Method for large-area deposition of coating and surface modification by cathodic plasma electrolysis

A cathode plasma and surface modification technology, applied in the direction of electrolytic inorganic material coating, etc., to achieve the effect of simple equipment, easy operation and low investment

Inactive Publication Date: 2014-11-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to solve the problem of realizing uniform cathode plasma electrolysis on large area samples

Method used

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  • Method for large-area deposition of coating and surface modification by cathodic plasma electrolysis
  • Method for large-area deposition of coating and surface modification by cathodic plasma electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] use figure 1 (b) The general electrolytic cell structure shown. With 0.5M Al(NO 3 ) 3 The aqueous solution is used as the basic electrolyte, and 10g / L of polyvinyl alcohol is added. 1Cr18Ni9Ti stainless steel (50×50×2mm in size) is used as the cathode, and a DC power supply is used. The electrolysis voltage is always controlled at a voltage higher than the arc starting voltage of 25V. 30 minutes of electrolysis can deposit Al with a thickness of 200 microns 2 o 3 coating.

Embodiment 2

[0020] use figure 1 (b) The general electrolytic cell structure shown. With 0.5M Zr(NO 3 ) 4 +0.04M Y(NO 3 ) 3 +0.0002M H 2 PtCl 6 The aqueous solution is used as the basic electrolyte, and then 10g / L of polyethylene glycol is added, and the nickel-based superalloy (the size is 50×50×2mm) is used as the cathode, and a pulse power supply is used with a frequency of 600Hz and a duty cycle of 60%. The voltage is always controlled at a voltage 25V higher than the arcing voltage. A thermal barrier coating of YSZ (yttria stabilized zirconia) dispersed Pt particles with a thickness of 250 microns can be deposited by electrolysis for 40 minutes.

Embodiment 3

[0022] use figure 1 (b) The general electrolytic cell structure shown. Use 80g / l glycerin aqueous solution as the basic electrolyte, then add 10g / L polyethylene oxide, use a 50×50×2mm low-carbon steel plate as the cathode, use a pulse power supply, the frequency is 200Hz, the duty ratio is 50%, the electrolysis voltage Always controlled at a voltage 50V higher than the arcing voltage, after 30 minutes of cathodic plasma electrolysis, a carburized coating with a thickness of about 20 microns was formed on the surface of the steel plate.

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Abstract

The invention relates to a method for large-area deposition of a coating and surface modification by cathodic plasma electrolysis. A non-ionic water-soluble polymer is added in an electrolyte, and the cathodic plasma electrolysis is carried out by adopting a conventional electrolytic tank or an electrolytic tank that sprays the electrolyte and has an anode and a cathode that moves relatively. A certain direct current voltage or impulse voltage is applied to the electrolytic tank; and the non-ionic water-soluble polymer is absorbed on the surface of a cathode material to induce uniform and continuous large-area cathodic plasma high energy micro-arc discharge, thereby deposing oxide, carbide, nitride, boride and a compound ceramic coating in large area in an electrolyte with different components, deposing a compound coating of oxide and dispersed noble metal particles in large area , and cleaning the surface of the material in the large area and realizing surface nanocrystallization of the material. The method endows materials with novel characteristics such as optics, electrics, magnetics, chemistry, electrochemistry, mechanics and biology, and has wide application in various industrial fields.

Description

technical field [0001] The invention is a large-area deposition coating and surface modification method by cathode plasma electrolysis, and relates to material coating technology and surface modification technology. The invention can deposit oxides, carbides, nitrides, borides and their composite ceramic coatings on the surface of a large area of ​​cathode materials, deposit oxides + dispersed noble metal particle composite coatings on a large area, clean the surface of materials in a large area and realize material surface nanoscale. Endow materials with new optical, electrical, magnetic, chemical, electrochemical, mechanical, biological and other properties. Background technique [0002] Plasma electrolysis is electrolysis in a specific electrolyte. When the voltage increases to a certain critical value, micro-arc discharge occurs on the surface of the anode or cathode to generate plasma, which becomes an electrolysis process involving plasma. In 1999, Yerodhin et al rev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/08
Inventor 何业东王鹏邓舜杰权成王伟泽
Owner UNIV OF SCI & TECH BEIJING
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