A metallographic etchant for extruded magnesium-lithium alloy and its application method

A magnesium-lithium alloy and metallographic corrosion technology, which is applied in the field of metallographic etchants for extruded magnesium-lithium alloys, can solve the problems of poor corrosion resistance of magnesium-lithium alloys, ambiguous metallographic structure, difficult to observe and analyze, etc. Clear and identifiable grain boundaries, clear and complete metallographic structure

Active Publication Date: 2019-01-04
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the prior art, the commonly used metallographic etchant is mainly composed of nitric acid, sulfuric acid and water, but this metallographic etchant has strong corrosiveness, and the corrosion resistance of magnesium-lithium alloy is very poor, so the existing metallographic etchant is used The etching of magnesium-lithium alloys by phase corrosive agents is not only difficult to control the etching time accurately, but also makes the metallographic structure blurred and difficult to observe and analyze.

Method used

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  • A metallographic etchant for extruded magnesium-lithium alloy and its application method

Examples

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Embodiment 1

[0023] A metallographic corrosive agent for an extruded magnesium-lithium alloy is formed by uniformly mixing 20 ml of glacial acetic acid with a mass fraction of 98%, 20 ml of picric acid with a mass fraction of 50%, and 60 ml of ethanol with a mass fraction of 98%.

[0024] Specifically, at room temperature, use a plastic straw to suck the metallographic corrosive of the extruded magnesium-lithium alloy described in Example 1 of the present invention, and drop it onto the polished surface of the extruded magnesium-lithium alloy A for metallography. Corrosion, the metallographic corrosion time is 5-15s, then clean the eroded extruded magnesium-lithium alloy A with clean water, and use a cotton ball dipped in absolute ethanol to clean the surface of the extruded magnesium-lithium alloy A Wipe, and then use a hair dryer to dry the surface, so that the extruded magnesium-lithium alloy A can be metallographically corroded. The metallographic structure of the extruded magnesium-lithi...

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Abstract

The invention discloses a metallographic corrosive agent for an as-extruded Mg-Li alloy and a using method of the metallographic corrosive agent. The metallographic corrosive agent is prepared by mixing 98% by mass of glacial acetic acid, 50% by mass of picric acid and 98% by mass of ethyl alcohol, and preferably the volume ratio of glacial acetic acid to picric acid to ethyl alcohol is 20:20:60, so that metallographic corrosion of the as-extruded Mg-Li alloy can be finished conveniently and fast, and the as-extruded Mg-Li alloy subjected to metallographic corrosion has the clearest and most complete metallographic structure and clear and distinguishable grain boundaries, which is conducive to observing and analyzing the metallographic structure.

Description

Technical field [0001] The invention relates to the field of metallographic corrosion of magnesium-lithium alloys, in particular to a metallographic corrosion agent for extruded magnesium-lithium alloys and a method of use thereof. Background technique [0002] Magnesium-lithium alloy is the lightest metal material used in actual industrial production, and it has the characteristics of high specific strength, high specific rigidity, and good cutting performance. Therefore, it is widely used in many fields such as electronics, aerospace, national defense and military industry. . [0003] The extruded magnesium-lithium alloy is the most commonly used magnesium-lithium alloy. Due to the different material composition, extrusion strength and heat treatment process used in the processing, the metallographic structure of the extruded magnesium-lithium alloy is very different, which makes the performance of the extruded magnesium-lithium alloy appear Huge difference. In order to be abl...

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 陈飞张玉林于佩航韦银河陈佳欣
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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