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Method for electroplating aluminum in ionic liquid

An ionic liquid and solution technology, applied in the field of electroplating aluminum, can solve the problems of easy shedding, low current efficiency, high cost, etc., and achieve the effect of dense and uniform surface, low operating temperature and low environmental requirements

Inactive Publication Date: 2012-12-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many researches and reports on ionic liquid electroplating aluminum. For example, in the invention patent of CN102206841A "Preparation method of ionic liquid electrodeposited aluminum film on the surface of aluminum-based composite materials", quaternary ammonium salts, pyridine Salts, imidazolium salts, anhydrous aluminum chloride and additives are configured to obtain the electroplating solution for electrodeposition rate, but the cost of this method is high, and the obtained ionic liquid is more sensitive to water and air, which affects the effect of ionic liquid on electrodeposited aluminum film ; Another example is that the publication number is CN102206841A in the invention patent of "a kind of electroplating aluminum solution", which adopts the plating solution composed of xylene, triethylaluminum, sodium fluoride and additives to carry out electroplating aluminum, and the current efficiency of this method is relatively low, and There are dangers of inflammability and explosion in the plating solution; in addition, there are some methods of electroplating aluminum, but most of them have problems such as high cost, low current efficiency, sensitivity to water and air, insufficient brightness of the obtained coating, and easy peeling off.

Method used

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  • Method for electroplating aluminum in ionic liquid
  • Method for electroplating aluminum in ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step 1. Weigh urea, sodium bromide and potassium bromide respectively in a molar ratio of 80%, 18% and 2%, disperse them in a dry beaker and seal them, place them in a vacuum drying oven at 80°C and heat them for 4 hours. After it is completely dissolved, add an equal volume of formamide, stir magnetically to make it fully mixed, and filter through a funnel to obtain a colorless and transparent liquid.

[0047] Take the above liquid into a three-necked flask, and slowly add 1.5 mol / L of anhydrous AlCl under the condition of magnetic stirring at 80°C 3 , after the feeding was completed, magnetically stirred at 80°C for 2 hours to obtain a light yellow translucent ionic liquid, which was sealed for later use.

[0048] Step 2: Take 50ml of the ionic liquid prepared above and place it in an electrolytic cell, use a 1cm×1cm copper sheet as the cathode, and a 1cm×2cm high-purity aluminum sheet as the anode. The cathode is polished, alkaline washed to remove oil, acid activat...

Embodiment 2

[0052] Based on the method of the above-mentioned embodiment 1, the method described in the embodiment 2 is to use the pulse electroplating power supply to carry out the electroplating for 45 minutes, and the thickness of the obtained aluminum coating is 9 μm, and the brightness of the coating is better than that of the embodiment 1 by visual inspection, and the bonding strength meets the first-class standard. After 96 hours of neutral salt spray test, the coating still has no rust spots.

Embodiment 3

[0054] Step 1. Weigh a certain amount of urea, sodium bromide, and potassium iodide in a molar ratio of 78%: 19%: 3%, respectively, and disperse them in a dry beaker and seal them, and heat them in a vacuum oven at 80°C for 5 hours. After it was completely dissolved, an equal volume of DMF was added, stirred by magnetic force to make it fully mixed, and then filtered through a funnel to obtain a colorless and transparent liquid. Take a certain amount of the above liquid into a three-necked flask, and slowly add 2 mol / L of anhydrous AlCl under the condition of magnetic stirring at 80°C 3 , after the addition, magnetically stirred at 80°C for 2 hours to obtain a light yellow translucent ionic liquid, which was sealed for later use.

[0055] Step 2: Take 50ml of the above-mentioned ionic liquid and place it in an electrolytic cell, use 1cm×2cm copper as the cathode, and 1cm×2cm high-purity aluminum sheet as the anode. The cathode is polished, alkaline washed to remove oi...

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Abstract

The invention provides a method for electroplating aluminum in ionic liquid. The method solves problems that the conventional electroplating aluminum technology has the advantages that energy is consumed, cost is high, a plating liquid environment is rigorous, and the obtained aluminum coating has poor brightness and is easy to be dropped and the like. The method comprises the following steps of: uniformly mixing the liquid which is obtained by heating and mixing urea, halons and amide with aluminum chloride anhydrous so as to obtain the ionic liquid served as the electroplating liquid; controlling an electroplating temperature, current density and electroplating time so as to carry out electroplating; and then glaring through nitric acid solution; and passivating via potassium permanganate solution. The method has lower cost of electroplating, and is stable in electroplating technology, and environment-friendly; and the obtained aluminum coating surface is dense and uniform, and has good brightness, and can be combined with a base body greatly; and the method is suitable for protecting and decorating a surface of a common material.

Description

technical field [0001] The invention relates to a method for electroplating aluminum, in particular to a technical proposal of a method for electroplating aluminum in an ionic liquid. Background technique [0002] Aluminum has properties such as oxidation resistance, corrosion resistance, decoration, and metallic luster. It is a high energy consumption process. Aluminum electroplating is usually carried out at close to normal temperature. It does not require expensive instruments and equipment and will not affect the performance of the substrate due to high working temperature. Moreover, the aluminum coating obtained with low energy consumption has low porosity, high purity, and easy control of thickness and quality. . [0003] The activity of metal aluminum determines that the coated aluminum can only be obtained in non-aqueous solvents, and the ionic liquid provides an ideal reaction medium for electroplated aluminum due to its good physical and chemical properties. As ...

Claims

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Application Information

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IPC IPC(8): C25D3/66C25D3/44
Inventor 梁振海杨志闫瑞景王俊文郝晓刚樊彩梅
Owner TAIYUAN UNIV OF TECH
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