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Electrolyte and technology for preparing ceramic coating formed by plasma micro-arc oxidation on zirconium alloy surface

A technology of surface plasma and micro-arc oxidation, which is applied in the field of improving wear resistance and corrosion resistance of zirconium and its alloys, to achieve the effects of low processing requirements, improved service life, wear performance and corrosion resistance

Inactive Publication Date: 2010-05-26
INNER MONGOLIA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no composite electrolyte suitable for preparing large-thickness, high wear-resistant and corrosion-resistant zirconia ceramic layers.

Method used

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  • Electrolyte and technology for preparing ceramic coating formed by plasma micro-arc oxidation on zirconium alloy surface
  • Electrolyte and technology for preparing ceramic coating formed by plasma micro-arc oxidation on zirconium alloy surface
  • Electrolyte and technology for preparing ceramic coating formed by plasma micro-arc oxidation on zirconium alloy surface

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Experimental program
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Effect test

Embodiment 1

[0026] (1) After dissolving the solute main salt sodium tripolyphosphate, auxiliary salt sodium tungstate, alkali sodium hydroxide and stabilizer edetate disodium in deionized water respectively, according to the main salt, auxiliary salt, The order of stabilizer and alkali is injected into the electrolytic cell in sequence, and deionized water is added to make the electrolyte reach the specified concentration conditions; the concentration of each component, the pH value of the electrolyte at 20°C and the conductivity of the electrolyte are shown in Table 1.

[0027] (2) Zirconium alloy surface treatment: After grinding and cleaning the corrosion products and oil stains on the zirconium alloy surface with sandpaper, rinse the surface of the zirconium alloy with flowing water and absolute ethanol in sequence, test the degreasing effect by water wetting method, and dry the zirconium alloy surface ready for use;

[0028] (3) Micro-arc oxidation process:

[0029] The zirconium al...

Embodiment 2

[0040] (1) After dissolving the solute main salt sodium silicate of the electrolyte, auxiliary salt sodium tungstate, alkali potassium hydroxide and stabilizer ethylenediaminetetraacetic acid with deionized water respectively, according to the main salt, auxiliary salt, stabilizer and The alkali is injected into the electrolytic cell in sequence, and deionized water is added to make the electrolyte meet the specified conditions; the concentration of each component, the pH value of the electrolyte at 20°C and the conductivity of the electrolyte are shown in Table 4.

[0041] (2) Zirconium alloy surface treatment: After grinding and cleaning the corrosion products and oil stains on the zirconium alloy surface with sandpaper, rinse the surface of the zirconium alloy with flowing water and absolute ethanol in sequence, test the degreasing effect by water wetting method, and dry the zirconium alloy surface ready for use;

[0042] (3) Micro-arc oxidation process:

[0043] The zirco...

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Abstract

The invention discloses an electrolyte and technology for preparing a ceramic coating formed by plasma micro-arc oxidation on a zirconium alloy surface. The technology comprises the following steps: (1) preparing the electrolyte; (2) treating the zirconium alloy surface; and (3) carrying out the micro-arc oxidation technology. The invention has the advantages that the electrolyte is water solution of various compounds, can provide a micro-arc discharge center, and has proper acidity and alkalinity, good ionic conductivity and chemical stability; the solutes of the electrolyte have wide source and low price; the treatment of the zirconium alloy surface has low requirement, and the micro-arc oxidation technology is simple and convenient in control; the ceramic coating formed by micro-arc oxidization has larger thickness, and by adjusting the formula of the electrolyte and the conditions of the micro-arc oxidation technology, the thickness of the ceramic coating can be controlled in a range of 30-80 micrometers; and the ceramic coating has good wear resistance and corrosion resistance.

Description

Technical field: [0001] The invention relates to an electrolyte and a process for preparing a ceramic layer on the surface of a zirconium alloy by using plasma micro-arc oxidation technology, which belongs to the field of surface modification of metal materials and is mainly suitable for improving wear resistance and corrosion resistance of zirconium and its alloys. Background technique: [0002] The preparation of ceramic coatings on metal substrates can organically combine the strength, toughness and ease of processing of metal materials with the characteristics of high temperature resistance, wear resistance and corrosion resistance of ceramic materials, so that this composite material has superior comprehensive properties. performance. Zirconium alloys have become the main structural materials of nuclear reactors due to their low thermal neutron absorption cross section, suitable strength and ductility, and good corrosion resistance. In recent years, with the rapid deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 郭锋李鹏飞田春雨邹本惠王双牛小平
Owner INNER MONGOLIA UNIV OF TECH
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