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A kind of magnesium alloy metallographic etchant

A technology of corrosive agent and magnesium alloy, which is applied in the field of metallographic test of magnesium alloy, can solve the problems of poor corrosion resistance, blurred surface, and difficult identification of the second phase of magnesium alloy, achieve accurate corrosion time, good effect, and shorten corrosion time Effect

Inactive Publication Date: 2017-12-08
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Metallographic corrosion agents for magnesium alloys in the prior art are usually composed of nitric acid, hydrochloric acid, and water. Because this corrosion agent is highly corrosive, the corrosion resistance of magnesium alloys is very poor. Therefore, during the corrosion process, the crystals of the alloy boundary is difficult to clearly show
Moreover, the corrosion time of magnesium alloys in the corrosion process is very difficult to accurately control. If the time is too short, the grain boundaries will be difficult to clean and display. If the corrosion time is too long, a layer of oxide film that is difficult to remove will be formed on the surface of the metallographic sample. The surface is blurred and the second phase is difficult to identify, which has a serious impact on the observation and analysis of the metallographic structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The magnesium alloy metallographic etchant of this embodiment is composed of the following components: 1 mL of nitric acid with a concentration of 68% by mass, 15 g of oxalic acid, 4 mL of acetic acid with a concentration of 98% by mass, and 100 mL of ethanol.

[0016] Add 100mL of ethanol into a beaker, add 1mL of nitric acid with a concentration of 68% by mass, 15g of oxalic acid, and 4mL of acetic acid with a concentration of 98% by mass, stir and mix evenly to obtain a magnesium alloy metallographic etchant.

[0017] Immerse the polished magnesium alloy sample in the magnesium alloy metallographic etchant prepared above, etch for 5 seconds, take it out, wash it with ethanol, and dry it in the air to obtain the corroded magnesium alloy sample.

Embodiment 2

[0019] The magnesium alloy metallographic etchant of this embodiment is composed of the following components: 2 mL of nitric acid with a concentration of 68% by mass, 12 g of oxalic acid, 3 mL of acetic acid with a concentration of 98% by mass, and 100 mL of ethanol.

[0020] Add 100mL of ethanol into a beaker, add 2mL of nitric acid with a concentration of 68% by mass, 12g of oxalic acid, and 3mL of acetic acid with a concentration of 98% by mass, stir and mix evenly to obtain a magnesium alloy metallographic etchant.

[0021] The polished magnesium alloy sample was immersed in the prepared magnesium alloy metallographic etchant, etched for 7s, taken out, rinsed with ethanol, and dried in air to obtain the corroded magnesium alloy sample.

Embodiment 3

[0023] The magnesium alloy metallographic etchant of this embodiment is composed of the following components: 3 mL of nitric acid with a concentration of 68% by mass, 10 g of oxalic acid, 2 mL of acetic acid with a concentration of 98% by mass, and 100 mL of ethanol.

[0024] Add 100mL of ethanol into a beaker, add 3mL of nitric acid with a concentration of 68% by mass, 10g of oxalic acid, and 2mL of acetic acid with a concentration of 98% by mass, stir and mix evenly to obtain a magnesium alloy metallographic etchant.

[0025] The polished magnesium alloy sample was immersed in the prepared magnesium alloy metallographic etchant, etched for 10 seconds, taken out, rinsed with ethanol, and dried with filter paper to obtain the corroded magnesium alloy sample.

[0026] The corrosion time of the magnesium alloy metallographic etchant of the present invention is short, and the corrosion time of using the magnesium alloy metallographic etchant of the present invention only needs 5-1...

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Abstract

The invention relates to a magnesium alloy metallographic corrosive agent and belongs to the technical field of magnesium alloy metallographic tests. The magnesium alloy metallographic corrosive agent is composed of oxalic acid and the following components including, by size, 1-3 parts of nitric acid with the concentration being 68%, 2-4 parts of acetic acid with the mass percent concentration being 98% and 100 parts of ethyl alcohol; and 10-15 g of the oxalic acid is adopted for every 100 ml of the ethyl alcohol. The magnesium alloy metallographic corrosive agent can fast and effectively corrode magnesium alloy, and corrosive time can be accurately controlled.

Description

technical field [0001] The invention relates to a magnesium alloy metallographic corrosion agent, which belongs to the technical field of magnesium alloy metallographic testing. Background technique [0002] As the lightest metal material in practical applications, magnesium alloy has the characteristics of low density, high specific strength, high specific stiffness, and good cutting performance. It has irreplaceable advantages of other materials and has been widely used in many fields. [0003] Due to the difference in material composition and heat treatment process, different types of magnesium alloy structures are often obtained, which leads to differences in the properties of the final alloy. In order to obtain the required magnesium alloy, it is necessary to observe the metallographic structure of the alloy during the research and production of the magnesium alloy, and combine the performance test data to adjust the alloy composition and heat treatment process in time....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/22
Inventor 张清陈君李全安李萍朱利敏张兴渊
Owner HENAN UNIV OF SCI & TECH
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