Metallographic corrosive agent for extruded magnesium-lithium alloy and method for using metallographic corrosive agent for extruded magnesium-lithium alloy

Abstract

The invention discloses a metallographic corrosive agent for an extruded magnesium-lithium alloy and a method for using the metallographic corrosive agent for the extruded magnesium-lithium alloy. The metallographic corrosive agent for the extruded magnesium-lithium alloy is prepared by mixing the following components in percentages by mass: 40 percent of hydrofluoric acid, 60 percent of citric acid and 98 percent of ethanol; moreover, the volume ratio of the hydrofluoric acid to the citric acid to the ethanol is most preferably 40: 20: 40; thus, the metallographic corrosion of the extruded magnesium-lithium alloy can be completed conveniently and quickly; moreover, the metallographic structure of the extruded magnesium-lithium alloy subjected to the metallographic corrosion is clearest and most complete; crystal boundaries are clear and discernible; and in this way, the observation and the analysis of the metallographic structure are facilitated.

Description

technical field [0001] The invention relates to the field of metallographic corrosion of magnesium-lithium alloys, in particular to a metallographic etchant for extruded magnesium-lithium alloys and a method for using the same. 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 stiffness, and good cutting performance, so it is widely used in many fields such as electronic appliances, aerospace, national defense and military industry . [0003] 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 process, there are great differences in the metallographic structure of the processed extruded magnesium-lithium alloy, which makes the properties of the extruded magnesium-lithium alloy appear differ...

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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.

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