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Voltage step micro-arc oxidation method

A micro-arc oxidation and voltage step technology, applied in the field of surface engineering, can solve the problems of high cost, high energy consumption, low efficiency, etc., and achieve the effect of reducing heat loss, saving equipment cost and reducing load

Inactive Publication Date: 2008-10-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a voltage step micro-arc oxidation method for the problems of "high cost, high energy consumption and low efficiency" in the existing micro-arc oxidation technology

Method used

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  • Voltage step micro-arc oxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Make the working area 10cm each 2 The two AZ91D magnesium alloy samples were ground sequentially from coarse to fine to 1000 # Water abrasive paper, rinsed with tap water, distilled water and absolute ethanol successively, and then dried with hot air. After being connected to the wires, immerse in 1000ml of 10g / L sodium metaaluminate water-based solution. At room temperature (30±2°C), use an AC power supply with a rated voltage of 600V and a rated power of 6kW at a frequency of 50Hz in accordance with the following parameters. Micro-arc oxidation treatment: in ΔU ini = 200V start applied voltage to υ ‾ = 2 V / min , ΔT n ≈Δt n =4min, ΔU P = 300V to carry out step boost respectively, the total processing time t T = 60 min. After the micro-arc oxidation, disconnect the power supply, take out the sample, rinse it with tap water and distilled water, and dry it wi...

Embodiment 2

[0044] Divide ΔU ini =80V, υ ‾ = 10 V / min , ΔT n ≈Δt n = 1min, ΔU P =200V,t T =Except 15min, other is with embodiment 1.

[0045] It was found that there was no obvious spark on the sample meter at startup, but as the voltage increased step by step, sparks were gradually produced, which started to appear cool, then gradually increased in intensity, and at the end, the micro-arc was fine, uniform, and dense. The obtained ceramic film is colorless, nearly transparent, very uniform and very smooth.

Embodiment 3

[0047] Divide ΔU ini =200V, υ ‾ = 0.5 V / min , ΔT n ≈Δt n = 10min, ΔU P =250V,t T =Except 120min, other are with embodiment 1.

[0048] Obtained phenomena and results are similar to those described in Example 1.

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Abstract

The invention discloses a voltage step micro-arc oxidation method: after surface preprocessed part and a counter electrode are respectively connected with output ports of a power source and then are steeped into a micro-plasma oxidation electrolyte, a low voltage delta U<int> is used as start voltage and applied, afterward the voltage is increased in a step way, when reaching the peak value delta, the voltage is maintained, until a total process time t<T> is finished. The method of the invention not only can effectively weak the impact to the power system caused by a current pulse which is produced at the instant when the voltage-control micro-plasma oxidation is started, obviously decrease the request to the nominal parameter of the micro-arc oxidation power source, and save the manufacture / procurement cost of the micro-arc oxidation power source, but also can improve the electric efficiency and reduce the thermal losses. Moreover, when the micro-arc oxidation method provided by the invention is used, the membrane effect can be also obviously improved, and obtains a smoother, evener and more compact ceramic membrane can be obtained.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a voltage step micro-arc oxidation method. Background technique [0002] As a material surface modification technology, micro-arc oxidation has the following outstanding advantages: First, it can realize the organic in-situ compounding of metal and ceramic materials, and realize the ceramicization of the metal surface under the premise of maintaining their respective performance advantages. At the same time, it can effectively overcome the defects of high brittleness, easy fracture and poor machinability of ceramic materials prepared by traditional sintering technology. Second, the film-forming ability is strong, there is no strict requirement for pre-treatment, and workpieces with complex geometric shapes can be processed, and all surfaces that can be in contact with the electrolyte can be ceramicized. Third, through the optimization of process parameters, the compo...

Claims

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Application Information

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IPC IPC(8): C25D11/02
Inventor 张永君
Owner SOUTH CHINA UNIV OF TECH
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