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Local repairing device and method for titanium alloy micro-arc oxidation coating

A micro-arc oxidation and local repair technology, applied in the field of laser cleaning and micro-arc oxidation technology, can solve the problem of difficult to achieve local growth of micro-arc oxidation coating, and achieve the effect of improving efficiency and quality and reducing damage

Inactive Publication Date: 2021-02-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the growth of new coatings, most of the existing micro-arc oxidation processes often require the workpiece to be completely immersed in the electrolyte, which makes it difficult to achieve localized growth of the micro-arc oxidation coating.

Method used

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  • Local repairing device and method for titanium alloy micro-arc oxidation coating
  • Local repairing device and method for titanium alloy micro-arc oxidation coating
  • Local repairing device and method for titanium alloy micro-arc oxidation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Choose a stainless steel tube with a diameter of 8mm and an aperture of 5mm.

[0039] 2) Locate the position of the stainless steel tube, and the processing distance to the surface of the workpiece is 25mm

[0040] 3) Configure the electrolyte Na 2 SiO 3 5g / L, Na 2 HPO 4 5g / L, NaOH 1g / L, adjust the electrolyte flow rate to 0.5m / s.

[0041] 4) Set the laser scanning area width to 15mm.

[0042] 5) Set the laser process parameters: laser power 50W, scanning speed 1500mm / s, scanning distance 0.02mm, frequency 1000Hz, pulse width 10ns.

[0043] 6) Set the micro-arc oxidation process parameters pulse power supply current density 5A / dm 2 , The pulse frequency is 300Hz, and the duty cycle is 10%.

[0044] 7) Set the processing speed of the manipulator to 10mm / min.

[0045] 8) Turn on the laser, scan the vibrating mirror, and repair the micro-arc oxidation coating with the manipulator.

[0046] The surface of the repaired coating was inspected, and the surface qua...

Embodiment 2

[0048] 1) Choose a stainless steel tube with a diameter of 8mm and an aperture of 3mm.

[0049] 2) Locate the position of the stainless steel tube, and the processing distance to the surface of the workpiece is 15mm

[0050]3) Configure the electrolyte Na 2 SiO 3 15g / L, Na 2 HPO 4 10g / L, NaOH 3g / L, adjust the electrolyte flow rate to 2m / s.

[0051] 4) Set the laser scanning area width to 5mm.

[0052] 5) Set the laser process parameters: laser power 100W, scanning speed 2500mm / s, scanning distance 0.06mm, frequency 500Hz, pulse width 200ns.

[0053] 6) Set the micro-arc oxidation process parameters pulse power supply current density 2A / dm 2 , The pulse frequency is 500Hz, and the duty cycle is 40%.

[0054] 7) Set the processing speed of the manipulator to 5mm / min.

[0055] 8) Turn on the laser, scan the vibrating mirror, and repair the micro-arc oxidation coating with the manipulator.

[0056] The surface of the repaired coating was inspected, and the surface quali...

Embodiment 3

[0058] 1) Choose a stainless steel tube with a diameter of 8mm and an aperture of 1mm.

[0059] 2) Locate the position of the stainless steel tube, and the processing distance to the surface of the workpiece is 10mm

[0060] 3) Configure the electrolyte Na 2 SiO 3 8g / L, Na 2 HPO 4 8g / L, NaOH 2g / L, adjust the electrolyte flow rate to 1m / s.

[0061] 4) Set the laser scanning area width to 10mm.

[0062] 5) Set the laser process parameters: laser power 75W, scanning speed 2000mm / s, scanning distance 0.04mm, frequency 750Hz, pulse width 100ns.

[0063] 6) Set the micro-arc oxidation process parameters pulse power supply current density 1A / dm 2 , The pulse frequency is 1000Hz, and the duty cycle is 25%.

[0064] 7) Set the machining movement speed of the manipulator to 1mm / min.

[0065] 8) Turn on the laser, scan the vibrating mirror, and repair the micro-arc oxidation coating with the manipulator.

[0066] The surface of the repaired coating was inspected, and the surfa...

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Abstract

The invention discloses a local repairing device and method for a titanium alloy micro-arc oxidation coating, and can be used for repairing damaged micro-arc oxidation coatings on the surfaces of medium-large titanium alloy workpieces. The method comprises the following steps that firstly, a residual film layer in a failure area is removed by the aid of a laser cleaning technology, and then a newcoating is prepared on a cleaned area by the aid of a selective micro-arc oxidation technology, so that repairing of the micro-arc oxidation coating is completed. The device and the method are economical and environment-friendly, synchronous composite treatment of laser cleaning and micro-arc oxidation is truly achieved, the constraint of an electrolytic cell on the size of a workpiece in traditional immersion type micro-arc oxidation is eliminated, the surface state of the material can be improved through laser cleaning, the binding force of a newly-prepared micro-arc oxidation coating in thesubsequent process is improved, meanwhile, the flowing electrolyte can take away materials removed by laser cleaning in time, and damage of laser cleaning to the base material can be reduced.

Description

technical field [0001] The invention discloses a partial repair device and method for titanium alloy micro-arc oxidation coating, relates to laser cleaning and micro-arc oxidation technology, and can be used for repairing damaged micro-arc oxidation coating on the surface of medium and large titanium alloy workpieces. Background technique [0002] Micro-arc oxidation is a new surface treatment technology with simple process, high efficiency and green environmental protection. It is through the combination of electrolyte and corresponding parameters, on the surface of non-ferrous metals such as magnesium, aluminum, titanium and their alloys, relying on the instantaneous high temperature and high pressure generated by arc discharge, the ceramic coating mainly composed of matrix metal oxides is grown in situ. The coating has strong bonding force with the substrate, high toughness, compact structure, and has good properties such as wear resistance, corrosion resistance, high tem...

Claims

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Application Information

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IPC IPC(8): C25D11/26
CPCC25D11/26C25D11/026C25D11/024
Inventor 吴国龙王晔姚建华
Owner ZHEJIANG UNIV OF TECH
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