Microarc oxidation method for quickly preparing wear-proof zirconia and alumina mixed coating on surface of zirconium alloy

A micro-arc oxidation and zirconium alloy technology, applied in the field of electrochemistry, can solve the problems of inability to form a thick film layer, mechanical peeling of the film layer, low alumina content, etc., to achieve increased film forming speed, improved performance, and wear resistance sex-enhancing effect

Inactive Publication Date: 2013-10-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In order to improve the deficiencies in the research of micro-arc oxidation coating technology at home and abroad, phosphate and silicate are mostly used as electrolytes in micro-arc oxidation at home and abroad, and the obtained film layer is a mixed film layer of monoclinic and tetragonal phases. , its wear resistance is poor. In addition, for the film layer obtained from the aforementioned low concentration of sodium aluminate (research paper [1]), there are still a series of shortcomings: such as the low content of alumina in the film, the film The layer structure is divided into inner and outer layers, and the composition is not uniform. There are problems such as mechanical peeling of the film layer for a long time, and the inability to form a thick film layer.

Method used

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  • Microarc oxidation method for quickly preparing wear-proof zirconia and alumina mixed coating on surface of zirconium alloy
  • Microarc oxidation method for quickly preparing wear-proof zirconia and alumina mixed coating on surface of zirconium alloy
  • Microarc oxidation method for quickly preparing wear-proof zirconia and alumina mixed coating on surface of zirconium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Rapid preparation of wear-resistant ZrO on the surface of zirconium alloy 2 / Al 2 o 3 Micro-arc oxidation coating methods, including:

[0057] (1) Preparation of electrolyte for micro-arc oxidation on zirconium alloy surface;

[0058] The composition of described electrolytic solution is, every 1000 ml deionized water contains:

[0059] NaAlO 2 : 32g

[0060] KOH: 1g

[0061] (2) Setting of micro-arc oxidation power supply parameters: positive current 15 A / dm 2 Negative current 10 A / dm 2

[0062] Frequency: 1000Hz

[0063] Positive and negative duty cycle: 20%

[0064] (3) Treatment of the zirconium alloy surface sample: the sample size is 10×20mm, sealed with E-44 epoxy resin, and after the sample is cured, use 800-2000# metallographic sandpaper on the surface of the zirconium alloy participating in the reaction Gradually polished, then washed with tap water, ultrasonically cleaned with alcohol, and cleaned with deionized water.

[0065] (4) The proces...

Embodiment 2

[0084] Example 2: The rest of the preparation and detection steps are the same as in Example 1, except that the electrolyte and parameters are different:

[0085] (1) Preparation of electrolyte for micro-arc oxidation on zirconium alloy surface;

[0086] The composition of described electrolytic solution is, every 1000ml deionized water contains:

[0087] NaAlO 2 : 45g

[0088] NaOH: 5g

[0089] (2) Setting of micro-arc oxidation power supply parameters: positive current 15 A / dm 2 Negative current 15 A / dm 2

[0090] Frequency: 2500Hz

[0091] Positive and negative duty cycle: 10%

[0092] The effect is the same as in Example 1, the film forming speed is fast, the film layer structure is uniform, and contains a large amount of alumina; the wear resistance of the film layer far exceeds the micro-arc obtained by ordinary zirconium alloys in low-concentration aluminate and phosphate electrolytes. Oxide film.

Embodiment 3

[0093] Example 3: The rest of the preparation and detection steps are the same as in Example 1, except that the electrolyte and parameters are different:

[0094] (1) Preparation of electrolyte for micro-arc oxidation on zirconium alloy surface;

[0095] The composition of described electrolytic solution is, every 1000ml deionized water contains:

[0096] NaAlO 2 : 60g

[0097] KOH: 10g

[0098] (2) Setting of micro-arc oxidation power supply parameters: positive current 20A / dm 2 Negative current 10 A / dm 2

[0099] Frequency: 5000Hz

[0100] Positive and negative duty cycle: 30%

[0101] The effect is the same as in Example 1, the film forming speed is fast, the film layer structure is uniform, and contains a large amount of alumina; the wear resistance of the film layer far exceeds the micro-arc obtained by ordinary zirconium alloys in low-concentration aluminate and phosphate electrolytes. Oxide film.

[0102]

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Abstract

The invention relates to the field of electrochemistry, and discloses a microarc oxidation method for quickly preparing a wear-proof zirconia and alumina mixed coating on the surface of a zirconium alloy. The microarc oxidation method comprises the steps of taking the pretreated zirconium alloy as an anode and a steel plate as a cathode, controlling the temperature of an electrolytic solution to be 10-30 DEG C, setting microarc oxidation power supply parameters, turning on a power supply, treating for 2-12min, turning off the power supply, taking the zirconium alloy out, washing the surface of the zirconium alloy with deionized water, and obtaining the wear-proof zirconia and alumina mixed coating, wherein the electrolytic solution comprises 30-60g sodium aluminate, 1-10g strong base, and 1000ml of deionized water. According to the method, the film-forming speed is high, a film layer is uniform in structure and contains a large amount of alumina, the abrasive resistance of the film layer is much higher than that of a general microarc oxidation film, obtained in an electrolytic solution with low concentration of aluminate, phosphate and the like, of the zirconium alloy.

Description

technical field [0001] The invention relates to the field of electrochemistry, and further refers to the rapid preparation of wear-resistant ZrO on the surface of zirconium alloys 2 / Al 2 o 3 Micro-arc oxidation method for hybrid coatings. Background technique [0002] Zirconium alloy is a kind of valve metal, which is widely used in high-tech technical fields due to its outstanding nuclear properties, good corrosion resistance and biocompatibility. sub-irradiation capability, with UO 2 It has good compatibility, good corrosion resistance in high temperature and high pressure water and steam, suitable strength and ductility, and sufficient high temperature strength. Therefore, it is widely used as fuel cladding and internal structural components of nuclear power reactors. And zirconium alloys are also of great value in the field of human implant materials. However, the wear resistance of zirconium alloys is lower than that of stainless steel, nickel alloys and other nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 程英亮曹金晖彭昭美
Owner HUNAN UNIV
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