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Method for extracting steel superfine varia by electrolysis method

A technology of inclusion and electrolysis, applied in the field of electrochemical technology, can solve the problems of inclusion erosion, difficult non-destructive separation, etc., and achieve the effect of easy operation

Inactive Publication Date: 2007-11-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main difficulties are as follows: (1) During the extraction process, the inclusions are easily eroded by various media interfaces, and it is difficult to achieve non-destructive separation; (2) Due to the extremely small size of ultra-fine inclusions, it is necessary to select a suitable carrier with good comprehensive performance to retain ultrafine inclusions

Method used

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  • Method for extracting steel superfine varia by electrolysis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: first configure organic electrolyte, the formula of electrolyte is as follows: (wt%)

[0017] 2% of tetramethylammonium chloride, 8% of acetylacetone, 5% of glycerol, 6% of triethanolammonium, and methanol with a purity of 99.9% is the remainder; in addition, 5 g / L of diphenylguanidine is added by volume and weight.

[0018] Put the above electrolytic solution into the electrolytic cell; then put the steel sample containing oxide inclusions into the electrolytic cell after polishing and cleaning, as the anode, and place it at the anode position in the middle of the electrolytic cell; The control is 0.2 liters / min; the temperature of the electrolyte is controlled by an ice bath to 0~5°C; the electrolytic potential is adjusted to 2.4V, and the DC current density is 0.04A / cm 2 , electrolysis for 24 hours.

[0019] Then the above-mentioned electrolyte is further cleaned and filtered with absolute ethanol, and then put into a vacuum separation and filtration...

Embodiment 2

[0020] Embodiment 2: The organic electrolyte solution used in this embodiment is exactly the same as that of the above-mentioned embodiment 1.

[0021] In this embodiment, the steel sample containing nitride inclusions is polished and cleaned and placed in the electrolytic cell as an anode, placed in the anode position in the middle of the electrolytic cell; the inert gas argon is introduced, and its flow rate is controlled at 0.3 liters / minute ; The temperature of the electrolyte is controlled by an ice bath to 0~5°C; the electrolytic potential is adjusted to 3.2V, and the DC current density is 0.05A / cm 2 , electrolysis for 20 hours.

[0022] Then the above-mentioned electrolyte is further cleaned and filtered with absolute ethanol, and then put into a vacuum separation and filtration device with a polycarbonate membrane with a pore size of 80 nm as the filter carrier, and the ultrafine nitride inclusions are separated under vacuum operation. . Electron microscope inspectio...

Embodiment 3

[0024] The organic electrolytic solution adopted in this embodiment is exactly the same as that of the above-mentioned embodiment 1.

[0025] In this embodiment, the steel sample containing composite inclusions is polished and cleaned and placed in the electrolytic cell as an anode, placed in the anode position in the middle of the electrolytic cell; the inert gas argon is introduced, and its flow rate is controlled at 0.5 liters / min ; The temperature of the electrolyte is controlled by an ice bath to 0~5°C; the electrolytic potential is adjusted to 1.8V, and the DC current density is 0.025A / cm 2 , electrolysis for 40 hours.

[0026] Then the above-mentioned electrolyte is further cleaned and filtered with absolute ethanol and then put into a vacuum separation and filtration device with a polycarbonate membrane with a pore size of 80 nm as the filter carrier. seperate. Electron microscope inspection revealed that it was a spherical Ti-Al-O-Mn-S composite inclusion with a com...

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Abstract

A method of applying electrolytic process to extract out superfine impurities in steel includes preparing organic electrolyte by 2wt% of tetramethylsalmiac, 8wt% of diacetone, 5wt% of glycerin, 6wt% of trolamine, allowance of pure methanol and 5g / L of DPG as per valum / weight; polishing and washing steel sample then placing steel sample in electrolytic tank; using steel sample as anode; leading inter-gas of argon in and regulating electrolytic potential, holding steel sample in said tank for 20-40hours then using vacuum filtering device to separate out superfine impurities in steel sample under vacuum condition.

Description

technical field [0001] The invention relates to a method for extracting ultrafine inclusions in steel by electrolysis, which belongs to the technical field of electrochemical technology. Background technique [0002] Ultrafine inclusions in steel are of great significance to improve the properties of the steel matrix. In order to better study its formation mechanism and its effect on the matrix, it is necessary to extract them from the steel intact. Various extraction methods in the traditional sense are only limited to studying inclusions from a two-dimensional perspective, or studying large inclusions in steel from a three-dimensional perspective, but these methods are powerless for the complete extraction of ultrafine inclusions with a size less than 3 μm. The main difficulties are as follows: (1) During the extraction process, the inclusions are easily eroded by various media interfaces, and it is difficult to achieve non-destructive separation; (2) Due to the extremely ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N33/20
Inventor 王利伟郑少波陆青林倪晓明
Owner SHANGHAI UNIV
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