Metallographic corrosive and alloy macrostructure display method

A display method and etchant technology, which is applied in the field of metallographic etchant and alloy macrostructure display, and can solve the problems such as unsatisfactory corrosion effect of 3 series aluminum alloys

Active Publication Date: 2017-05-10
珠海格力绿色再生资源有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a metallographic etchant and a method for displaying the macrostructure of the ...

Method used

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  • Metallographic corrosive and alloy macrostructure display method
  • Metallographic corrosive and alloy macrostructure display method
  • Metallographic corrosive and alloy macrostructure display method

Examples

Experimental program
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Embodiment 1

[0038] At room temperature, pour sodium hydroxide and potassium thiocyanate into a beaker filled with distilled water. The dosage of each substance is shown in Table 1. Stir with a glass rod until the solute is completely dissolved, and let it stand for 2 minutes to form a metallographic etchant. .

[0039]The SAPA 3-series long-life aluminum alloy tube samples used for air-conditioning heat exchangers were intercepted for grinding and polishing. The grinding and polishing treatment specifically includes: sequentially using 100 mesh, 400 mesh, and 800 mesh water sandpaper to polish the surface to be corroded step by step, adding water to wet the sample during the polishing process, and grinding time for each level of sandpaper for 3 to 5 minutes, so as to obtain a flat and smooth surface. Smoother finish. When grinding, the sandpaper is placed on the pre-grinder, and the pre-grinder drives the sandpaper to rotate at a speed of 500-1000r / min. The pre-grinder continuously wets...

Embodiment 2 to 6、 comparative example 1 to 3

[0043] The composition of metallographic etchant is shown in Table 1, and others are identical with embodiment 1, and wherein, the observation result of embodiment 2 sees figure 2 , the observation result of embodiment 3 sees image 3 , see the observation results of Comparative Example 1 Figure 4 , see the observation results of Comparative Example 2 Figure 5 , see the observation result of comparative example 3 Image 6 , the magnification is 400 times, and the observation results of embodiment 3, embodiment 4 and embodiment 5 are basically the same, the observation results of embodiment 6 and embodiment 2 are basically the same, the observation results of embodiment 7 are between comparative example 3 Compared with Example 3, but the macrostructure of the 3-series aluminum alloy cannot be well judged.

Embodiment 7

[0045] The composition of the metallographic etchant is the same as in Example 1, except that the sample is taken out after 20s.

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Abstract

The invention provides a metallographic corrosive and an alloy macrostructure display method. The metallographic corrosive comprises water soluble alkali metal hydroxide, water soluble thiocyanate and water. In the metallographic corrosive, the mole concentration of hydroxide ions is 5 mol/L, and the mole concentration of thiocyanate ions is 0.001-0.011 mol/L. The corrosion rate of grain boundaries and the corrosion rate of crystal grains are matched by adding the thiocyanate to accelerate grain boundary corrosion by means of activity difference between the grain boundaries and the crystal grains, and at this time, the thiocyanate serves as an activator; and meanwhile, the mole concentration of the thiocyanate ions and the mole concentration of the hydroxide ions are matched, so that corrosion to the hydroxyl ions is controlled at a proper degree, insufficient corrosion is avoided, and the phenomenon of excessive corrosion that the aluminum alloy grain boundaries and crystal grains are corroded at the same time is avoided.

Description

technical field [0001] The invention relates to the field of metal detection, in particular to a method for displaying the macroscopic structure of a metallographic etchant and an alloy. Background technique [0002] In order to detect the macroscopic structure of the metal, it is necessary to immerse the metal in a metallographic etchant. The composition ratio of the existing common etchant is hydrochloric acid: nitric acid: hydrofluoric acid: water = 3:5:2:190, but using this metallographic When corrosive agents corrode aluminum alloys, their practical application effects are not ideal. In view of the shortcomings of general metallographic etchant, some researchers have proposed an improvement plan. The composition of the etchant is hydrochloric acid, nitric acid, hydrofluoric acid and distilled water with a volume ratio of 9:3:3:20, which can clear the structure of aluminum and aluminum-copper alloys. Appeared (referring to the Chinese patent application that application...

Claims

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Application Information

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IPC IPC(8): C23F1/36G01N1/32
CPCC23F1/36G01N1/32
Inventor 熊佳龙彭楚堂陈学王红霞王琳马颖江朱宏亮李超男
Owner 珠海格力绿色再生资源有限公司
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