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Electrolytic corrosive agent and corrosion method for displaying metallographic structure of high-purity aluminum

A metallographic structure and electrolytic corrosion technology, applied in the field of metallographic electrolytic corrosion, can solve the problems of high experimental cost, poor display effect, and poor versatility, and achieve the effect of cheap price, simple composition, and convenient preparation

Inactive Publication Date: 2017-07-28
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 104006994A discloses a method for displaying the color metallographic structure of pure aluminum. It proposes to prepare metallographic samples by mechanical polishing + vibration polishing + anode coating, and to use a polarizing microscope to observe the metallographic structure. The steps are relatively complicated and require Professional vibrating polisher and polarizing microscope, the cost of the experiment is high, and the versatility is not strong
Both are less effective in displaying adjacent grain structures with the same orientation

Method used

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  • Electrolytic corrosive agent and corrosion method for displaying metallographic structure of high-purity aluminum
  • Electrolytic corrosive agent and corrosion method for displaying metallographic structure of high-purity aluminum
  • Electrolytic corrosive agent and corrosion method for displaying metallographic structure of high-purity aluminum

Examples

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Effect test

Embodiment 1

[0024] An electrolytic etchant and a corrosion method for displaying the metallographic structure of 6N high-purity aluminum include the following steps:

[0025] (1) Surface cleaning of the sample before electrolytic corrosion: Rinse the polished sample with alcohol, the size of the sample is 16mm×18mm×5mm, and dry it with a hair dryer with cold air to ensure that the surface of the sample is free of dust and other pollutants;

[0026] (2) Preparation of electrolytic etchant: the composition of the etchant includes 18ml of hydrogen fluoride solution, 2.6g of boric acid, and 200ml of distilled water with a volume fraction of 40%. Pour distilled water, hydrogen fluoride solution, and boric acid into a clean container successively at room temperature, and stir until the boric acid Dissolve completely, and use after standing at a temperature lower than room temperature (20°C) for 20 minutes;

[0027] (3) Electrolytic corrosion: Turn on the DC power supply, adjust the voltage to 8...

Embodiment 2

[0031] An electrolytic etchant and a corrosion method for displaying the metallographic structure of 5N5 high-purity aluminum include the following steps:

[0032] (1) Clean the surface of the sample before electrolytic corrosion: rinse the polished sample with alcohol, the sample size is 15mm×19mm×6mm, and dry it with a hair dryer with cold air to ensure that the surface of the sample is free of dust and other pollutants;

[0033] (2) Preparation of electrolytic etchant: the composition of the etchant includes 20ml of hydrogen fluoride solution, 2.8g of boric acid, and 200ml of distilled water with a volume fraction of 40%. Pour distilled water, hydrogen fluoride solution, and boric acid into a clean container successively at room temperature, and stir until the boric acid Dissolve completely, and use after standing at a temperature lower than room temperature (20°C) for 20 minutes;

[0034] (3) Electrolytic corrosion: Turn on the DC power supply, adjust the voltage to 10V, c...

Embodiment 3

[0038] An electrolytic etchant and a corrosion method for displaying the metallographic structure of 6N high-purity aluminum include the following steps:

[0039] (1) Surface cleaning of the sample before electrolytic corrosion: Rinse the polished sample with alcohol, the size of the sample is 15mm×18mm×6mm, and dry it with a hair dryer with cold air to ensure that the surface of the sample is free of dust and other pollutants;

[0040] (2) Preparation of electrolytic etchant: the composition of the etchant includes 23ml of hydrogen fluoride solution, 2.6g of boric acid, and 200ml of distilled water with a volume fraction of 40%. Pour distilled water, hydrogen fluoride solution, and boric acid into a clean container successively at room temperature, and stir until the boric acid Dissolve completely, and use after standing at a temperature lower than room temperature (20°C) for 20 minutes;

[0041] (3) Electrolytic corrosion: Turn on the DC power supply, adjust the voltage to 1...

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Abstract

The invention discloses an electrolytic corrosive agent and corrosion method for displaying the metallographic structure of high-purity aluminum. The electrolytic corrosive agent is a mixture of the 40% hydrogen fluoride solution, boric acid and distilled water, wherein the ratio of the 40% hydrogen fluoride solution (ml) to the boric acid (g) to the distilled water (ml) is 18-23 to 2.5-3 to 200. The corrosion method comprises the following steps: (1) cleaning the surface of a sample before electrolytic corrosion; (2) preparing the electrolytic corrosive agent; (3) using the corrosive agent prepared in the step (2) for carrying out electrolytic corrosion according to specific electrolysis parameters; and (4) after electrolytic corrosion, cleaning the sample. According to the electrolytic corrosive agent and corrosion method, the corrosion effect is obvious, the operation is simple, the corrosion efficiency is high, the metallographic structure after corrosion can be clearly seen under a common optical microscope, a professional polarization device does not need to be additionally arranged, the experiment cost is reduced, and convenience is provided for better observing the structure texture of the high-purity aluminum.

Description

technical field [0001] The invention relates to the technical field of metallographic electrolytic corrosion, in particular to an electrolytic etchant and a corrosion method for displaying the metallographic structure of high-purity aluminum. Background technique [0002] High-purity aluminum has a series of excellent physical and chemical properties, low density, high thermal conductivity and electrical conductivity, high reflectivity to light, strong corrosion resistance to the atmosphere, good processing and forming performance, and no low-temperature brittleness , its strength and plasticity both increase with the decrease of temperature, and it has a wide range of applications in the electronics industry and aerospace fields. [0003] According to statistics, 96% of the 5N5-6N high-purity aluminum is used in the semiconductor device manufacturing industry, and the largest amount of sputtering metal targets is the high-purity aluminum target. Enterprises cannot stably pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04G01N1/32
CPCC25F3/04G01N1/32
Inventor 承龙范金席胡显军顾晔
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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