and shorten the observation time

Active Publication Date: 2021-01-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion effect of these corrosive agents is not good, the metallographic structure after corrosion is difficult to display, and the metallographic structure of pure magnesium that is difficult to clearly observe,

Method used

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  • A method for observing the metallographic structure of pure magnesium
  • A method for observing the metallographic structure of pure magnesium
  • A method for observing the metallographic structure of pure magnesium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment includes the following steps:

[0025] Step 1. Use 600 sequentially # 、1000 # , 2000 # and 5000 # Silicon carbide sandpaper is used to grind the surface of hot-rolled pure magnesium step by step to obtain a flat, scratched and fine-grained observation plane of hot-rolled pure magnesium; in the step-by-step grinding process, after each replacement of silicon carbide sandpaper, heat The observation plane of rolled pure magnesium is rotated 90° and then ground until the scratches of the previous grinding are removed;

[0026] Step 2. Use the first corrosive agent to etch the hot-rolled pure magnesium observation surface obtained in step 1 once, then rinse with alcohol, and then blow dry with a hair dryer; the first corrosive agent is calculated by volume by 5 parts by mass concentration It is composed of 68% nitric acid and 95 parts of water; the time of the first abrasion is 30s;

[0027] Step 3: Use the second etchant to perform secondary erosion on ...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] Step 1. Use 600 sequentially # 、1000 # , 2000 # and 5000 #Silicon carbide sandpaper is used to grind the surface of as-cast pure magnesium step by step to obtain a flat, scratched and fine-grained observation plane of as-cast pure magnesium; in the step-by-step grinding process, after each replacement of silicon carbide sandpaper, the cast pure magnesium The magnesium observation plane is rotated 90° and then ground until the scratches from the previous grinding are removed;

[0046] Step 2, using the first corrosive agent to scratch the cast pure magnesium observation surface obtained in step 1, then rinse it with alcohol, and then dry it with a hair dryer; the first corrosive agent is calculated by volume by 5 parts by mass concentration. The nitric acid of 68% and the water of 95 parts are formed; The time of described one abrasion is 30s;

[0047] Step 3, using the second corrosive agent to carry out second...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] Step 1. Use 600 sequentially # 、1000 # , 2000 # and 5000 # Silicon carbide sandpaper is used to grind the surface of cast-rolled pure magnesium step by step to obtain a flat, finely scratched pure magnesium observation plane; in the step-by-step grinding process, after each replacement of silicon carbide sandpaper, the cast-rolled pure magnesium The magnesium observation plane is rotated 90° and then ground until the scratches from the previous grinding are removed;

[0053] Step 2. Use the first corrosive agent to etch the cast-rolled pure magnesium observation surface obtained in step 1 once, then rinse with alcohol, and then dry it with a hair dryer; the first corrosive agent is calculated by volume by 5 parts by mass concentration It is composed of 68% nitric acid and 95 parts of water; the time of the first abrasion is 25s;

[0054] Step 3: Use the second etchant to perform secondary erosion on the observa...

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Abstract

The invention discloses a method for observing the metallographic structure of pure magnesium. The method comprises: 1. Using 600 # 、1000 # , 2000 # and 5000 # Grind the surface of pure magnesium step by step with silicon carbide sandpaper to obtain a flat and finely scratched pure magnesium observation plane; 2. Use the first etchant to rub the pure magnesium observation surface once, then rinse it with alcohol, and then use a hair dryer 3. Use the second corrosive agent to perform secondary erosion on the observation surface of pure magnesium after the first abrasion treatment, then rinse with alcohol, and then dry it with a hair dryer; 4. Use a metallographic microscope to examine the dried pure magnesium Magnesium viewing surface for observation. The invention removes sandpaper scratches and dirt on the observation surface of pure magnesium through two-step abrasion treatment, and makes the metallographic structure of pure magnesium appear clearly, thereby accurately reflecting the structure of pure magnesium. The process is simple, easy to control, and is suitable for observation The metallographic structure of various forms of pure magnesium such as cast, cast-rolled, hot-rolled and heat-treated.

Description

technical field [0001] The invention belongs to the technical field of metal material microstructure observation, and in particular relates to a method for observing the metallographic structure of pure magnesium. Background technique [0002] The microstructure of metal materials determines the mechanical and chemical corrosion properties of metal materials. Therefore, using metallographic technology to observe the metallographic structure of the metal can quickly judge the properties of the metal, so that the plastic deformation process and heat treatment process can be adjusted in time. The premise of metallographic observation is to use a suitable chemical etchant to reveal the microstructure. At present, the commonly used corrosive agents for the observation of the metallographic structure of pure magnesium include aqueous solutions of nitric acid and alcohol, aqueous solutions of nitric acid and oxalic acid, and aqueous solutions of nitric acid and ethylene glycol. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N1/32
CPCG01N1/32G01N21/84
Inventor 张伟张于胜霍望图卢金文周宣李宇力马腾飞
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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