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A kind of etchant for displaying metallographic structure of cast magnesium alloy and its preparation method and application

A technology for casting magnesium alloy and metallographic structure, which is applied in the field of metallographic inspection of casting magnesium alloy, can solve the problems of long erosion time and achieve the effects of short erosion time, clearly visible grain boundaries, and easy observation of microstructure

Inactive Publication Date: 2019-05-17
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an etchant for displaying the metallographic structure of cast magnesium alloys, so as to solve the technical problems of eroding the substrate and long erosion time caused by too strong or too weak acidity of the magnesium alloy etchant in the prior art

Method used

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  • A kind of etchant for displaying metallographic structure of cast magnesium alloy and its preparation method and application
  • A kind of etchant for displaying metallographic structure of cast magnesium alloy and its preparation method and application
  • A kind of etchant for displaying metallographic structure of cast magnesium alloy and its preparation method and application

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Embodiment 1

[0030] This embodiment shows that the etchant for the metallographic structure of cast magnesium alloys consists of the following volume components: 6ml of lactic acid with a purity of 99%, 2ml of phosphoric acid with a mass fraction of 85%, 10ml of glycerin with a purity of 99.7%, and a mass fraction of 75ml of 99.7% absolute ethanol, 7ml of distilled water with a purity of 99.99%.

[0031] This embodiment shows the preparation method of the etchant for the metallographic structure of cast magnesium alloy, comprising the following steps:

[0032] 1) Mix 10ml of glycerin and 75ml of absolute ethanol, stir evenly to obtain the mixture A;

[0033] 2) Add 6ml of lactic acid and 2ml of phosphoric acid to mixture A in sequence, and stir evenly to obtain mixture B;

[0034] 3) Add 7ml of distilled water to the mixed solution B to dilute it.

[0035] The application of the above-mentioned etchant in this embodiment in displaying the metallographic structure of cast magnesium alloys...

Embodiment 2

[0042] This embodiment shows that the etchant for the metallographic structure of cast magnesium alloys consists of the following volume components: 4 ml of lactic acid with a purity of 99%, 4 ml of phosphoric acid with a mass fraction of 85%, 5 ml of glycerin with a purity of 99.7%, and a mass fraction of 99.7 80ml of absolute ethanol, 7ml of distilled water with a purity of 99.99%.

[0043] This embodiment shows the preparation method of the etchant for the metallographic structure of cast magnesium alloy, comprising the following steps:

[0044] 1) Mix 5ml of glycerin and 80ml of absolute ethanol and stir evenly to obtain a mixture A;

[0045] 2) Add 4ml of lactic acid and 4ml of phosphoric acid to mixture A in sequence, and stir evenly to obtain mixture B;

[0046] 3) Add 7ml of distilled water to the mixed solution B to dilute it.

[0047] The application of the above-mentioned etchant obtained in this embodiment in displaying the metallographic structure of cast magnes...

Embodiment 3

[0054] This embodiment shows that the etchant for the metallographic structure of cast magnesium alloys consists of the following volume components: 2 ml of lactic acid with a purity of 99%, 6 ml of phosphoric acid with a mass fraction of 85%, 15 ml of glycerin with a purity of 99.7%, and a mass fraction of 70ml of 99.7% absolute ethanol, 7ml of distilled water with a purity of 99.99%.

[0055] This embodiment shows the preparation method of the etchant for the metallographic structure of cast magnesium alloy, comprising the following steps:

[0056] 1) Mix 15ml of glycerin and 70ml of absolute ethanol and stir evenly to obtain a mixture A;

[0057] 2) Add 2ml of lactic acid and 6ml of phosphoric acid to mixture A in sequence, and stir evenly to obtain mixture B;

[0058]3) Add 7ml of distilled water to the mixed solution B to dilute it.

[0059] The application of the above-mentioned etchant obtained in this embodiment in displaying the metallographic structure of cast magn...

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Abstract

The invention relates to an aggressive agent for displaying a metallographic structure of a casting magnesium alloy and a preparation method and application of the aggressive agent and belongs to the technical field of inspection of metallographic structures of casting magnesium alloys. The aggressive agent for displaying the metallographic structure of the casting magnesium alloy comprises the following components of, by volume, 2-6 parts of lactic acid, 2-6 parts of phosphoric acid, 5-15 parts of glycerinum, 70-80 parts of ethyl alcohol and 7 parts of water. According to the aggressive agent for displaying the metallographic structure of the casting magnesium alloy, the organic faintly-acid lactic acid and the inorganic medium-strong-acid phosphoric acid are jointly acted so that a precipitated phase at an alloy crystal boundary can be effectively eroded, and thus the magnesium alloy crystal boundary can be clearly displayed.

Description

technical field [0001] The invention relates to an etchant for displaying the metallographic structure of cast magnesium alloys, a preparation method and application thereof, and belongs to the technical field of metallographic inspection of cast magnesium alloys. Background technique [0002] For cast magnesium alloys, the microstructure is closely related to its mechanical properties and corrosion resistance, so the research and development of cast magnesium alloys cannot be separated from the observation of its microstructure. Due to the advantages of easy operation, low cost, and wide field of view, optical metallography is considered to be an important means to obtain basic information of alloy microstructure and grasp the change of alloy structure in a large range. [0003] Due to the different components of cast magnesium alloys and different treatment states, the microstructure of the alloys will also be different. In addition, because cast magnesium alloys are easil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/22G01N1/32
CPCC23F1/22G01N1/32
Inventor 李全安陈晓亚陈君关海昆王颂博张帅张清朱利敏李志涛
Owner HENAN UNIV OF SCI & TECH
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