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Titanium based cathode material with uniform and dense TiB2 layer and preparation method of titanium based cathode material

A cathode material and dense technology, applied in the direction of coating, electrolytic coating, surface reaction electrolytic coating, etc., 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, so as to eliminate the coating The problem of falling off, avoiding corrosion, and the effect of increasing thickness

Active Publication Date: 2019-04-30
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 the 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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  • Titanium based cathode material with uniform and dense TiB2 layer and preparation method of titanium based cathode material
  • Titanium based cathode material with uniform and dense TiB2 layer and preparation method of titanium based cathode material
  • Titanium based cathode material with uniform and dense TiB2 layer and preparation method of titanium based cathode material

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Effect test

Embodiment 1

[0024] (1) Carry out boronizing treatment to the titanium base body that surface has been treated clean, electrolyte component and mass fraction are, the anhydrous borax of 70%, the anhydrous potassium carbonate of 15% and the B of 15% 4 C, with the graphite crucible as the anode and the metal titanium plate as the cathode, the cathode current density is controlled at 100mA / cm 2 , the temperature of the molten salt electrolyte is 850°C, and the electricity is energized for 5 hours, so as to obtain TiB 2 -TiB / Ti gradient composite material;

[0025] (2) TiB obtained in step (1) 2 -TiB / Ti gradient composite material is cleaned without damage, and the TiB 2 -TiB / Ti gradient composite material was boiled in 0.5mol / L sodium hydroxide solution for 75min, then soaked in clean water for 100min at room temperature, then treated in 0.5 / L hydrochloric acid for 6min at room temperature, and finally cleaned with ultrasonic waves in clean water.

[0026] (3) TiB after step (2) is cleaned...

Embodiment 2

[0028] (1) Carry out boronizing treatment to the titanium matrix that surface has been treated clean, electrolyte component and mass fraction are, the anhydrous borax of 75%, the anhydrous potassium carbonate of 15% and the B of 10% 4 C, with the graphite crucible as the anode and the metal titanium plate as the cathode, the cathode current density is controlled at 150mA / cm 2 , the temperature of the molten salt electrolyte is 800 °C, and the electricity is energized for 4 hours, so as to obtain TiB 2 - TiB / Ti gradient composites.

[0029] (2) TiB obtained in step (1) 2 -TiB / Ti gradient composite material is cleaned without damage, and the TiB 2 -TiB / Ti gradient composite material was boiled in 1mol / L sodium hydroxide solution for 60min, then soaked in clean water at room temperature for 120min, then treated in 1mol / L hydrochloric acid at room temperature for 5min, and finally cleaned with ultrasonic waves in clean water.

[0030] (3) TiB after step (2) is cleaned 2 -TiB / T...

Embodiment 3

[0032] (1) Carry out boronizing treatment to the titanium base body that surface has been treated clean, electrolyte component and mass fraction are, the anhydrous borax of 80%, the anhydrous potassium carbonate of 10% and the B of 10% 4 C, with the graphite crucible as the anode and the metal titanium plate as the cathode, the current density of the cathode is controlled at 200mA / cm 2 , the temperature of the molten salt electrolyte is 950°C, and energized for 0.5 hours, thus obtaining TiB 2 - TiB / Ti gradient composites.

[0033] (2) TiB obtained in step (1) 2 -TiB / Ti gradient composite material is cleaned without damage, and the TiB 2 -TiB / Ti gradient composite material was boiled in 3mol / L sodium hydroxide solution for 50min, then soaked in clean water at room temperature for 140min, then treated in 2mol / L hydrochloric acid at room temperature for 4min, and finally cleaned with ultrasonic waves in clean water.

[0034] (3) TiB after step (2) is cleaned 2 -TiB / Ti Gradien...

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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 invention relates to the technical field of preparation of cathode materials, in particular to a method of boronizing and electrodepositioning a titanium base to prepare uniform and dense TiB 2 Layer TiB 2 - Method of cathode gradient composite material for TiB / Ti aluminum electrolysis. 【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 eroded and damaged by molten electrolyte and molten aluminum. In order to replace the carbon cathode lining, people continue to strive to find new materials, so far, TiB 2 It is the most ideal aluminum electrolysis cathode lining material, because TiB 2 Not only can it be well wetted by molten aluminum, but it can also resist the erosion of molten aluminum and molten electrolyte. At the same time, the pole distance can be significantly shortened, and the cell voltage and energy consumption can b...

Claims

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Application Information

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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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