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Electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing organic solution

A technology of non-metallic inclusions and organic solutions, which is applied in the field of metal electrochemistry, can solve the problems of inaccurate chemical composition, easy destruction of inclusions, long electrolysis time, etc., and achieve convenient and effective preparation, short test cycle and improved efficiency Effect

Active Publication Date: 2011-10-12
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the morphology of inclusions is easily destroyed during the electrolysis and elutriation process, and the chemical composition is easily affected by the anodic reaction in the electrolysis process, which is inaccurate, and there are disadvantages such as long electrolysis time and difficult operation.
[0006] There are many traditional methods for detecting non-metallic inclusions, but they are powerless to completely extract non-metallic inclusions in steel and directly observe their three-dimensional morphology

Method used

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  • Electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing organic solution
  • Electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing organic solution
  • Electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing organic solution

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Embodiment 1

[0033] First prepare the electrolyte, the formula of the electrolyte is as follows: (wt%) tetramethylammonium chloride 1%, acetylacetone 23%, analytically pure methanol as the balance. figure 1 It is a schematic diagram of the electrolytic extraction of inclusions in steel used in the present invention. The electrolytic surface of the steel sample containing oxide inclusions is immersed in the electrolyte, and a salt tank is arranged next to the electrolytic tank, and saturated Potassium chloride solution, a salt bridge is set up between the salt tank and the electrolytic tank, and a calomel electrode is inserted in the salt tank, the calomel electrode is connected to a DC regulated power supply, and the steel sample is connected to the positive pole of a DC regulated power supply as an anode. The platinum wire is used as the electrolysis cathode, and the inert gas argon is passed through, the flow rate is controlled at 0.2 liters / min, the control voltage is 4V, the temperature...

Embodiment 2

[0036] The electrolyte solution used in this embodiment is exactly the same as that of the above-mentioned embodiment 1.

[0037] figure 1 It is a schematic diagram of the electrolytic extraction of inclusions in steel used in the present invention, the electrolytic surface of the steel sample containing calcium silicate inclusions is immersed in the electrolyte, and a salt tank is arranged next to the electrolytic tank, and the salt tank is placed Saturated potassium chloride solution, set up a salt bridge between the salt tank and the electrolytic tank, insert a calomel electrode in the salt tank, connect the calomel electrode to a DC regulated power supply, and connect the steel sample to the positive pole of the DC regulated power supply as an anode , the platinum wire is used as the cathode, and the inert gas argon is passed through, the flow rate is controlled at 0.3 liters / min, the control voltage is 3.5V, the temperature of the electrolyte is 0~15°C; the cathode DC cur...

Embodiment 3

[0039] The electrolyte solution used in this embodiment is exactly the same as that of the above-mentioned embodiment 1. Immerse the electrolytic surface of the steel sample containing calcium aluminosilicate inclusions in the electrolyte, and arrange a salt tank next to the electrolytic tank, and place a saturated potassium chloride solution in the salt tank, and set up between the salt tank and the electrolytic tank The calomel electrode is inserted into the salt tank, and the calomel electrode is connected to a DC regulated power supply. The steel sample is connected to the positive pole of the DC regulated power supply as the anode, and the platinum wire is used as the cathode. The flow control is 0.3 liters / min, the control voltage is 4V, the temperature of the electrolyte is 0~15℃; the cathode DC current density is 0.022~0.042A / cm 2 , The electrolysis time is 5 hours, and the amount of electrolyte is 0.7915 grams.

[0040] Then pour the above electrolytic solution into ...

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Abstract

The invention relates to an electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing an organic solution. The method comprises the following process steps: (1) preparing electrolyte; (2) preparing and electrolyzing a steel sample: soaking the steel sample containing the inclusion into the electrolyte in an electrolytic cell; arranging a salt bath beside the electrolytic cell; erecting a salt bridge between the salt bath and the electrolytic cell; inserting a calomel electrode into the salt bath; inserting a calomel electrode in the salt bath; using the positive electrode of the steel sample, connected with a direct current stabilized power supply, as the anode, using a platinum wire as an electrolysis cathode, charging inert gas, particularly referring to argon; and (3) separating: pouring the electrolyte left after the electrolysis of the steel sample in the step (2) into a funnel which is filled with filter paper; arranging a vacuum filtration device which is loaded with a polytetrafluoroethylene membrane at the position tightly attached to the liquid down port of the funnel; separating the inclusion from the steel sample under the state that the vacuum filtration device is vacuumized; and transferring the polytetrafluoroethylene membrane which is distributed with the inclusion to a scanning electron microscope for detection. In the method provided by the invention, the inclusion can be extracted out of the steel without being damaged; and the three-dimensional shape of the inclusion is directly observed.

Description

technical field [0001] The invention relates to a method for electrolytic extraction of organic solution and detection of non-metallic inclusions in steel. It belongs to the technical field of metal electrochemistry. Background technique [0002] It is well known that the quality of steel depends to some extent on the quantity, shape and size distribution of inclusions in steel. Inclusion content is an important indicator for evaluating steel grades. Generally, large inclusions will reduce the strength of steel and reduce the mechanical properties and corrosion fatigue limit of steel, but when the size of inclusions is small to a certain size, the situation will change, and the trace elements such as TiO2, B, Nb contained on the surface It will play a role in refining grains and improving strength and toughness. Therefore, in order to comprehensively study the formation mechanism of inclusions and their effects on steel properties, it is necessary to extract the inclusion...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N33/20C25F3/06C25F7/00
Inventor 许昊罗喜清白云范海东郎永胜吴玉
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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