Aluminium alloy extruded section microstructure examination method and electrode used for preparation of metallographic samples

A technology for microstructure and extruded profiles, which is applied in the field of inspection methods for the microstructure of aluminum alloy extruded profiles and electrodes for preparing metallographic samples, which can solve the problems of accuracy and efficiency not meeting the requirements, acid-base solution erosion Long time, micrograin boundaries are not obvious, etc., to improve the overall dark, conducive to detection and judgment, shorten the effect of erosion time

Pending Publication Date: 2018-01-09
SHANDONG YUHANG SPECIAL ALLOY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing inspection methods for the microstructure of aluminum alloy extruded profiles take a long time for acid-base solution erosion, the micrograin boundaries are not obvious, and the overall aluminum matrix is ​​dark, which is not conducive to detection and judgment, and the accuracy and efficiency of the inspection are far from not meet the requirements

Method used

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  • Aluminium alloy extruded section microstructure examination method and electrode used for preparation of metallographic samples
  • Aluminium alloy extruded section microstructure examination method and electrode used for preparation of metallographic samples
  • Aluminium alloy extruded section microstructure examination method and electrode used for preparation of metallographic samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The electrode used to prepare the metallographic sample in the inspection method of the following example includes a power connection rod 1 connected to the power supply cathode and a spiral immersion end 2 immersed in the electrolyte, and the power connection rod 1 and the spiral immersion end 2 are integrally formed. , the helical immersion end 2 is a cylindrical helical spring structure.

[0040] The power connecting rod 1 is perpendicular to the cylindrical upper surface of the spiral immersion end 2 .

[0041] The outer diameter of the spiral immersion end 2 is 90mm, and the height is about 35mm. When in use, the spiral immersion end 2 is completely immersed in the electrolyte, and the diameter of the electrolytic cell is 100mm, and the height is 80mm.

[0042] The power connecting rod 1 and the spiral immersion end 2 are made of stainless steel, preferably 316L stainless steel. The diameter of the stainless steel rod used for preparing the electrode is 3-4 mm, wh...

Embodiment 2

[0044] A method for testing the metallographic microstructure of an aluminum alloy extruded profile, the steps of which are as follows:

[0045] (1) Test preparation

[0046] a) The oxidation electrolysis device adopts a special stainless steel cathode spiral electrolysis plate, an adjustable DC power supply, and a hair dryer;

[0047] b) Optical microscope with polarized light and Lambda filter and supporting analysis software;

[0048] c) Reagent: 30% nitric acid solution, 99.7% alcohol (C 2 h 5 OH), perchloric acid (HClO 4 );

[0049] (2) Preparation of metallographic samples

[0050] a) Mill the surface of the sample to be observed (series 6 aluminum alloy) with a roughness not greater than 1.6um.

[0051] b) Polish the surface of the sample with 1000 and 2000 mesh sandpaper respectively until the surface is smooth and there are no obvious machining traces.

[0052] c) Grind and polish the sample with a woolen cloth until the surface appears a mirror surface without...

Embodiment 3

[0066] The difference between this embodiment and Embodiment 2 is that the parameter setting of the DC power supply is determined, the voltage is set to 40V, and the current is 1.8A.

[0067] The difference between this embodiment and Example 2 is that the depressurization speed is set to 1.5V / s, which is suitable for aluminum alloys with a large content of the second phase, and other steps and parameters are the same as those in Embodiment 2.

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Abstract

The invention discloses an aluminium alloy extruded section microstructure examination method and an electrode used for preparation of metallographic samples. Voltage reduction electrolysis is adoptedin sample preparation process, wherein electrolytic corrosion voltage is controlled to be 35 to 42V, current is controlled to be 1.2 to 2.0A, lasting time is controlled to be 10 to 25s, and voltage reduction speed is controlled to be 1 to 1.5V/s. According to the preparation process, conventional aluminium alloy electrochemical polishing and corrosion are combined for electrochemical polishing corrosion of the samples, the examination process is simplified, and voltage reduction corrosion is adopted at the same time, so that defects such as aluminium alloy sample corrosion effect is poor, andcorrosion surfaces become black are avoided, and aluminium alloy crystal boundaries and compounds can be obtained via corrosion easily. The method is simple, and is safer and more friendly to the environment than the prior art; and practicability and operationality are high.

Description

technical field [0001] The invention relates to the technical field of inspection methods for aluminum alloy profiles, in particular to a microstructure inspection method for aluminum alloy extruded profiles and electrodes for preparing metallographic samples. Background technique [0002] With the rapid development of worldwide aluminum alloy processing technology, new technologies, new materials, new processes, and new products emerge in an endless stream, and the application of aluminum alloy extrusion profiles is becoming more and more extensive. One of the important characterizations, the importance of its detection is particularly prominent. However, the existing inspection methods for the microstructure of aluminum alloy extruded profiles take a long time for acid-base solution erosion, the micrograin boundaries are not obvious, and the overall aluminum matrix is ​​dark, which is not conducive to detection and judgment, and the accuracy and efficiency of the inspectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N1/28
Inventor 王明亮吴庆芳张楠楠张燕杰黄琪琪
Owner SHANDONG YUHANG SPECIAL ALLOY EQUIP
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