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Preparation method of ZIF-8-doped high-corrosion-resistance micro-arc oxidation composite coating

A technology of ZIF-8 and micro-arc oxidation, which is applied in the direction of coating, anodic oxidation, surface reaction electrolytic coating, etc., can solve the problems of corrosion resistance influence, restrict the application of micro-arc oxidation coating, etc., and achieve the improvement of corrosion resistance , cost reduction, simple system components

Pending Publication Date: 2022-08-05
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of micro-arc oxidation, due to the influence of spark discharge, there are generally many micropores inside the micro-arc oxidation coating, which greatly affects the corrosion resistance, which restricts the application of micro-arc oxidation coatings in corrosive environments.

Method used

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  • Preparation method of ZIF-8-doped high-corrosion-resistance micro-arc oxidation composite coating
  • Preparation method of ZIF-8-doped high-corrosion-resistance micro-arc oxidation composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of ZIF-8 particles: Dissolve dimethylimidazole and hexahydrate zinc nitrate in dimethylformamide in turn, then add ethylenetriamine, dimethylimidazole, hexahydrate zinc nitrate, dimethylformamide The molar ratio with ethylenetriamine is 1:1:8.36:0.044, the pH of the aforementioned solution is adjusted to 9.2 with a concentration of 10mol / L sodium hydroxide solution, and the white emulsion is obtained by ultrasonic stirring for 1h for 3h, and the stirring speed is 300 rpm, and centrifuged to obtain a white solid, which was washed alternately with methanol and deionized water for 4 times, and then vacuum-dried at 40 °C to obtain a white powdery ZIF-8 micron-sized material.

[0028] (2) Workpiece treatment: The micro-arc oxidation anode material is 6061 aluminum alloy, which is processed into a rectangular sample of 35mm × 30mm × 5mm, and the hole is drilled just above the top of the sample, and the diameter of the hole is 3mm. Grind the front and side of t...

Embodiment 2

[0038] (1) Preparation of ZIF-8 particles: Dissolve dimethylimidazole and hexahydrate zinc nitrate in dimethylformamide in turn, then add ethylenetriamine, dimethylimidazole, hexahydrate zinc nitrate, dimethylformamide The molar ratio of ethylenetriamine and ethylenetriamine is 3:1:8.36:0.044, the pH is adjusted to 9.2 with sodium hydroxide solution with a concentration of 10 mol / L, and the white emulsion is obtained by ultrasonic stirring for 1 h for 3 h. After centrifugation, a white emulsion is obtained. The solid was washed alternately with methanol and deionized water for 4 times, and then dried under vacuum at 50 °C to obtain a white powdery ZIF-8 micron material.

[0039] (2) Workpiece processing: refer to the method described in Example 1.

[0040] (3) Electrolyte configuration: put 1.5 L of deionized water in a 2 L container, add the ZIF-8 particles prepared in step (1) in an amount of 2 g / L, and use an ultrasonic device with a power of 25 W. 8 g / L of sodium silicate...

Embodiment 3

[0044] (1) Preparation of ZIF-8 particles: Dissolve dimethylimidazole and hexahydrate zinc nitrate in dimethylformamide in turn, then add ethylenetriamine, dimethylimidazole, hexahydrate zinc nitrate, dimethylformamide The molar ratio of ethylenetriamine and ethylenetriamine is 5:1:8.36:0.044, the pH of the sodium hydroxide solution with a concentration of 10 mol / L is adjusted to 9.2, and the white emulsion is obtained by ultrasonication for 1 h and 3 h, which is obtained by centrifugation. The white solid was washed alternately with methanol and deionized water for 4 times, and then dried under vacuum at 60 °C to obtain a white powdery ZIF-8 micron material.

[0045] (2) Workpiece processing: refer to the method described in Example 1.

[0046] (3) Electrolyte configuration: put 1.5 L of deionized water in a 2 L container, add the ZIF-8 particles prepared in step (1) in an amount of 1 g / L, and use an ultrasonic device with a power of 25 W. 5 g / L of sodium silicate nonahydrat...

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Abstract

The invention discloses a preparation method of a ZIF-8-doped high-corrosion-resistance micro-arc oxidation composite coating, which comprises the following steps: dissolving dimethylimidazole and zinc nitrate hexahydrate in dimethylformamide, adding ethylene triamine, adjusting the pH to be alkaline, ultrasonically stirring, centrifugally separating to obtain a white solid, washing and drying to obtain ZIF-8 particles; the preparation method comprises the following steps: adding ZIF-8 particles into deionized water, carrying out ultrasonic dispersion, and dissolving sodium silicate nonahydrate, potassium hydroxide and sodium hexametaphosphate into the deionized water to prepare an electrolyte; and putting the aluminum alloy workpiece as an anode into the prepared electrolyte, taking graphite as a cathode, and carrying out micro-arc oxidation treatment on the aluminum alloy workpiece in a constant-current mode by adopting a pulse direct-current power supply. The composite coating has an excellent barrier effect, and corrosion ions in seawater are prevented from entering the coating. And meanwhile, ZIF-8 contains a corrosion-inhibition imidazolyl ligand which is adsorbed on the metal surface, so that a matrix is prevented from being corroded, and the corrosion resistance of the matrix is improved.

Description

technical field [0001] The invention relates to the preparation of a high corrosion-resistant composite coating, in particular to a preparation method of a ZIF-8 doped high-corrosion-resistant micro-arc oxidation composite coating, and belongs to the technical field of anti-corrosion materials in a marine environment. Background technique [0002] As a common material in the marine equipment manufacturing industry, 6061 aluminum alloy has been used more and more in the shipbuilding industry because of its light weight, high specific strength, easy processing and low temperature resistance and other properties. However, aluminum alloys have the disadvantages of low hardness, poor wear resistance, and poor corrosion resistance in marine environments, which limit the use of aluminum alloys in the marine field. The micro-arc oxidation technology, as a new surface treatment technology, can prepare a ceramic film layer with good wear resistance, corrosion resistance and electrical...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/02C25D11/16C25D15/00C08G83/00
CPCC25D11/06C25D11/16C25D11/026C25D15/00C08G83/008
Inventor 杨含林修洲窦宝捷赵薇杨丹阳栋宇罗蓝余柳丝
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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