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Ionic liquid electroplating solution for preparing bright aluminum coating at low temperature and using method of ionic liquid electroplating solution

An ionic liquid and aluminum coating technology, applied in the field of preparing bright aluminum coating, can solve the problems of pollution, high operating temperature, equipment corrosive environment, etc., achieve clean and easy process, great application prospect, and overcome the effect of volatile

Active Publication Date: 2014-06-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of organic solvent system is relatively mature, and aluminum electroplating can be carried out at room temperature. However, organic solvents have disadvantages such as narrow electrochemical window, low conductivity, strong volatility, and flammability. not tall
Inorganic molten salt system requires high operating temperature, high energy consumption, serious equipment corrosion and environmental pollution

Method used

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  • Ionic liquid electroplating solution for preparing bright aluminum coating at low temperature and using method of ionic liquid electroplating solution
  • Ionic liquid electroplating solution for preparing bright aluminum coating at low temperature and using method of ionic liquid electroplating solution
  • Ionic liquid electroplating solution for preparing bright aluminum coating at low temperature and using method of ionic liquid electroplating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Preparation of plating solution

[0032] The electroplating solution is arranged in the glove box and is protected by inert gas. The three components of the electroplating solution are: (A) is anhydrous AlCl 3 , (B) is dried 1-ethyl-3-methylimidazole chloride, and additive (C) is pyridine-3-carboxylic acid (as shown in structural formula 3). Weigh AlCl with an apparent molar ratio of 2:1 3 And 1-ethyl-3-methylimidazole chloride, add a small amount of AlCl 3 Carefully add to 1-ethyl-3-methylimidazole chloride, wait until the AlCl is added 3 Dissolve completely, then take a small amount and continue adding until the addition is complete. After the two form a homogeneous solution, stir at 50°C for 2 to 3 hours, and the formed homogeneous transparent liquid is the composite ionic liquid (D). Add 1g / L of additive (C), stir to completely dissolve, and obtain ionic liquid / additive electroplating solution.

[0033]

[0034] Structural formula 3

[0035] 2) Plating process

[0036]...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is that the two substances (A) and (B) with an apparent molar ratio of 1.5:1 are mixed to form a composite ionic liquid (D), and the additive (C) added is 3-pyridine Formamide (as shown in structural formula 4); the current density during plating is 0.8A / dm 2 , Others are the same as in Example 1, and the mirror-bright aluminum coating can also be obtained.

[0039]

[0040] Structural formula 4

Embodiment 3

[0042] The difference between this embodiment and embodiment 1 or 2 is that the additive (C) in the preparation of the plating solution is replaced with methyl 3-picolinate (as shown in structural formula 5). Others are the same as Embodiment 1 or 2, and the mirror-finished aluminum coating can also be obtained.

[0043]

[0044] Structural formula 5

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Abstract

The invention provides an ionic liquid electroplating solution for preparing a bright aluminum coating at a low temperature and a using method thereof. The invention relates to the field of green and clean electroplating. The electroplating solution is formed by mixing anhydrous aluminum halide (A), N, N'-dialkyl imidazole halide (B) and an additive (C)-pyridine derivative, wherein an apparent molar ratio of the anhydrous aluminum halide (A) to the N, N'-dialkyl imidazole halide (B) is 1:1-3:1; and the addition amount of the additive (C) is 0.5-15g / L. The operating conditions are that the cathode current density is 0.5-5A / dm<2> under inert gas protection, the plating solution temperature is 25-100 DEG C, the plating time is 10-120minutes, and the stirring speed is 0-500 revolutions per minute. According to the method, the defects that an organic solvent system is narrow in electrochemical window, low in conductivity, high in volatility and simple in combustions and an inorganic fused salt system is high in operating temperature, high in energy consumption and severe in equipment corrosion and environmental pollution and the like are overcome, the obtained coating is low in emissivity and high in purity, the thickness of the coating is easily controlled, and the plating solution can be repeatedly used by quantitatively supplementing additives at fixed time.

Description

Technical field [0001] The invention relates to the field of green and clean electroplating, and specifically refers to a new method for preparing bright aluminum coatings by adding additives to ionic liquids. Background technique [0002] The bright aluminum coating is light, non-toxic, good in thermal conductivity, corrosion resistance and oxidation resistance, and has the advantages of significantly reducing emissivity. It is used as the bottom film in the solar selective absorption coating. At present, the aluminum film is often obtained by vacuum evaporation, thermal spraying, magnetron sputtering and other processes. The higher working temperature of these processes affects the mechanical properties of the matrix material, and requires expensive instruments and equipment, so they are greatly restricted in large-scale industrial applications. [0003] The electroplating aluminum has mild reaction conditions, simple and cheap equipment required, and the obtained coating has hi...

Claims

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Application Information

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IPC IPC(8): C25D3/44
Inventor 王倩张锁江张亲亲郑勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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