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A method of electrodepositing tungsten alloy

A tungsten alloy and electrodeposition technology, applied in the field of material surface treatment, can solve the problems of high toxicity, pollute the environment, low current efficiency, etc., and achieve the effect of compact and smooth surface, strong coating hardness and stable electrolyte.

Active Publication Date: 2018-03-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the electroplating process, the current efficiency is very low (8% to 6%), the toxicity is high, and the environment is seriously polluted.

Method used

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  • A method of electrodepositing tungsten alloy
  • A method of electrodepositing tungsten alloy

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Experimental program
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Effect test

Embodiment 1

[0016] (1) Configure the electrolyte: in a clean beaker, first add boric acid to dissolve completely; then add sodium tungstate, cobalt sulfate, and nickel sulfate, stir and dissolve to form a salt solution with a molar concentration ratio of tungsten, cobalt, and nickel ions of 3:1:1 ; Then add complex complexing agent citric acid and succinic acid, the molar concentration ratio is 3:1; finally add sodium lauryl sulfate solution, fully stir. The composition of the electrolyte is: sodium tungstate 30g / L, cobalt sulfate 8g / L, nickel sulfate 8g / L, citric acid 58g / L, succinic acid 12g / L, boric acid 4g / L, sodium lauryl sulfate 0.1 g / L. The cathode is a stainless steel plate (30mm×20mm), the anode is a graphite sheet (70mm×25mm), the two electrodes are placed in parallel and the distance between the two electrodes is 20mm. The electrodeposition temperature is 40°C, controlled by a constant temperature water bath, the electrodeposition time is 1h, and the current density is 500mA / d...

Embodiment 2

[0018] (2) Configure the electrolyte: in a clean beaker, first add boric acid to dissolve completely; then add sodium tungstate, cobalt sulfate, and nickel sulfate, stir and dissolve to form a salt solution with a molar concentration ratio of tungsten, cobalt, and nickel ions of 3:1:1 ; Then add complex complexing agent citric acid and succinic acid, the molar concentration ratio is 3:1; finally add sodium lauryl sulfate solution, fully stir. The composition of the electrolyte is: sodium tungstate 99g / L, cobalt sulfate 28g / L, nickel sulfate 26g / L, citric acid 116g / L, succinic acid 24g / L, boric acid 5g / L, sodium lauryl sulfate 0.1 g / L. The cathode is a stainless steel plate (30mm×20mm), the anode is a graphite sheet (70mm×25mm), the two electrodes are placed in parallel and the distance between the two electrodes is 20mm. The electrodeposition temperature is 80°C, controlled by a constant temperature water bath, the electrodeposition time is 5h, and the current density is 750m...

Embodiment 3

[0020] (3) Prepare the electrolyte: in a clean beaker, first add boric acid to dissolve completely; then add sodium tungstate, cobalt sulfate, and nickel sulfate, stir and dissolve to form a salt solution with a molar concentration ratio of tungsten, cobalt, and nickel ions of 3:1:1 ; Then add complex complexing agent citric acid and succinic acid, the molar concentration ratio is 3:1; finally add sodium lauryl sulfate solution, fully stir. The composition of the electrolyte is: sodium tungstate 50 / L, cobalt sulfate 14g / L, nickel sulfate 13g / L, citric acid 87g / L, succinic acid 18g / L, boric acid 6g / L, sodium lauryl sulfate 0.1 g / L. The cathode is a stainless steel plate (30mm×20mm), the anode is a graphite sheet (70mm×25mm), the two electrodes are placed in parallel and the distance between the two electrodes is 20mm. The electrodeposition temperature is 60°C, controlled by a constant temperature water bath, the electrodeposition time is 3h, and the current density is 600mA / dm...

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Abstract

The invention discloses a tungsten alloy electro-deposition method. According to the method, a boric acid solution is prepared, then sodium tungstate, cobalt sulfate and nickel sulfate are added to be stirred and dissolved, and a salt solution with the molecular concentration ratio of tungsten ions to cobalt ions to nickel ions being 3:1:1 is formed; then a compound complexing agent of citric acid and succinic acid is added, and the molecular concentration ratio of citric acid to succinic acid is 3:1; finally, a sodium dodecyl sulfate solution is added and fully stirred; and the final using amount of citric acid in an electrolyte is 58-116 g / L, the final using amount of a wetting agent of sodium dodecyl sulfate is 0.1 g / L, the final using amount of sodium tungstate is 30-99 g / L, and the final using amount of boric acid is 4-6 g / L. Tungsten alloy is electrically deposited in a constant-current manner, a negative electrode is formed by a stainless steel plate, and a positive electrode is formed by a dual-graphite plate; the negative electrode and the positive electrode are placed in an electrolysis tank in parallel, electrolysis time is 1-5 h, electrolysis temperature is 40-80 DEG C, the current intensity is 500-750 mA / dm<2>, and pH is 5-7. The electrolyte is stable, an amorphous tungsten alloy coating can be obtained, the surface is compact and flat, and the hardness of the coating is high.

Description

technical field [0001] The invention relates to a method for electrodepositing tungsten alloys, which uses electrodeposition to deposit tungsten ions together with cobalt and nickel ions in aqueous solution to achieve the purpose of forming amorphous tungsten alloys, and clarifies the characteristics and application of the process The method belongs to the field of material surface treatment. Background technique [0002] Tungsten has a very high melting point and is a refractory metal. There are not many preparation methods for refractory metals. The main methods are ingot processing method, plastic processing method, directional solidification technology, molten salt electrolysis preparation method and powder metallurgy technology. Wait. If more excellent properties are required for the prepared metal, higher requirements will be placed on the initial particle size and shape of the powder. The current ultrafine powder preparation methods mainly include mechanical methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
CPCC25D3/56
Inventor 席晓丽董婷婷马立文聂祚仁王娜
Owner BEIJING UNIV OF TECH
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