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Magnesium alloy etching agent and using method thereof

An etchant and magnesium alloy technology, applied in the field of magnesium alloy etchant and its application method, can solve problems such as corrosion surface oxidation, etchant failure, corrosion samples, etc., to ensure brightness, stability, and brightness good brightness effect

Active Publication Date: 2009-07-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of new magnesium alloys, especially the research and development of magnesium alloys containing rare earths, these etchants are limited in function, cannot corrode samples well, clearly show the microstructure of alloys, and rare earths contain special After the heat treatment of heavy rare earth magnesium alloys, these etchants are used for corrosion, and it is very easy for the etchant to fail or the corroded surface oxidizes quickly after etching, and the structure cannot be observed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Magnesium alloy etchant, the composition of which contains

[0023] Diethylene glycol ether: 50ml,

[0024] Nitric acid: 2.0ml,

[0025] Acetic acid: 21ml,

[0026] Water: 25ml,

[0027] Oxidized brightener HF: 2ml;

[0028] For magnesium alloys without heat treatment, the alloy sample is corroded by etching method, that is, after the sample is roughly ground, finely ground, and polished, the moisture on the surface of the sample is dried, the sample is clamped with tweezers, and the polished surface is soaked in the etchant. During the corrosion process, shake the sample slightly to remove the bubbles and corrosion products attached to the surface of the sample. The corrosion time is about 60sec. Take out the sample and rinse it quickly with tap water, distilled water or deionized water to remove the etchant and corrosion on the surface. After the product is dried with natural wind.

[0029] The surface of the corroded sample is not easily oxidized, has good brigh...

Embodiment 2

[0031] Magnesium alloy etchant, the composition of which contains

[0032] Ethylene glycol: 59.5ml,

[0033] Nitric acid: 0.5ml,

[0034] Acetic acid: 27ml,

[0035] Water: 10ml;

[0036] Oxidized brightener HF: 3ml;

[0037] For rare earth magnesium alloys heat-treated at low temperature and short time, the alloy samples are corroded by etching method, that is, after the samples are coarsely ground, finely ground, and polished, the moisture on the surface of the samples is dried, the samples are clamped with tweezers, and the polished surface is soaked in In the etchant, shake the sample slightly during the corrosion process to remove the bubbles and corrosion products attached to the surface of the sample. The corrosion time is about 90sec. Take out the sample and rinse it quickly with tap water, distilled water or deionized water to wash away the corrosion on the surface After removing the agent and corrosion products, let it dry with natural wind.

[0038] The surface...

Embodiment 3

[0040] Magnesium alloy etchant, the composition of which contains

[0041] Ethylene glycol: 70ml,

[0042] Nitric acid: 1.0ml,

[0043] Acetic acid: 12ml,

[0044] Water: 15ml;

[0045] Oxygenated brightener HF: 2ml

[0046] The operating conditions are the same as in Example 1. The surface of the corroded sample is not easily oxidized, has good brightness, and the microstructure of the alloy can be clearly observed.

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Abstract

A magnesium alloy etchant and a method for using the same, relate to a microstructure etchant for magnesium alloys, in particular to magnesium alloys, especially heat-treated rare earth magnesium alloys used to corrode samples during metallographic analysis, Etchant exhibiting microstructure and method of use of the etchant. It is characterized in that its composition: (a) contains at least one kind of ethylene glycol or diethylene glycol ether; (b) the basic oxidizing acid is acetic acid; (c) the auxiliary oxidizing agent and polishing agent are concentrated nitric acid; (d) contains An oxidative brightener. The etchant proposed by the invention is not only suitable for magnesium alloys without heat treatment, but also suitable for magnesium alloys that have been heat-treated at high and low temperatures for a long time, especially magnesium alloys containing rare earths, and the surface of the corroded samples is not easy to oxidize and has high brightness .

Description

technical field [0001] A magnesium alloy etchant and a method for using the same, relate to a microstructure etchant for magnesium alloys, in particular to magnesium alloys, especially heat-treated rare earth magnesium alloys used to corrode samples during metallographic analysis, Etchant exhibiting microstructure and method of use of the etchant. technical background [0002] As the lightest metal structural material in practical application, magnesium alloy has the characteristics of low density, high specific strength and rigidity, good shock absorption performance, machinability and recyclability, and has many irreplaceable characteristics and advantages of other materials. It meets people's requirements for energy conservation and environmental protection, and has been widely used in aerospace, national defense and military industries. In recent years, with the decline in production costs and the continuous expansion of application fields, the application of magnesium a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/22C23F3/02G01N1/32
Inventor 姚素娟梁冬梅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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