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Metallographical corrosive for medium entropy high-temperature alloy and corrosion method

A high-temperature alloy and corrosive agent technology, which is applied in the preparation of test samples, instruments, and analytical materials, etc., can solve the problems of metallographic inspection difficulties, no corrosive agents and corrosion methods, etc., and achieve the effect of simple operation

Active Publication Date: 2020-04-21
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Medium-entropy superalloys have very strong corrosion resistance, and metallographic examination is very difficult
So far, no mature etchant and corrosion method for metallographic samples of medium-entropy superalloys have appeared

Method used

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  • Metallographical corrosive for medium entropy high-temperature alloy and corrosion method
  • Metallographical corrosive for medium entropy high-temperature alloy and corrosion method
  • Metallographical corrosive for medium entropy high-temperature alloy and corrosion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper grinding should completely cover the grinding marks of the previous sandpaper, and the polishing machine will polish it. . Sample corrosion: Mix 5g of copper sulfate, 15ml of hydrochloric acid, 10ml of water, 2g of ferric chloride, and 2ml of nitric acid to make a corrosive agent, put the sample into the corrosive agent, the stainless steel plate is the cathode, the sample is the anode, and the electrolysis voltage is 1.5V , the current is 0.1A, and the electrolytic corrosion time is 60s. After the sample is taken out, it is cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

Embodiment 2

[0021] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper should completely cover and remove the grinding marks of the previous sandpaper. polishing. Sample corrosion: Mix 10g of copper sulfate, 30ml of hydrochloric acid, 25ml of water, 3g of ferric chloride, and 4ml of nitric acid to make a corrosion agent. The stainless steel plate is used as the cathode, and the sample is used as the anode. The electrolytic voltage is 5V, the current is 0.3A, and the electrolytic corrosion time After 20 seconds, the sample was cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

Embodiment 3

[0023] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper should completely cover and remove the grinding marks of the previous sandpaper. polishing. Sample corrosion: Mix 7g of copper sulfate, 20ml of hydrochloric acid, 20ml of water, 2g of ferric chloride, and 2ml of nitric acid to make a corrosion agent. The stainless steel plate is the cathode, and the sample is the anode. The electrolytic voltage is 3V, the current is 0.2A, and the electrolytic corrosion time After 30s, the sample was taken out and cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

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Abstract

The invention relates to a metallographical corrosive for a medium entropy high-temperature alloy and a corrosion method and belongs to the technical field of metal functional materials. The corrosiveis prepared by mixing 5-10 g of copper sulfate, 15-30 ml of hydrochloric acid, 10-25 ml of water, 2-3 g of ferric chloride and 2-4 ml of nitric acid. The corrosion method comprises the following steps of putting a test sample in the corrosive for electrolytic corrosion, wherein a stainless steel plate is taken as a cathode, the test sample as an anode, the electrolytic voltage is 1.5-5 V, the electrolytic current is 0.1-0.3 A and electrolytic time is 20-60 s; and taking out the sample, cleaning the sample with alcohol, blow-drying the sample, and observing microstructures of the sample under a microscope. The corrosive has the advantages that microstructure and morphology of the medium entropy high-temperature alloy can be corroded relatively clearly, and the method is simple and feasible. The corrosive is suitable for displaying microstructure and morphology of the medium entropy high-temperature alloy with various components.

Description

technical field [0001] The invention belongs to the technical field of metal functional materials, and in particular relates to a medium-entropy high-temperature alloy metallographic etchant and a corrosion method for observing the grain size and shape distribution of the medium-entropy high-temperature alloy. It is suitable for corroding medium-entropy superalloys in different composition states, showing alloy microstructures in various compositions and states. [0002] technical background [0003] Medium-entropy superalloys have excellent tensile strength and fracture toughness, and the alloy has higher yield strength and comparable ductility than many common TWIP steels. Therefore, in recent years, the medium-entropy superalloy, which is based on the addition of Al, Ti, and Ta elements for aging strengthening, has been more and more widely used. [0004] The technological performance and serviceability of metal materials are determined by the internal structure of the me...

Claims

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Application Information

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IPC IPC(8): C23F1/16G01N1/28G01N1/32
CPCC23F1/16G01N1/286G01N1/32
Inventor 曹青安宁
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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