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High aluminum zinc alloy etching agent and use method thereof

An etchant and zinc alloy technology, applied in the field of metallographic sample preparation, can solve problems such as over-corrosion, difficulty in displaying grain boundaries, and difficulty in microstructure analysis, and achieve the effect of clear and easy-to-distinguish grain boundaries

Inactive Publication Date: 2010-11-10
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the solution-treated high-aluminum-zinc alloy, it is difficult to show the grain boundary and prone to over-corrosion with the above-mentioned etchant, which makes it difficult to analyze its microstructure

Method used

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  • High aluminum zinc alloy etching agent and use method thereof
  • High aluminum zinc alloy etching agent and use method thereof
  • High aluminum zinc alloy etching agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] [Sample] High aluminum zinc alloy

[0025] [Processing state] As cast

[0026] [Formulation and process parameters]

[0027] Nitric acid (mass fraction: 68%) 2ml

[0028] Hydrochloric acid (mass fraction: 38%) 4ml

[0029] Glacial acetic acid (mass fraction: 99%) 8ml

[0030] Deionized water 10ml

[0031] Anhydrous ethanol (mass fraction: 99.5%) 76ml

[0032] Picric acid 2g

[0033] Corrosion time 3 seconds

[0034] Temperature room temperature

[0035] Take a 200ml glass beaker, first add the above metered absolute ethanol into the beaker, then add picric acid, hydrochloric acid, nitric acid, glacial acetic acid and deionized water according to the above metered amount, mix and stir evenly.

[0036] [Processing Procedure]

[0037] (1) Polishing: After rough grinding and fine grinding, the high-aluminum-zinc alloy samples are polished on a metallographic polishing machine. The polishing material used is a diamond spray polishing agent and anhydrous ethanol is added to assist polishing.

...

Embodiment 2

[0043] [Sample] Same as Example 1

[0044] [Processing state] Solution treatment

[0045] [Formulation and process parameters]

[0046] Nitric acid (mass fraction: 65%) 2ml

[0047] Hydrochloric acid (mass fraction: 36%) 4ml

[0048] Glacial acetic acid (mass fraction: 99%) 8ml

[0049] Distilled water 10ml

[0050] Anhydrous ethanol (mass fraction: 99.5%) 76ml

[0051] Picric acid 2g

[0052] Corrosion time 3 seconds

[0053] Temperature room temperature

[0054] Take a 200ml glass beaker, first add the above-mentioned metered absolute ethanol into the beaker, then add picric acid, hydrochloric acid, nitric acid, glacial acetic acid and distilled water according to the above-mentioned meter, mix and stir evenly.

[0055] [Processing Procedure] Same as Example 1

Embodiment 3

[0057] [Sample] Same as Example 1

[0058] [Processing state] Solution treatment

[0059] [Formulation and process parameters]

[0060] Nitric acid (mass fraction: 65%) 2ml

[0061] Hydrochloric acid (mass fraction: 36%) 3ml

[0062] Glacial acetic acid (mass fraction: 99%) 10ml

[0063] Deionized water 10ml

[0064] Anhydrous ethanol (mass fraction: 99.5%) 75ml

[0065] Picric acid 3g

[0066] Corrosion time 5 seconds

[0067] Temperature room temperature

[0068] Take a 200ml glass beaker, first add the above metered absolute ethanol into the beaker, then add picric acid, hydrochloric acid, nitric acid, glacial acetic acid and deionized water according to the above metered amount, mix and stir evenly.

[0069] [Processing Procedure] Same as Example 1

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PUM

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Abstract

The invention relates to a high aluminum zinc alloy etching agent, which can be used for preparing the metallurgical sample of cast and solution treated high aluminum zinc alloy, and is especially suitable for the high aluminum zinc alloy modified by adding zirconium, rare earth and the like. The etching agent comprises hydrochloric acid, nitric acid, glacial acetic acid, picric acid, anhydrous ethanol and water. The corrosion method of the metallic phase of high aluminum zinc alloy using the etching agent is as follows: (1) corrosion, the high aluminum zinc alloy sample after grinding and polishing treatment is immersed in the etching agent at a temperature of 15-30 DEG C, is corroded for 3-15 seconds under the swing condition and taken out; (2) cleaning, the high aluminum zinc alloy sample taken out of the etching agent is immersed in the anhydrous ethanol, and is taken out after ultrasonic cleaning; and (3) drying, the cleaned high aluminum zinc alloy sample is dried by cold wind at room temperature. The metallurgical etching agent of the invention is adopted, so that the metallurgical structure grain boundary is clear, and a second phase is easy to distinguish; and the etching agent has the advantages of short corrosion time of the sample, simple preparation process of the etching agent and the like.

Description

Technical field [0001] The invention belongs to the field of metallographic sample preparation, and relates to a high-aluminum-zinc alloy etching agent and a method of use thereof. It can be used for the preparation of metallographic samples of high-aluminum-zinc alloys in as-cast and solution-treated states, and is particularly suitable for adding zirconium and rare earth High-aluminum-zinc alloy with other modification treatments. Background technique [0002] High-aluminum zinc alloy is a new type of gravity casting non-ferrous alloy that has been rapidly developed in recent years. Among them, ZA27 is the highest strength cast aluminum-zinc alloy. It has many excellent characteristics, such as low density, high ultimate tensile strength, good wear resistance, good load-bearing ability, moderate thermal and electrical conductivity, non-magnetic, and no sparks during collision. At present, ZA27 alloy has become an excellent substitute for wear-resistant materials such as coppe...

Claims

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Application Information

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IPC IPC(8): C23F1/20G01N1/32
Inventor 李坊平于文斌李养良秦兵
Owner SOUTHWEST UNIVERSITY
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