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Method for preparing super-hydrophobic Zn-Fe alloy coating through electro-deposition in eutectic ionic liquid

A technology of ionic liquid and alloy coating, which is applied in the fields of anti-corrosion, electrodeposition, and surface treatment. It can solve problems such as difficulty in obtaining coatings and large differences, and achieve the effects of simple process control, easy contact with outside air, and contact with outside air.

Active Publication Date: 2021-07-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the standard electrode potentials of zinc and iron are -0.76V and -0.44V, respectively. There is a big difference between the two, and it must be co-deposited by a suitable complexing agent. Even so, due to the abnormal co-deposition phenomenon of zinc and iron, It is difficult to obtain a coating with an appropriate distribution range of iron content in the same bath system

Method used

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  • Method for preparing super-hydrophobic Zn-Fe alloy coating through electro-deposition in eutectic ionic liquid
  • Method for preparing super-hydrophobic Zn-Fe alloy coating through electro-deposition in eutectic ionic liquid
  • Method for preparing super-hydrophobic Zn-Fe alloy coating through electro-deposition in eutectic ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Alkaline cleaning and degreasing: Use alkaline cleaning solution to remove the grease and organic matter on the surface of the substrate, and then wash the sample with deionized water. The components of the alkaline cleaning solution are: sodium hydroxide 15.0g / L, isopropanol 10.0g / L, nonylphenol polyoxyethylene ether 0.5g / L, sodium benzenesulfonate 0.5g / L. The alkali washing temperature is 35°C and the time is 2min.

[0050] (2) pickling activation: use pickling to remove the oxide film and metal impurities on the surface of the material, and then wash it with deionized water. The composition of pickling solution is: HCl30.0mL / L, Na 2 S 2 o 8 10.0g / L, fatty alcohol polyoxyethylene ether 1.0g / L. The pickling temperature is 25°C and the time is 1min.

[0051] (3) Dehydration: Dehydrate the matrix in absolute ethanol for 3 minutes, and set aside.

[0052] (4) Place choline chloride and ethylene glycol in a vacuum drying oven at 120°C for 24 hours and dry them fo...

Embodiment 2

[0058] (1) Repeat steps (1)-(3) in Example 1 to carry out pretreatment on the substrate.

[0059] (2) Choline chloride and ethylene glycol were dried in a vacuum oven at 120°C for 24 hours, cooled to room temperature and heated at 80°C for 4 hours with a molar ratio of 1:1.5 to form a clear and transparent solution.

[0060] (3) in the deep eutectic ionic liquid in step (2), add the zinc chloride of 20.0g / L, the ferrous chloride of 3.0g / L, then add the deionized water of plating solution total amount 3.0wt% and Add 2 wt% ethanol and 3.0 wt% methyl nonafluorobutyl ether in the total amount of the plating solution, and stir until the solution becomes clear and transparent.

[0061] (4) Electrodeposition: The anode of electrodeposition is titanium mesh, the cathode is aluminum alloy sheet, the distance between cathode and anode is 20mm, and the current density is 250mA / cm 2 , the temperature is 70°C, the stirring speed is 300rpm, the pH of the plating solution is adjusted to 8.5...

Embodiment 3

[0065] (1) Repeat steps (1)-(3) in Example 1 to carry out pretreatment on the substrate.

[0066] (2) Place choline chloride and ethylene glycol in a vacuum drying oven at 120°C for 24 hours, then cool to room temperature and heat them at 80°C for 4 hours with a molar ratio of 1:3 to form a clear and transparent solution .

[0067] (3) in the eutectic ionic liquid in step (2), add the zinc oxide of 15.0g / L, the ferrous chloride of 2.0g / L, add the propanol of plating solution total amount 1.0wt% and plating solution total amount again Measure 5.0wt% ethylene glycol butyl ether and stir until the solution is clear and transparent.

[0068] (3) Electrodeposition: The electrodeposition anode is a titanium plate, the cathode is a pure copper sheet, the distance between the cathode and the anode is 10mm, and the current density is 300mA / cm 2, the temperature is 80°C, the stirring speed is 500rpm, the pH of the plating solution is adjusted to 9.0 with diethanolamine, and the electr...

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Abstract

The invention relates to a method for preparing a super-hydrophobic Zn-Fe alloy coating through electro-deposition in eutectic ionic liquid, and belongs to the field of electro-deposition. According to the method, a zinc source, an iron source, a solubilizer, a viscosity reducer, a pH regulator and the like are dissolved in the eutectic ionic liquid with choline chloride and ethylene glycol being a hydrogen bond acceptor and donor to prepare electrolyte; and in the electro-deposition process, electro-deposition is carried out for 10-60min at the constant current of 10-500mA / cm<2> under the temperature of 40-90 DEG C to obtain the super-hydrophobic Zn-Fe alloy coating with good corrosion resistance. According to the super-hydrophobic Zn-Fe alloy coating, the iron content ranges from 1wt% to 20wt%, the water contact angle is greater than or equal to 160 degrees, the rolling angle is smaller than or equal to 4 degrees, and good hydrophobic performance and corrosion resistance are shown. The method is easy to operate, safe and reliable, the electro-deposition process is free of hydrogen evolution and other side reactions, the current efficiency is high, the coating does not need passivation treatment, the plating solution is easy to recycle, and the method is an environment-friendly method for preparing the super-hydrophobic Zn-Fe alloy coating.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic Zn-Fe alloy coating by electrodeposition in a deep eutectic ionic liquid, which belongs to the field of surface treatment, in particular to the field of electrodeposition technology, and is mainly used in anticorrosion fields such as petroleum, machinery, bridges, and chemical industry. [0002] technical background [0003] With the development of science and technology and modern industry, the quality requirements for protective coatings are getting higher and higher. The traditional electroplating pure zinc layer can no longer fully meet the anti-corrosion needs of offshore oil drilling platforms, bridges, chemicals, automobiles and other industries. To this end, people have taken a series of measures, the most effective method of which is electroplating zinc alloys, such as Zn-Fe, Zn-Co, Zn-Ni, Zn-Ti, Zn-Al, Zn-Mn, Zn-Sn, etc. Alloy coatings have much higher wear resistance than pure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/34
CPCC25D3/565C25D5/34Y02P20/54
Inventor 周国庆王文昌张然王世颖吴敏娴秦水平光崎尚利陈智栋
Owner CHANGZHOU UNIV
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