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Coating large-area continuous deposition and surface modifying method

A surface modification, large-area technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc.

Active Publication Date: 2017-11-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of uniformly depositing coatings and surface modification on large-area metal surfaces with complex configurations by improving the plasma electrolytic deposition electrolytic cell

Method used

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  • Coating large-area continuous deposition and surface modifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] use figure 1 In the electrolytic cell with the double-layer solution distribution structure shown, the cathode is moved longitudinally at a constant rate to carry out the cathode plasma electrodeposition coating under the condition that the area ratio of the anode and the cathode is kept constant (greater than 2). The upper electrolyte was 30 g / L NiSO 4 ·6H 2 O aqueous solution is the basic electrolyte, add 20g / L polyethylene glycol, and add 20ml / LH 2 SO 4The electrolyte is acidic, and the organic solution in the lower layer is a tetrachlorethylene solution. The 6061 aluminum alloy of 100mm×10mm×1.5mm is used as the cathode, and the platinum sheet is used as the anode. The pulse power supply is used with a frequency of 2000Hz and a duty cycle of 90%. The electrolysis voltage is always controlled at a voltage higher than the arc starting voltage of 20V. The thickness of the electrolyte layer in the upper layer of the tank is controlled at about 15 mm, and the cathode...

Embodiment 2

[0024] use figure 1 In the electrolytic cell with the double-layer solution distribution structure shown, the cathode is moved longitudinally at a constant rate to perform the cathode plasma electrolytic nitriding treatment under the condition that the area ratio of the anode and the cathode remains unchanged (greater than 2). The upper electrolyte uses a solution with a weight ratio of urea to water of 1:2 as the basic electrolyte for nitriding, where the concentration of urea is 0.33 g / ml, and 0.013 g / ml NH 4 Cl is used as a conductive agent, 10g / L polyethylene glycol is added, and the organic solution of the lower floor is a tetrachlorethylene solution. The Q235 carbon steel material is used as the cathode, and the platinum sheet is used as the anode. Using DC power supply, the electrolysis voltage is always controlled at a voltage 30V higher than the arcing voltage, the thickness of the aqueous electrolyte layer on the upper layer of the electrolytic cell is controlled at...

Embodiment 3

[0026] use figure 1 In the electrolytic cell with the double-layer solution distribution structure shown, the cathode is moved longitudinally at a constant rate to carry out the cathode plasma electrodeposition coating under the condition that the area ratio of the anode and the cathode is kept constant (greater than 2). The upper electrolyte is 0.8 mol / l Al(NO 3 ) 3 The aqueous solution is used as the basic electrolyte, 15g / L polyethylene glycol is added, and the organic solution in the lower layer is a tetrachlorethylene solution. The NiCrAlY alloy is used as the cathode, and the platinum sheet is used as the anode. Using a pulse power supply, the frequency is 500Hz, the duty cycle is 60%, the electrolysis voltage is always controlled at a voltage 50V higher than the arcing voltage, the thickness of the electrolyte layer in the upper aqueous solution of the electrolytic cell is controlled at about 15mm, and the vertical direction of the cathode is 0.05mm / s After the depos...

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Abstract

The invention discloses a coating large-area continuous deposition and surface modifying method and belongs to the technical field of material surfaces. According to the method, cathode plasma electrolysis adopts electrolytic cell solutions with heavy organic liquid on the lower layer and an aqueous solution electrolyte on the upper layer. By controlling an electrode to be immersed into the electrolyte from the liquid surface, cathode metal is subjected to coating deposition or surface modifying treatment through plasma discharge in the aqueous solution electrolyte layer. By adjusting the area ratio of an anode to a cathode and applying the direct voltage or the pulse voltage to the cathode and the anode of an electrolytic cell, and in electrolytes of different components, oxides, carbides, borides and composite ceramic coatings can be deposited on the surface of the metal, and various metals such as nickel, copper, chromium and cadmium or metal composite coatings can be also deposited; and meanwhile, by introducing carbides and nitrides into the solutions, plasma nitriding, plasma carburizing or plasma carbonitriding of the metal cathode can be further achieved, besides, the material surface can be cleaned, oxides can be removed, and nanocrystallization of the material surface can be achieved.

Description

technical field [0001] The invention belongs to the technical field of material surface coating and modification, and relates to a large-area continuous deposition coating and a surface modification method, in particular to a cathode plasma electrolysis continuous large-area deposition coating and surface modification of a double-liquid layer electrolytic cell. sexual technology. Background technique [0002] Due to the advantages of simple equipment and high-efficiency process, plasma electrodeposition technology has attracted much attention in the field of coating preparation and surface modification in recent years. Plasma electrolytic deposition is completed in solution, and a certain voltage is applied between the cathode and anode electrodes. When the voltage exceeds a certain critical value, the potential at the interface between the electrode and the solution increases sharply, and the resulting high field strength It can break down the passivation film, gas film an...

Claims

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Application Information

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IPC IPC(8): C25D5/04C25D5/18C25D3/02C25D3/12C25D11/00C25D9/08C25F1/06
CPCC25D3/02C25D3/12C25D5/04C25D5/18C25D9/08C25D11/00C25F1/06
Inventor 吴俊升何业东李晓刚纪若男王怡戎万张津王德仁
Owner UNIV OF SCI & TECH BEIJING
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