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Method for controlling micro-arc oxidation electricity parameters under peak current output mode

A technology of micro-arc oxidation and peak current, which is applied in the field of surface engineering, can solve the problems of excessive process energy consumption, high processing cost, and low processing efficiency, and achieve the goals of reducing heat loss, improving film forming efficiency, and improving energy utilization. Effect

Inactive Publication Date: 2013-02-13
NANJING HAORANG ENVIRONMENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a micro-arc oxidation electrical parameter control method under the peak current output mode to overcome the problems of excessive process energy consumption, high processing cost and low processing efficiency existing in the existing micro-arc oxidation technology

Method used

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  • Method for controlling micro-arc oxidation electricity parameters under peak current output mode
  • Method for controlling micro-arc oxidation electricity parameters under peak current output mode
  • Method for controlling micro-arc oxidation electricity parameters under peak current output mode

Examples

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Effect test

Embodiment 1

[0028] Set the area to 1dm 2 The AZ31 magnesium alloy samples were polished with 400#, 800# and 1200# water sandpaper from coarse to fine, successively washed with tap water, distilled water and absolute ethanol, and then dried with hot air; As the anode and the stainless steel as the cathode, after connecting to the output port of the DC pulse power supply respectively, the magnesium alloy is immersed in the silicate system electrolyte for micro-arc oxidation treatment. The silicate system electrolyte is composed of silicic acid Sodium 5g / L, potassium hydroxide 11g / L and potassium fluoride 7g / L, the solvent is distilled water; first set the initial electrical parameters on the micro-arc oxidation power supply (model MAO-15 / 1500): Ip 1 =400A / dm 2 , Δt 1 =10us,N 1 =500, then start the power supply and last for t 1 =30s, after energizing for 20s, a uniform arc discharge phenomenon appears on the surface of the pretreatment part, and at the same time the surface ceramic layer...

Embodiment 2

[0032] Set the area to 1dm 2 The LY12 aluminum alloy samples were polished with 400#, 800# and 1200# water sandpaper from coarse to fine, successively washed with tap water, distilled water and absolute ethanol, and then dried with hot air; As the anode and the stainless steel as the cathode, respectively connected to the output ports of the DC pulse power supply, the aluminum alloy is immersed in the silicate system electrolyte for micro-arc oxidation treatment. The silicate system electrolyte is composed of silicic acid according to the weight to volume ratio Sodium 15g / L, potassium hydroxide 5g / L and sodium hexametaphosphate 10g / L, the solvent is distilled water; first set the initial electrical parameters on the micro-arc oxidation power supply (model MAO-15 / 1500): Ip 1 =600A / dm 2 , Δt 1 =20us,N 1 =500, then start the power supply and last for t 1 =30s, 27s after electrification, uniform arc discharge phenomenon appears on the surface of the pretreatment part, and at t...

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Abstract

The invention provides a method for controlling micro-arc oxidation electricity parameters under a peak current output mode, comprising the following steps of: respectively connecting a pre-treated piece as an anode and stainless steel as a cathode with an output port of a direct-current pulse power supply; immersing in micro-arc oxidation electrolyte; setting initial electricity parameters, wherein pulse peak current density is Ip1, pulse width delta is t1; pulse number is N1 and duration time is t1; undergoing an arc discharge phenomenon on the surface of the pre-treated piece within t1 andsimultaneously, forming a ceramic layer on the surface, and beginning to enter a growth thickening stage; in the event of not shutting off the power supply, under the conditions of ensuring that the average current Ia output is as low as possible and the growth of the ceramic layer can be kept, gradually reducing the value of Ip on the basis of Ip1, and gradually increasing the values of delta t and N on the basis of delta t1 and N1 to rapidly thickening the ceramic layer; and, when the ceramic layer achieves the pre-set thickness, taking out a work-piece; washing; and drying. The method disclosed by the invention has the benefits as follows: the heat loss can be reduced; and the smooth and uniform ceramic layer can be obtained.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a method for controlling electric parameters of micro-arc oxidation under peak current output mode. Background technique [0002] Micro-arc oxidation treatment is to use light alloy products as anodes and stainless steel as cathodes, and place them in the electrolyte in a pulsed electric field environment to cause micro-arc discharges on the surface of the products to form a self-oxide ceramic layer that is metallurgically combined with the substrate. Compared with other surface treatment technologies, micro-arc oxidation technology has the following advantages: First, this process can be regarded as a cleaning treatment that neither consumes the cathode nor consumes the solute elements of the electrolyte, and can realize the organic raw materials of metal and ceramic materials. Bit recombination, to realize the ceramicization of the metal surface under th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04
Inventor 蒋百灵葛延峰李均明高翔
Owner NANJING HAORANG ENVIRONMENT SCI & TECH