A kind of metallographic etchant and using method thereof

A technology of etchant and solvent, applied in the field of metallographic etchant, can solve the problems of difficult operation, high requirements on detection conditions, cumbersome test process, etc., and achieve the effect of good corrosion effect, fast corrosion speed and simple operation.

Active Publication Date: 2020-03-20
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The display of the grain boundary by the anode coating is clear enough and the display effect is good, but the anode coating also has problems such as cumbersome test process, high requirements for detection conditions, and difficult operation, which affect the popularization of this detection method
EBSD also has a good display effect on grain boundaries, but its detection equipment is expensive and the test process is more cumbersome. It is mainly used in the field of material science research

Method used

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  • A kind of metallographic etchant and using method thereof
  • A kind of metallographic etchant and using method thereof
  • A kind of metallographic etchant and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Use solution A to rub the polished 6005A-T6 aluminum alloy sample for 15s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0046] (2) Subsequently, the 6005A-T6 aluminum alloy sample was etched with solution B for 20 s. After the corrosion was completed, it was washed with distilled water and absolute ethanol and dried.

[0047] (3) Use solution A to etch the 6005A-T6 aluminum alloy sample for 20s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0048] (4) Use a metallographic microscope to observe the microstructure of 6005A-T6 aluminum alloy, such as figure 1 As shown, it can be seen that the grain boundaries are clear, the grains are fine and uniform, and the coloring effect is good; figure 2 As shown in Fig. 1, it can be seen that the welding crack at the fusion line of the joint is clearly distinguished from the grain boundary remelted by heating.

Embodiment 2

[0050] (1) Use solution A to etch the polished 6N01S-T5 aluminum alloy sample for 45s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0051] (2) Subsequently, the 6N01S-T5 aluminum alloy sample was etched with solution B for 50 s. After the corrosion was completed, it was washed with distilled water and absolute ethanol and dried.

[0052] (3) Use solution A to etch the 6N01S-T5 aluminum alloy sample for 45s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0053] (4) Use a metallographic microscope to observe the microstructure of 6N01S-T5 aluminum alloy, such as Figure 4 As shown, it can be seen that the grain boundaries are clear, the grains are coarse, and the coloring effect is good.

Embodiment 3

[0055] (1) Use solution A to etch the polished 6061P-T6 aluminum alloy sample for 20s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0056] (2) Subsequently, the 6061P-T6 aluminum alloy sample was etched with solution B for 10 s. After the corrosion was completed, it was washed with distilled water and absolute ethanol and dried.

[0057] (3) Use solution A to etch the 6061P-T6 aluminum alloy sample for 35s. After the corrosion is completed, wash and dry it with distilled water and absolute ethanol.

[0058] (4) Use a metallographic microscope to observe the microstructure of 6061P-T6 aluminum alloy, such as Figure 6 As shown, the visible grain boundaries are clearly displayed, and the second phase does not affect the observation of grain boundaries.

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Abstract

The invention relates to a metallic-phase corrosive and further relates to a using method of the metallic-phase corrosive. The metallic-phase corrosive is used for corroding a six-series aluminum alloy and comprises a component A which comprises HF with the content being 5-20%. The using method comprises the following steps (1) the metallic-phase corrosive is adopted to corrode the polished alloy,after corrosion reaches to a certain extent, cleaning and blow-drying are conducted; and (2) microstructures are observed. The metallic-phase corrosive and the using method thereof have the advantages of being high in corrosion speed, good in corrosion effect, easy to operate and the like, and the metallic-phase corrosive has a certain dyeing function, so that the grain boundary and phase boundary of an aluminum alloy material are both clearly displayed. Chemical reagents for preparing the metallic-phase corrosive are all commonly-used reagents and are easy to obtain in the market. During corroding, the metallic-phase corrosive does not need to be heated, the obtained metallic-phase structures can be detected under the normal temperature condition, the requirements for the detection conditions and detection equipment are few, and operation is easy.

Description

technical field [0001] The invention relates to a metallographic etchant, and also relates to a method for using the metallographic etchant. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, corrosion resistance, and good extrusion forming performance. It meets the requirements of lightweight design and is the main material for high-speed train bodies. Microstructure testing is an important testing method for aluminum alloys and their welded joints, in which the size of the grain size has an important impact on the quality of the structure and performance, and is the focus of metal material testing. [0003] Usually, the etchant used to observe the microstructure of aluminum alloy has a good imaging ability for the precipitated phase and rolled strip of the deformed aluminum alloy, but its display of the grain boundary is not clear enough, so anodic coating and EBSD are generally used. (Electron backscatter diffraction) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/20G01N1/32
CPCC23F1/20G01N1/32
Inventor 崔云龙孙雪汪认张仁航池浩瀚阚晓阳
Owner CRRC QINGDAO SIFANG CO LTD
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