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A corrosion-resistant protection method for micro-arc oxidation of aluminum alloy welded joints in high-speed trains

A technology of welding joints and micro-arc oxidation, which is applied in anodic oxidation, electrolytic process, electrolytic components, etc.

Active Publication Date: 2016-03-09
NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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Problems solved by technology

How to apply the micro-arc oxidation coating preparation method to the anti-corrosion treatment of aluminum alloy welded joints of high-speed trains, there are still many technical obstacles

Method used

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  • A corrosion-resistant protection method for micro-arc oxidation of aluminum alloy welded joints in high-speed trains

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Embodiment

[0014] Example: such as figure 1 As shown, the aluminum alloy welding joint part 1 to be treated is placed in the solution reflux tank 2, the anode of the micro-arc oxidation power supply 3 is connected to the aluminum alloy welding joint part 1 through a wire, and the cathode of the micro-arc oxidation power supply 3 is connected to the mobile cathode 4 connection, the mobile cathode 4 is placed in the cathode shield 5, in order to ensure that the mobile cathode 4 is in direct contact with the aluminum alloy welding joint part 1 when moving to cause a short circuit of the micro-arc oxidation power supply 3 and scratches on the workpiece, the lower end of the cathode shield 5 is connected There is an insulating rubber pad 6, which can not only play the role of insulation, but also ensure the flexible contact with the aluminum alloy welding joint part 1, without scratching the workpiece to be processed, and the micro-arc oxidation reaction solution is cooled by the solution cool...

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Abstract

The invention discloses a micro-arc oxidation corrosion-resistant protection method for a high-speed train aluminum alloy welded joint. The method comprises the following steps: an aluminum alloy welded joint to be processed is placed in a solution backflow tank; the aluminum alloy welded joint is connected with an anode of a micro-arc oxidation power supply through a wire; when a cathode of the micro-arc oxidation power supply is connected with a mobile cathode; the mobile cathode is arranged inside a cathode shield cover; the lower part of the cathode shield cover is connected with an insulation rubber gasket; the insulation rubber gasket and the aluminum alloy welded joint are in flexible contact; the cathode shield cover is introduced into a micro-arc oxidation reaction solution; when the micro-arc oxidation power supply supplies power, micro-arc discharge is generated between the mobile cathode and the aluminum alloy welded joint, a ceramic membrane is formed after reaction in a welded joint zone covered under the mobile cathode. Compared to the prior art, the method has simple operations. a layer of metal ceramic oxides is prepared on the surface of the aluminum alloy welded joint by utilization of a micro-arc oxidation method, and the direct contact of the aluminum alloy welded joint and corrosion medium is blocked and the corrosion-resistant purpose is achieved.

Description

technical field [0001] The invention belongs to the technical field of material corrosion protection. More specifically, the present invention relates to a micro-arc oxidation corrosion protection method for aluminum alloy welded joints of high-speed trains. Background technique [0002] Aluminum alloy is the most widely used lightweight high-speed train body structure material. Most of the aluminum alloy car bodies adopt a fully welded structure. According to statistics, the cumulative length of welds in the cab alone is more than 400 meters, and the total length of welds in a CRH380A train is about 2.5 kilometers. It can be seen that the reliability of aluminum alloy welded joints plays a vital role in the safe operation of the entire train. Due to the large shrinkage of aluminum alloys, residual stress and deformation are likely to occur during the welding process, resulting in corrosion and stress corrosion of aluminum alloy welded joints, which are often one of the im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D17/00
Inventor 李春广戴忠晨孟宪伟火巧英郭新王未王红波葛怀普
Owner NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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