A uniform dense tib 2 Layered titanium-based cathode material and preparation method thereof

A cathode material, tib2-tib technology, is applied in the direction of coating, electrolytic coating, surface reaction electrolytic coating, etc., which can solve the problems that the service life is difficult to meet the requirements, the titanium substrate is easy to be corroded, and boronizing cannot be realized, etc., to achieve Eliminate the problem of plating peeling off, avoid corrosion, and increase the thickness

Active Publication Date: 2020-10-09
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, TiB for aluminum electrolysis cathode obtained directly by boronizing titanium substrate 2 - TiB on top layer of TiB / Ti gradient composite 2 The layer is uneven, not dense, and even partially fails to achieve the purpose of boronizing, so that the titanium substrate is partially exposed, and the titanium substrate exposed as the cathode of aluminum electrolysis is easily corroded, making its service life difficult to meet the requirements

Method used

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  • A uniform dense tib <sub>2</sub> Layered titanium-based cathode material and preparation method thereof
  • A uniform dense tib <sub>2</sub> Layered titanium-based cathode material and preparation method thereof
  • A uniform dense tib <sub>2</sub> Layered titanium-based cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Perform boronizing treatment on the titanium matrix with clean surface. The electrolyte composition and mass fraction are 70% anhydrous borax, 15% anhydrous potassium carbonate and 15% B 4 C. Take graphite crucible as anode, metal titanium plate as cathode, and control the cathode current density to 100mA / cm 2 , The temperature of the molten salt electrolyte is 850℃, and the power is applied for 5 hours to obtain TiB 2 -TiB / Ti gradient composite material;

[0025] (2) The TiB obtained in step (1) 2 -TiB / Ti gradient composite material for non-destructive cleaning, and TiB 2 -TiB / Ti gradient composite material is boiled in 0.5mol / L sodium hydroxide solution for 75min, then immersed in clean water at room temperature for 100min, then treated in 0.5 / L hydrochloric acid at room temperature for 6min, and finally cleaned by ultrasonic in clean water.

[0026] (3) The TiB that has been cleaned in step (2) 2 -TiB / Ti gradient composite material for molten salt electrodeposition TiB ...

Embodiment 2

[0028] (1) Perform boronizing treatment on the titanium matrix whose surface has been cleaned. The electrolyte composition and mass fraction are 75% anhydrous borax, 15% anhydrous potassium carbonate and 10% B 4 C. Take graphite crucible as anode, metal titanium plate as cathode, and control the cathode current density to 150mA / cm 2 , The temperature of the molten salt electrolyte is 800℃, and the power is applied for 4 hours to obtain TiB 2 -TiB / Ti gradient composite material.

[0029] (2) The TiB obtained in step (1) 2 -TiB / Ti gradient composite material for non-destructive cleaning, and TiB 2 -TiB / Ti gradient composite material is boiled in 1mol / L sodium hydroxide solution for 60min, then immersed in clean water at room temperature for 120min, then treated in 1mol / L hydrochloric acid at room temperature for 5min, and finally cleaned by ultrasonic in clean water.

[0030] (3) The TiB that has been cleaned in step (2) 2 -TiB / Ti gradient composite material for molten salt electrodepo...

Embodiment 3

[0032] (1) Perform boronizing treatment on the titanium matrix whose surface has been cleaned. The electrolyte composition and mass fraction are 80% anhydrous borax, 10% anhydrous potassium carbonate and 10% B 4 C. Take graphite crucible as anode, metal titanium plate as cathode, and control the cathode current density to 200mA / cm 2 , The temperature of the molten salt electrolyte is 950℃, and the electricity is applied for 0.5 hours to obtain TiB 2 -TiB / Ti gradient composite material.

[0033] (2) The TiB obtained in step (1) 2 -TiB / Ti gradient composite material for non-destructive cleaning, and TiB 2 -TiB / Ti gradient composite material is boiled in 3mol / L sodium hydroxide solution for 50min, then immersed in clean water at room temperature for 140min, then treated in 2mol / L hydrochloric acid at room temperature for 4min, and finally cleaned by ultrasonic in clean water.

[0034] (3) The TiB that has been cleaned in step (2) 2 -TiB / Ti gradient composite material for molten salt ele...

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Abstract

The invention provides a titanium based cathode material with a uniform and dense TiB2 layer and a preparation method of titanium based cathode material, and belongs to the technical field of cathodematerial preparation. The preparation method comprises the following steps that (1) a titanium substrate with the surface being completely treated is subjected to boronizing treatment, a boronizing agent is prepared from anhydrous borax, anhydrous potassium carbonate and B4C, a graphite crucible serves as an anode, a metal titanium plate serves as a cathode, and thus a TiB2-TiB / Ti gradient composite material is obtained; (2) the surface of the TiB2-TiB / Ti gradient composite material is completely cleaned; and (3) the completely treated composite material is subjected to TiB2 molten salt electrode position, and the TiB2-TiB / Ti gradient composite material with the surface electrodeposited with a TiB2 cladding material is obtained. According to the preparation method, the cathode TiB2-TiB / Tigradient composite material for aluminum electrolysis with the uniform and dense TiB2 outermost layer can be obtained, the TiB2 layer is thickened at the same time, and the service life of the cathodematerial is prolonged.

Description

【Technical Field】 [0001] The present invention relates to the technical field of cathode material preparation, in particular to a method of performing boronizing and electrodeposition treatment on a titanium base to prepare uniform and dense TiB 2 TiB 2 -TiB / Ti aluminum electrolysis cathode gradient composite material method. 【Background technique】 [0002] Carbon has always been used as a cathode lining material in aluminum electrolysis, but it is not wetted by molten aluminum, and is easily corroded by molten electrolyte and molten aluminum and damaged. In order to replace the carbon cathode lining, people are constantly trying to find new materials. So far, TiB 2 It is the most ideal aluminum electrolytic cathode lining material, because TiB 2 Not only can it be well wetted by liquid aluminum, but also can resist the erosion of liquid aluminum and molten electrolyte. At the same time, the pole distance can be significantly shortened, and the cell voltage and energy consumption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08C25D11/00
CPCC25C3/08C25D11/00
Inventor 黄有国陈家荣李庆余王少伊储有奇李玉范小萍傅浩王红强
Owner GUANGXI NORMAL UNIV
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