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A method for synthesizing high preferred orientation aluminum coating by supergravity technology

A super-gravity, aluminum coating technology, applied in the field of metal electrodeposition, can solve the problems of unevenly distributed deposition layer, high viscosity of ionic liquid, low electrochemical window, etc., to improve the electrodeposition rate, corrosion resistance and mechanical properties. , the effect of promoting ion mass transfer

Inactive Publication Date: 2017-02-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature molten salt system is currently the method of electrolytic aluminum widely used in the industry, but this method has many disadvantages, such as: the electrolysis temperature is too high (about 1000 ° C), the equipment is corrosive, and the energy consumption is large (per 1Kg of electrolysis Aluminum will consume 15 kWh of electricity), pollute the environment, etc.; when the organic solvent system is used for electrolytic aluminum, although the temperature during electrolysis is not as high as that of the high-temperature molten salt system, this system also has many disadvantages: the solvent is easy to Volatile, flammable, explosive, low electrochemical window, etc.; as a new type of solvent system, organic molten salt system (room temperature ionic liquid) has many advantages: low vapor pressure, almost no volatility, high electrochemical window, High stability, wide operating temperature range (-90°C ~ 400°C), etc., the most important thing is that when ionic liquid is used for electrolytic aluminum, aluminum can be electrodeposited at room temperature or at a low temperature below (100°C). , compared with the high temperature molten salt system, the energy consumption in the process is greatly reduced
[0004] At present, there are many studies on the electrodeposition of aluminum in ionic liquids. Many researchers can obtain deposits with good adhesion and good gloss from ionic liquids. However, the viscosity of ionic liquids is usually high, so the electrodeposition process used The current density is usually low, and in the absence of any additives, only unevenly distributed deposits can be obtained

Method used

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  • A method for synthesizing high preferred orientation aluminum coating by supergravity technology
  • A method for synthesizing high preferred orientation aluminum coating by supergravity technology
  • A method for synthesizing high preferred orientation aluminum coating by supergravity technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the three-necked flask under the protection of nitrogen, configure AlCl 3 -BMIC (1-butyl-3-methylimidazolium chlorate), finely ground anhydrous AlCl 3 The powder is slowly added to the flask in small amounts several times, so that the AlCl 3 The molar ratio with BMIC is 2:1, stir for about 2 hours after adding. The ionic liquid is used as the electrolyte, toluene is added as the co-solvent, the stainless steel sheet is used as the cathode, and the soluble aluminum-based composite material is used as the anode. The two electrodes are placed parallel to the direction of centrifugal force, the electrode spacing is fixed, and a certain hypergravity coefficient is set for electrodeposition experiments. In the electrolysis process, a certain electrodeposition temperature, current density, reaction time and different additive concentrations can be set, and the influence of these factors on the coating can be investigated to find the range of electrodeposition conditions th...

Embodiment 2

[0033] Utilize method described in the present invention, when adding volume fraction greater than the AlCl of 40% toluene 3 -BMIC (molar ratio 2:1) in the ionic liquid experiment of constant current electrodeposition of aluminum. The ionic liquid was synthesized by the experimental method in Example 1. In the experiment, the working electrode was made of stainless steel sheet, and the counter electrode was made of aluminum-based composite material. The treatment method of the electrode sheet and the deposit obtained after the electrodeposition were all used in the method in Example 1. Electrode sheets were weighed with an electronic balance before and after deposition.

[0034] When the supergravity coefficient is 100 (the speed is 736r / min), the current density is 30mA / cm 2 , electrodeposition time is 1h, AlCl 3 The galvanostatic electrodeposition experiment was carried out in an electrolyte with a molar ratio of 2:1 to BMIC and a volume fraction of toluene of 60%. The e...

Embodiment 3

[0038] Using the method described in the present invention, the method used in Example 1 was used to conduct electrodeposition experiments. When the supergravity coefficient is 100 (the speed is 736r / min), the temperature is 70°C, and the electrodeposition time is 1h, AlCl 3 The galvanostatic electrodeposition experiment was carried out in an electrolyte with a molar ratio of 2:1 to BMIC and a volume fraction of toluene greater than 40%. The experimental conditions and experimental conclusions are as follows:

[0039]

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Abstract

The invention discloses a method for synchronizing a high preferred orientation aluminum coating by using a supergravity technology, belonging to the field of unconventional metal electro-deposition. With an aluminum sheet or aluminum-based composite material as a positive pole, a stainless steel sheet as a negative pole, chloroaluminate ionic liquid using methylbenzene as a cosolvent as an electrolyte, and an inert gas as a protective gas, a supergravity field is generated through centrifugal rotation of an electrolytic cell, and thus aluminum electro-deposition is realized in the supergravity field, and the compact and bright high preferred orientation aluminum coating is finally obtained. Compared with a coating which is synthesized without addition of methylbenzene, the high preferred orientation aluminum coating has a more compact structure, and remarkably improved corrosion resistance, mechanism property and the like.

Description

technical field [0001] The invention belongs to the field of unconventional metal electrodeposition, and specifically relates to a method for synthesizing a highly preferential orientation aluminum coating by using ionic liquid and using toluene as an additive in a supergravity environment. Background technique [0002] Aluminum is the most abundant metal element in the earth's crust and has good physical and chemical properties. Aluminum-based alloys are widely used in various industries: such as automobiles and aircrafts. Aluminum has good electrical conductivity second only to silver and copper, and because of its low density and corrosion resistance, it is widely used in cables. In addition, the dense oxide film on the surface of aluminum makes it more resistant to corrosion, so it is more valuable in transportation pipelines. Also aluminum has good thermal conductivity and is used in the manufacture of heat exchangers and as a heat dissipation material. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/00C25D3/44
Inventor 徐联宾潘志云陈建峰单南南
Owner BEIJING UNIV OF CHEM TECH