Method for extracting S30432 steel carbonitride with electrolytic method

A technology of carbonitride and electrolysis, applied in the field of electrochemical technology, can solve the problems of lack of statistical representativeness, cumbersome and time-consuming methods, etc., and achieve the effects of facilitating activation and dissolution, high extraction rate, and easy washing

Inactive Publication Date: 2011-04-27
SHANGHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

When using electron microscopes, probes and other equipment to study the types of carbonitrides, since what is observ

Method used

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  • Method for extracting S30432 steel carbonitride with electrolytic method
  • Method for extracting S30432 steel carbonitride with electrolytic method
  • Method for extracting S30432 steel carbonitride with electrolytic method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: First prepare the electrolyte solution, the electrolyte solution formula is as follows (wt%): tetramethylammonium chloride 1%, acetylacetone 10%, methanol (analytical pure) 89%.

[0022] Put the above electrolyte into the electrolytic cell, polish and clean the supplied S30432 steel sample (5×10×80mm) and put it into the electrolytic cell as the anode, and the sheet-shaped platinum electrode as the cathode, and control the current density to 25mA / cm 2 , constant current electrolysis for 8h; keep the temperature at 0°C.

[0023] Then put the above electrolytic solution into a vacuum separation and filtration device equipped with a polycarbonate filter membrane with a pore size of 50nm, and separate the precipitates under a vacuum state, and dry them for more than 24 hours. Weigh, and calculate the carbonitride mass fraction to be 0.73%. XRD pattern analysis shows that NbC and NbN are found.

Embodiment 2

[0024] Embodiment 2: This embodiment is basically the same as Embodiment 1. The difference is: the S30432 heat-resistant steel sample (5×10×80mm) aged at 650°C for 3000h is polished and cleaned and placed in the electrolytic cell as the anode, and the sheet-shaped platinum electrode as the cathode, and the current density is controlled at 25mA / cm 2 , constant current electrolysis for 8h; keep the temperature at 0°C.

[0025] Then put the above electrolytic solution into a vacuum separation and filtration device equipped with a polycarbonate filter membrane with a pore size of 50 nm, and separate the carbonitrides in a vacuum state, and dry for more than 24 hours. Weigh and calculate the carbonitride mass fraction to be 1.5%. XRD pattern analysis shows that carbonitrides include NbC, NbN and M 23 C 6 . This is because the sample treatment conditions used in this example are different from Example 1, the mass fraction of carbonitrides increases, corresponding to a new carbon...

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Abstract

The invention relates to a method for extracting heat-resistant S30432 steel carbonitride with an electrolytic method, belonging to the technical field of electrochemistry processes. The method comprises the following steps of: (1) preparing organic electrolyte, which comprises 0.8-2wt% of tetramethylammonium chloride, 8-12wt% of acetylacetone and 86-91wt% of methanol (analytically pure) in a formula; (2) accurately grinding and polishing the surface of a lamellar reagent (5*10*80mm) and then ultrasonically washing; (3) with a specimen as an anode and a platinum electrode as a cathode, controlling the current density to be 20-30mA/cm<2>, and carrying out constant-current electrolysis for 6-14h, and keeping the temperature as low as -5-5 DEG C; and (4) pasting a selected polycarbonate filter membrane paster with apertures in 10-100nm on a pinhole collector, and separating carbonitride by a vacuum separation filter to obtain NbC, NbN and M23C6.

Description

technical field [0001] The invention relates to a method for extracting carbonitrides of S30432 heat-resistant steel by electrolysis, which belongs to the technical field of electrochemical technology. Background technique [0002] The type, quantity, size, and distribution of carbonitrides in steel are important factors affecting the properties of steel materials. The change of carbonitrides directly affects the changes in the properties of steel materials. When using electron microscopes, probes and other equipment to study the types of carbonitrides, because only local areas are observed, it is not statistically representative, and the method is very cumbersome and time-consuming. And if the carbonitride can be extracted from the sample for X-ray diffraction analysis, the obtained data can represent the overall situation of the sample. Since the carbonitride phase is very small in the sample, a large amount of matrix must be removed before it can be detected, so the carb...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N23/20
Inventor 朱丽慧张玉洁刘坤涂从红杨函
Owner SHANGHAI UNIV
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