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5xxx series Al-Mg alloy grain boundary corrosive liquid and corrosion method

A technology of grain boundary corrosion and etching solution, applied in the field of metallographic corrosion of aluminum alloys, can solve the problems of difficulty in increasing grain boundaries of 5xxx series Al-Mg alloys, increase in time cost and economic cost, unfavorable grain morphology and alloy properties, etc. To achieve the effect of saving time cost and economic cost, clearly visible grain boundaries, and good effect

Active Publication Date: 2021-09-07
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But precisely because this alloy has better corrosion resistance than other non-rust-proof aluminum alloys, it is difficult to obtain its metallographic structure by conventional corrosion methods
In addition, the small difference between the alloy grain boundary and the interior of the grain further increases the difficulty of corroding the grain boundary of the 5xxx series Al-Mg alloy
Therefore, when studying the influence of the grain morphology and size of 5xxx series aluminum alloys on the properties of the alloy, due to the difficulty of corrosion, the sample preparation effect is poor, and the time cost and economic cost are increased, which is not conducive to the grain morphology and size. Research on the influence of alloy properties, etc.

Method used

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  • 5xxx series Al-Mg alloy grain boundary corrosive liquid and corrosion method
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  • 5xxx series Al-Mg alloy grain boundary corrosive liquid and corrosion method

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Experimental program
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Effect test

Embodiment 1

[0033] The grain boundary corrosion method of 5xxx series aluminum alloy comprises the following steps:

[0034] (1) Configure corrosion solution, its formula consists of the following components: 110mL , 15 mL , 0.5 mL HF, 0.5 HCl, 2 g ;in The concentrations of the three acids , HF and HCl are 68%, 40% and 38% respectively.

[0035] Quantitatively weighed , and then add water, HF, , HCl;

[0036] (2) Inlay aluminum alloy samples, hot-mount the 5xxx series aluminum alloy samples in a mounting machine using phenolic resin powder, and the mounting temperature and time are 130°C and 8 min, respectively;

[0037] (3) Grinding. After the inlaid sample is cooled, grind the inlaid sample with sandpaper from low mesh to high mesh; use 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh, and 1500 mesh in sequence , 2000 mesh, 3000 mesh, 5000 mesh, and 7000 mesh sandpaper are polished under running water;

[0038] (4) Polishing, polishing the polished sample; f...

Embodiment 2

[0045] 5xxx series aluminum alloy grain boundary corrosion method, is characterized in that, comprises the following steps:

[0046] (1) Prepare the corrosion solution, its formula consists of the following components: 95 mL , 18mL , 2 mL HF , 1.8 mL HCl , 3.5 g ;in The concentrations of the three acids , HF and HCl are 66.%, 40%, and 37% respectively. Quantitatively weighed , and then add water, HF, , HCl;

[0047] (2) Inlay aluminum alloy samples, hot-mount the 5xxx series aluminum alloy samples in a mounting machine using phenolic resin powder, and the mounting temperature and time are 130°C and 8 min, respectively;

[0048] (3) Grinding. After the inlaid sample is cooled, grind the inlaid sample with sandpaper from low mesh to high mesh; use 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh, and 1500 mesh in sequence , 2000 mesh, 3000 mesh, 5000 mesh, and 7000 mesh sandpaper are polished under running water;

[0049](4) Polishing, polishing the ...

Embodiment 3

[0056] 5xxx series aluminum alloy grain boundary corrosion method, is characterized in that, comprises the following steps:

[0057] (1) Prepare the corrosion solution, its formula consists of the following components: 80 mL , 20 mL , 3.5 mL HF, 3 mL HCl, 5 g ;in The concentrations of the three acids , HF and HCl are 65%, 40% and 36% respectively.

[0058] Quantitatively weighed , and then add water, HF, , HCl;

[0059] (2) Inlay aluminum alloy samples, hot-mount the 5xxx series aluminum alloy samples in a mounting machine using phenolic resin powder, and the mounting temperature and time are 130°C and 8 min, respectively;

[0060] (3) Grinding. After the inlaid sample is cooled, grind the inlaid sample with sandpaper from low mesh to high mesh; use 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh, and 1500 mesh in sequence , 2000 mesh, 3000 mesh, 5000 mesh, and 7000 mesh sandpaper are polished under running water;

[0061] (4) Polishing, polishing...

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Abstract

The invention relates to a corrosion method of a 5xxx series Al-Mg alloy grain boundary, which mainly comprises the following steps: 1, preparing a corrosion liquid which comprises the following components: 80-110 mL, 15-20 mL, 0.5-3.5 mL of HF, 0.5-3 mL of HCl and 2-5 g of HCl; 2, embedding an aluminum alloy sample; 3, polishing the embedded samples sequentially with abrasive paper from low meshes to high meshes; 4, polishing the ground sample; 5, cleaning the polished sample with absolute ethyl alcohol; 6, corroding the sample for 60-90 seconds by using the prepared corrosive liquid; and 7, after corrosion patterns appear on the surface of the sample, cleaning the sample with absolute ethyl alcohol and carrying out drying treatment. After the method is used for corroding the 5xxx series Al-Mg alloy, the grain boundary of the alloy can be clearly observed, and the method is low in equipment requirement, simple in operation step, capable of saving cost, good in stability and suitable for researching the grain morphology, the grain size, the microstructure performance and the like of the Al-Mg alloy.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion of aluminum alloys, in particular to an etching solution and an etching method for grain boundaries of 5xxx series Al-Mg alloys. Background technique [0002] When studying the influence of grain morphology and size of aluminum alloy materials on the properties of alloys, it is often necessary to observe the grain boundaries of samples. The commonly used method is electropolishing plus polarizing treatment. During operation, the sample is prepared first, and then the microscope observation is carried out through the polarizing treatment. The sample preparation process is complicated and cumbersome and has high requirements for the microscope, which increases the time cost and cost of research. economic cost. For sample preparation, the two main steps that affect its effect are polishing and corrosion. [0003] The 5xxx series aluminum alloys are mainly composed of Al and Mg, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 李萌蘖左汉宁杨映益杨红斌陈轩
Owner KUNMING UNIV OF SCI & TECH
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