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Local micro-arc oxidation device and method for titanium alloy workpieces

A micro-arc oxidation and titanium alloy technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problem of large surface area of ​​ship titanium alloy workpieces, unsuitable for overall micro-arc oxidation treatment, and unsuitable for local micro-arc Oxidation and other problems, to achieve the effect of a wide range of process adaptation, convenient removal, and easy on-site construction

Inactive Publication Date: 2019-12-13
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One is that it is difficult to avoid collisions during the installation process of ship titanium alloy workpieces, thereby destroying the micro-arc oxidation film. In some areas, the micro-arc oxidation film needs to be mechanically removed for welding and installation. The damaged parts of the oxide film lose their proper protective effect
[0007] The second is that the surface area of ​​titanium alloy workpieces in ships is relatively large. After the micro-arc oxidation film in local areas is damaged, it is impossible or not suitable for overall micro-arc oxidation treatment. Individual workpieces cannot be disassembled after welding with other parts, and only on-site repair local micro-arc can be performed. oxidation
[0008] Third, the existing immersion micro-arc oxidation process and method are not suitable for partial micro-arc oxidation
However, this kind of device and equipment is only suitable for micro-arc oxidation treatment of plane or near-plane parts, and is not suitable for local micro-arc oxidation treatment of curved surfaces of workpieces such as valves, pipelines, and shafts on ships.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use the above-mentioned device to perform partial micro-arc oxidation treatment on a 1 cm × 1 cm area on the TA2 plate. First, use liquid ink to coat and mask the area that does not require micro-arc oxidation. After 6 hours of natural drying at room temperature, the ink coating layer is completely cured. Perform micro-arc oxidation on an unshielded area of ​​1cm×1cm according to the above-mentioned micro-arc oxidation process, and the stainless steel cathode nozzle is 10mm away from the surface of the workpiece; the solution component Na 3 PO 4 : 10g / L, Na 2 EDTA: 2 g / L; average current density 10A / dm 2 , the termination voltage is 550V, the pulse frequency is 500HZ, the duty cycle is 25%, and the oxidation time is 20min. Rinse the workpiece after oxidation, lift the ink layer by hand, there is no oxide film in the coated area, and an off-white micro-arc oxidation film is formed in the uncoated 1cm×1cm area.

Embodiment 2

[0037] Adjust the distance between the stainless steel cathode tube mouth and the workpiece surface to be 5mm; the solution composition Na 3 PO 4 : 20g / L, Na 2 EDTA: 1g / L; average current density 5A / dm 2 , the termination voltage is 450V, the pulse frequency is 100HZ, the duty cycle is 70%, and the oxidation time is 10min. Others are the same as embodiment 1. Rinse the workpiece after oxidation, lift the ink layer by hand, there is no oxide film in the coated area, and an off-white micro-arc oxidation film is formed in the uncoated 1cm×1cm area.

Embodiment 3

[0039] Adjust the distance between the stainless steel cathode tube mouth and the workpiece surface to be 20mm; the solution composition Na 3 PO 4 : 30g / L, Na 2 EDTA: 3g / L; average current density 2A / dm 2 , the termination voltage is 500V, the pulse frequency is 300HZ, the duty cycle is 50%, and the oxidation time is 15min. Others are the same as embodiment 1. Rinse the workpiece after oxidation, lift the ink layer by hand, there is no oxide film in the coated area, and an off-white micro-arc oxidation film is formed in the uncoated 1cm×1cm area.

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Abstract

The invention relates to a local micro-arc oxidation device and method for titanium alloy workpieces, and belongs to the technical field of titanium alloy surface treatment. The device comprises a mobile micro-arc oxidation power supply, to-be-machined workpieces, a stainless steel cathode tube, an oxidation tank, a solution circulation recovery device and a solution cooling system. The device andmethod have the beneficial effect that firstly, a region where micro-arc oxidation is not needed is shielded through the ink during use, then a local micro-arc oxidation process is used for repairingtreatment, the electric fields of the surfaces of the workpieces are restrained through the tubular stainless steel cathode tube to realize local micro-arc oxidation control on the surface of the titanium alloy, solution flows through the surfaces of the to-be-machined workpieces through a tubular stainless steel cathode port, then the solution flows back to the oxidation groove, shapes and oxidation parts of the workpieces are not explicitly required, and the process adaptation range is wide.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy surface treatment, and in particular relates to a local micro-arc oxidation device and method for a titanium alloy workpiece. Background technique [0002] Titanium and titanium alloys are widely used in submarines and surface ships due to their excellent seawater corrosion resistance, high specific strength, non-magnetic properties, and sound permeability, such as ship shells, decks, valves, wings, speedboat propellers, transmissions, etc. Shafts, steam engines, deep submarine pressure chambers, special systems and related pipelines, etc. The chemical potential of titanium alloy workpieces is relatively high, and obvious galvanic corrosion will occur when they are in contact with low-potential metals such as steel and copper in the marine environment, which will accelerate the corrosion of low-potential metals, reduce the life of the workpiece, and bring great safety to the ship Hidden da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
CPCC25D11/022C25D11/026C25D11/26
Inventor 张益豪石绪忠刘晓鹤
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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