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A kind of etchant and corrosion method for displaying aluminum-magnesium alloy metallographic structure

A metallographic structure and aluminum-magnesium alloy technology, which is applied in the field of corrosion showing the metallographic structure of aluminum-magnesium alloys, can solve the problems of excessive corrosion, difficulty in metallographic observation, and incomplete grains, and achieves clearly visible morphology and composition. Simple, Inexpensive Effects

Inactive Publication Date: 2020-05-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aluminum-magnesium alloy belongs to the anti-rust aluminum series, which has good corrosion resistance. It is difficult to corrode the grain boundary with some common chemical methods, and strong acid corrosion is easy to cause incomplete grains or excessive corrosion at the second phase point to cause metallographic difficult to observe
At present, the metallographic preparation of aluminum-magnesium alloys mainly uses NaOH solution or anodic coating with polarizing microscope observation, but the method of anodic coating is too expensive, and it needs to be equipped with a special polarizer for observation, which makes the experiment inconvenient

Method used

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  • A kind of etchant and corrosion method for displaying aluminum-magnesium alloy metallographic structure
  • A kind of etchant and corrosion method for displaying aluminum-magnesium alloy metallographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1. Polish the sample with a size of 10mm×10mm×10mm first, then rinse it with alcohol for 2 minutes and dry it with a hair dryer with cold air;

[0039] Step 2, electrolytic corrosion: Pour 220ml of water, 580ml of sulfuric acid solution with a concentration of 18.4mol / L and 200ml of glycerin into a clean container in sequence at room temperature, and stir until the glycerin is uniform to obtain an electrolytic corrosion agent; mix 80ml of water and 20ml of Pour phosphoric acid with a mass concentration of 85% into a beaker at room temperature and stir evenly to obtain a phosphoric acid solution with a volume fraction of 20%, which is a chemical etchant. Connect the cleaned sample to the positive electrode of the DC power supply, and the stainless steel rod to the negative electrode. Connect, then put the positive and negative electrodes into the electrolytic etchant, turn on the DC power supply to start corrosion, keep the voltage of the DC power supply at 10V, and ...

Embodiment 2

[0042] Step 1. Polish the sample with a size of 10mm×10mm×10mm first, then rinse it with alcohol for 2 minutes and dry it with a hair dryer with cold air;

[0043] Step 2, electrolytic corrosion: Pour 220ml of water, 500ml of sulfuric acid solution with a concentration of 18.4mol / L and 200ml of glycerin into a clean container in turn at room temperature, and stir until the glycerin is uniform to obtain an electrolytic corrosion agent; mix 80ml of water and 20ml of Pour phosphoric acid with a mass concentration of 85% into a beaker at room temperature and stir evenly to obtain a phosphoric acid solution with a volume fraction of 20%, which is a chemical etchant. Connect the cleaned sample to the positive electrode of the DC power supply, and the stainless steel rod to the negative electrode. Connect, then put the positive and negative electrodes into the electrolytic etchant, turn on the DC power supply to start corrosion, keep the voltage of the DC power supply at 15V, and keep...

Embodiment 3

[0046] Step 1. Polish the sample with a size of 10mm×10mm×10mm first, then rinse it with alcohol for 2 minutes and dry it with a hair dryer with cold air;

[0047]Step 2. Electrolytic corrosion: Pour 220ml of water, 520ml of sulfuric acid solution with a concentration of 18.4mol / L and 300ml of glycerin into a clean container at room temperature, and stir until the glycerin is uniform to obtain an electrolytic corrosion agent; mix 80ml of water and 20ml of Pour phosphoric acid with a mass concentration of 85% into a beaker at room temperature and stir evenly to obtain a phosphoric acid solution with a volume fraction of 20%, which is a chemical etchant. Connect the cleaned sample to the positive electrode of the DC power supply, and the stainless steel rod to the negative electrode. Connect, then put the positive and negative electrodes into the electrolytic etchant, turn on the DC power supply to start corrosion, keep the voltage of the DC power supply at 12V, and keep the temp...

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Abstract

The invention discloses a corrosive agent for displaying the metallographic structure of an aluminum-magnesium alloy. The corrosive agent comprises an electrolytic corrosive agent and a chemical corrosive agent, wherein the electrolytic corrosive agent is composed of a sulfuric acid solution having the concentration of 18.4 mol / L, glycerin and water, and the volume ratio of the sulfuric acid solution to the glycerin to the water is 50-58: 20-40: 22; and the chemical corrosive agent is a phosphoric acid solution with the volume fraction of 20%, can make the metallographic structure of the corroded aluminum-magnesium alloy visible under an ordinary optical microscope, and has a good corrosion effect. The invention also discloses a corrosion method for displaying the metallographic structureof the aluminum-magnesium alloy. The method is simple in operation, and can be applied to the preparation of a metallographic specimen of the aluminum-magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metallographic electrolytic corrosion, and in particular relates to an etchant for displaying the metallographic structure of an aluminum-magnesium alloy, and also relates to a corrosion method for displaying the metallographic structure of the aluminum-magnesium alloy. Background technique [0002] The characteristics of low density, high tensile strength and high elongation of aluminum-magnesium alloy make it widely used in industrial fields, especially aerospace, ship and warship manufacturing fields, including mechanical handles, aircraft fuel tank conduits, large hull structural parts, etc. [0003] Aluminum-magnesium alloy belongs to the anti-rust aluminum series, which has good corrosion resistance. It is difficult to corrode the grain boundary with some common chemical methods, and strong acid corrosion is easy to cause incomplete grains or excessive corrosion at the second phase point to cause met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04C23F1/20G01N1/32
CPCC23F1/20C25F3/04G01N1/32
Inventor 李言杨笑宇杨明顺李嘉伟姚志远
Owner XIAN UNIV OF TECH
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