Micro-arc oxidation preparation method of high wear resistant and corrosion resistant self-lubricating ceramic layer and electrolyte thereof

A technology of micro-arc oxidation and ceramic layer, which is applied in the field of metal surface treatment, can solve the problems of poor product quality consistency and uniformity, difficult performance to meet the use requirements, high production cost, etc., to achieve convenient preparation, high extreme pressure resistance and anti-corrosion Oxidation performance and low production cost

Inactive Publication Date: 2012-01-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the fact that the current metal surface ceramic layer prepared by micro-arc oxidation is difficult to have the characteristics of high wear resistance, high corrosion resistance and low friction factor self-lubrication at the same time. The consistency and uniformity are poor, and the performance is difficult to meet the requirements of the use. It is proposed to use micron or nanometer grades with excellent self-lubricating properties, extremely low friction factors, which are not easy to decompose at high temperatures and do not react with other materials. WS 2 Particles are added to the electrolyte to achieve WS during micro-arc oxidation 2 The deposition of particles in the ceramic layer finally prepares a high-quality ceramic layer with excellent wear resistance, corrosion resistance and self-lubricating properties, providing an environment-friendly low-cost metal high wear-resistant, corrosion-resistant and self-lubricating ceramic layer Micro-arc oxidation preparation electrolyte , and also provides a micro-arc oxidation preparation method of a metal surface highly wear-resistant and corrosion-resistant self-lubricating ceramic layer

Method used

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  • Micro-arc oxidation preparation method of high wear resistant and corrosion resistant self-lubricating ceramic layer and electrolyte thereof
  • Micro-arc oxidation preparation method of high wear resistant and corrosion resistant self-lubricating ceramic layer and electrolyte thereof
  • Micro-arc oxidation preparation method of high wear resistant and corrosion resistant self-lubricating ceramic layer and electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The selected sample is AZ91D magnesium alloy, and its shape is a sheet of 30mm×15mm×5mm. The specific preparation process conditions and operation steps are as follows:

[0028] 1. Sample pretreatment: Polish the surface of the magnesium alloy sample with 400#, 600#, 800# and 1000# sandpaper successively, then degrease in acetone, rinse with deionized water, and dry it for later use;

[0029] 2. Electrolyte preparation: first mix and dissolve the reagents with concentrations of potassium hydroxide 2.0g / L, sodium silicate 6.0g / L, sodium fluoride 2.0g / L, and sodium dodecylbenzenesulfonate 60mg / L. Then add WS with a particle size of 1 μm 2 Particles 15g / L, apply ultrasonic and mechanical stirring at the same time, make WS 2 The particles are fully dispersed, and the preparation containing WS 2 Particle suspension electrolyte;

[0030] 3. Electrical parameter setting: adopt constant current mode, current density 3A / dm 2 , frequency 400Hz, duty cycle 10%, cathode-anode c...

Embodiment 2

[0035] The selected sample is AZ91D magnesium alloy, and its shape is a sheet of 30mm×15mm×5mm. The specific preparation process conditions and operation steps are as follows:

[0036] 1. Sample pretreatment: same as Example 1;

[0037] 2. Electrolyte preparation: first mix and dissolve the reagents with concentrations of potassium hydroxide 2.0g / L, sodium silicate 8.0g / L, sodium fluoride 2.0g / L, and sodium dodecylbenzenesulfonate 30mg / L. Then add WS with a particle size of 2 μm 2 Granules 20g / L, apply ultrasonic and mechanical stirring at the same time, make WS 2 The particles are fully dispersed, and the preparation containing WS 2 Particle suspension electrolyte;

[0038] 3. Electrical parameter setting: adopt constant current mode, current density 2A / dm 2 , frequency 500Hz, duty cycle 20%, cathode-anode current density ratio 1.0, reaction time 15min;

[0039] 4, micro-arc oxidation: with embodiment 1;

[0040] 5, aftertreatment: with embodiment 1.

Embodiment 3

[0042] The selected sample is AZ91D magnesium alloy, and its shape is a sheet of 30mm×15mm×5mm. The specific preparation process conditions and operation steps are as follows:

[0043] 1. Sample pretreatment: same as Example 1;

[0044] 2. Electrolyte preparation: first mix and dissolve reagents with concentrations of potassium hydroxide 4.0g / L, sodium silicate 10.0g / L, sodium fluoride 4.0g / L, and sodium dodecylbenzenesulfonate 60mg / L. Then add WS with a particle size of 900nm 2 Granules 20g / L, apply ultrasonic and mechanical stirring at the same time, make WS 2 The particles are fully dispersed, and the preparation containing WS 2 Particle suspension electrolyte;

[0045] 3. Electric parameter setting: same as embodiment 1;

[0046] 4, micro-arc oxidation: with embodiment 1;

[0047] 5, aftertreatment: with embodiment 1.

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Abstract

The invention discloses a micro-arc oxidation preparation method of a high wear resistant and corrosion resistant self-lubricating ceramic layer and electrolyte thereof, belonging to the technical field of metal surface treatment. The preparation method comprises the following steps: performing pretreatment on a sample; preparing electrolyte; setting electrical parameters; then starting a circulating cooling water device, connecting the metal sample with a conductor pole, and soaking in the electrolyte to serve as an anode, wherein a stainless steel electrolytic cell is also used as a cathode; starting a bidirectional pulse power supply, and performing micro-arc oxidation treatment; and taking out the treated sample, washing and naturally airing. The electrolyte is characterized in that: any one of potassium hydroxide and sodium citrate is mixed with the electrolyte; sodium silicate, sodium fluoride and an anionic dispersant are mixed and dissolved; and then WS2 particles are added while ultrasonic treatment and mechanical agitation are applied to prepare the electrolyte. The WS2 self-lubricating solid material used in the method has the following advantages: the material has extremely low friction coefficient and relatively high extreme pressure resistance and oxidation resistance, the price is lower than that of MoS2, and the material is difficult to decompose and cannot react with the metal substrate and reagents, etc.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method for preparing a high wear-resistant and corrosion-resistant self-lubricating ceramic layer by micro-arc oxidation and an electrolyte thereof. Background technique [0002] Micro-arc oxidation (also known as micro-plasma oxidation) is a kind of instantaneous high-temperature and high-pressure action generated by arc discharge on the surface of aluminum, magnesium, titanium, zirconium, tantalum, niobium and their alloys through the combination of electrolyte and corresponding electrical parameters. A new surface treatment technology that in-situ grows a ceramic layer based on a matrix metal oxide. The prepared ceramic layer is firmly combined with the substrate, has a compact structure, high toughness, and has good properties such as wear resistance, corrosion resistance, high temperature impact resistance, electrical insulation and the like. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02
Inventor 刘雪峰刘刚谢建新
Owner UNIV OF SCI & TECH BEIJING
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