CN103526256B - A kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy - Google Patents
A kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy Download PDFInfo
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- CN103526256B CN103526256B CN201310517252.7A CN201310517252A CN103526256B CN 103526256 B CN103526256 B CN 103526256B CN 201310517252 A CN201310517252 A CN 201310517252A CN 103526256 B CN103526256 B CN 103526256B
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Abstract
The invention discloses a kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy, pending welded joints in aluminium alloy is comprised the steps: to be placed in solution return groove, welded joints in aluminium alloy is connected with the anode of mao power source by wire, the negative electrode of mao power source is connected with swap cathode, swap cathode is placed in cathode shield, cathode shield lower end is connected with electro-insulating rubber pad, electro-insulating rubber pad and welded joints in aluminium alloy flexible contact, cathode shield passes into differential arc oxidation reaction soln, after mao power source is powered, micro-arc discharge is produced between swap cathode and welded joints in aluminium alloy, the welding joint region reaction covered below swap cathode generates ceramic membrane.Relative to prior art, the present invention is easy and simple to handle, utilizes the method for differential arc oxidation at welded joints in aluminium alloy surface preparation layer of metal ceramic oxide, hinders welded joints in aluminium alloy to reach anticorrosion object with direct contact of corrosive medium.
Description
Technical field
The invention belongs to protection of materials technical field.More specifically, the present invention relates to a kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy.
Background technology
Aluminium alloy is most widely used lightweight high-speed train body structured material.Aluminum alloy bodywork adopts all-welded structure mostly, and according to statistics, only drivers' cab weld seam is accumulative reaches more than 400 meter long, about a CRH380A type train weld seam total length reaches 2.5 kms.Visible, welded joints in aluminium alloy reliability plays vital effect to whole safe train operation.Because aluminium alloy shrinking percentage is larger, welding process easily produces unrelieved stress and distortion, cause corrosion and stress corrosion one of major reason causing structural failure often of welded joints in aluminium alloy, especially the high-strength aluminum alloy material (as A7N01S-T5 and A6N01S-T5) of some carryings in bullet train, stress corrosion inclination is larger, have impact on safety and reliability during train high-speed cruising greatly.Therefore, be necessary to carry out entirety or local rotproofing to bullet train aluminum alloy welding relay part.
At present, special rotproofing is done to bullet train aluminum alloy bodywork component and welding joint also few.Anodic oxidation can obtain the supercoat of different colours, this technology at home and abroad high-grade construction decoration material field apply to some extent.But the solution of this anodic oxidation protective coating needed in preparation process is normally easily acid, very easily to environment.Coating hardness compared with anodic oxidation prepared by differential arc oxidation is higher, film-substrate cohesion is better, can guarantee the workpiece after processing under arms process floating coat not easily occur to scratch and come off; Later stage dyeing process is carried out to coating, the object of decoration can also be reached; And solution used in differential arc oxidation coating preparation process normally alkalescence is easy, not easily to environment.How differential arc oxidation coating preparation method is applied to the rotproofing of bullet train welded joints in aluminium alloy, also there is many technology barriers.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcome existing for prior art, a kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy is provided, it is easy and simple to handle, at welded joints in aluminium alloy surface preparation layer of metal pottery corrosion protection coating, thus raising welding joint is corrosion-resistant and stress corrosion performance.
The present invention realizes the technical scheme that foregoing invention object takes: a kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy, comprise the steps: 1) pending welded joints in aluminium alloy is placed in solution return groove, welded joints in aluminium alloy is connected with the anode of mao power source by wire, the negative electrode of mao power source is connected with swap cathode, described swap cathode is placed in cathode shield, cathode shield lower end is connected with electro-insulating rubber pad, electro-insulating rubber pad and welded joints in aluminium alloy flexible contact, described cathode shield passes into differential arc oxidation reaction soln, after mao power source is powered, micro-arc discharge is produced between swap cathode and welded joints in aluminium alloy, the welding joint region reaction covered below swap cathode generates ceramic membrane, reacted reaction soln is back to recirculation in solution cooling system through solution return groove and uses.
Further, described differential arc oxidation reaction soln first through solution cooling system cooling after, then by recycle pump circulate constantly extract out pass in cathode shield.
Further, the power-supply system that described mao power source adopts bipolar square wave pulse to export, forward maximum voltage 700V, reverse maximum voltage 300V, power >=20KW.
Further, described swap cathode is thread stainless steel grid electrode structure.Grid electrode shape and size are different with surface shape and different according to the be processed size of part of reality, and network cell size can select the square node of 3-5mm.
Further, described solution return groove is fixed solution return groove or portable solution return groove.
Relative to traditional micro-arc oxidation process, processed workpiece is placed in oxidation trough, electrode transfixion, cathode area is greater than workpiece area usually, Anode-cathode Distance is without particular requirement, pending welded joints in aluminium alloy is placed in solution return groove by the present invention, welded joints in aluminium alloy is connected with the anode of mao power source by wire, the negative electrode of mao power source is connected with swap cathode, described swap cathode is placed in cathode shield, cathode shield lower end is connected with electro-insulating rubber pad, electro-insulating rubber pad and welded joints in aluminium alloy flexible contact, described cathode shield passes into differential arc oxidation reaction soln, after mao power source is powered, micro-arc discharge is produced between swap cathode and welded joints in aluminium alloy, the welding joint region reaction covered below swap cathode generates ceramic membrane, reacted reaction soln is back to recirculation in solution cooling system through solution return groove and uses, solve the process that traditional differential arc oxidation treating processes cannot realize big area workpiece under power-limited power stage condition.In other words, feature of the present invention is to utilize the method for differential arc oxidation at welded joints in aluminium alloy surface preparation layer of metal ceramic oxide, hinders welded joints in aluminium alloy to reach anticorrosion object with direct contact of corrosive medium.Greatly can reduce the possibility of the bullet train structural failure caused due to corrosion and stress corrosion like this, improve the security of bullet train long-time running.
Accompanying drawing explanation
Fig. 1 is bullet train welded joints in aluminium alloy micro arc oxidation treatment device schematic diagram.
In Fig. 1: 1. solution return groove, 2. welded joints in aluminium alloy, 3. mao power source, 4. swap cathode, 5. cathode shield, 6. electro-insulating rubber pad, 7. recycle pump, 8. solution cooling system.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Embodiment: as shown in Figure 1, pending welded joints in aluminium alloy parts 1 are placed on solution return groove 2 upper, the anode of mao power source 3 is connected with welded joints in aluminium alloy parts 1 by wire, the negative electrode of mao power source 3 is connected with swap cathode 4, swap cathode 4 is placed in cathode shield 5, the short circuit of mao power source 3 and the scuffing of workpiece is caused in order to ensure that swap cathode 4 directly contacts with welded joints in aluminium alloy parts 1 when mobile, cathode shield 5 lower end is connected with electro-insulating rubber pad 6, electro-insulating rubber pad 6 can play the effect of insulation, the flexible contact with welded joints in aluminium alloy parts 1 can be ensured again, do not scratch processed part, differential arc oxidation reaction soln is after solution cooling system 8 cools, being circulated constantly to extract out by recycle pump 7 passes in cathode shield 5, after mao power source 3 is powered, micro-arc discharge is produced between swap cathode 4 and welded joints in aluminium alloy parts 1, the welding joint region reaction covered below swap cathode 4 generates ceramic membrane, by the movement of swap cathode 4 along bead direction, realize the corrosion protection coating preparation process of whole welding joint, reacted solution is back to recirculation in solution cooling system 8 through solution return groove 2 and uses.
The present invention is limited to the illustrative embodiments presented in the specification and illustrated in the drawings never in any form.All combinations of the embodiment illustrated and describe are interpreted as clearly to be incorporated within this specification sheets and to be interpreted as clearly and fall within the scope of the present invention.And in the scope of the present invention that such as claims are summarized, a lot of distortion is possible.In addition, any reference marker in claims should be configured to limit the scope of the invention.
Claims (5)
1. the differential arc oxidation corrosion resistant means of defence of a bullet train welded joints in aluminium alloy, it is characterized in that comprising the steps: pending welded joints in aluminium alloy to be placed in solution return groove, welded joints in aluminium alloy is connected with the anode of mao power source by wire, the negative electrode of mao power source is connected with swap cathode, described swap cathode is placed in cathode shield, cathode shield lower end is connected with electro-insulating rubber pad, electro-insulating rubber pad and welded joints in aluminium alloy flexible contact, described cathode shield passes into differential arc oxidation reaction soln, after mao power source is powered, micro-arc discharge is produced between swap cathode and welded joints in aluminium alloy, the welding joint region reaction covered below swap cathode generates ceramic membrane, reacted reaction soln is back to recirculation in solution cooling system through solution return groove and uses.
2. the differential arc oxidation corrosion resistant means of defence of a kind of bullet train welded joints in aluminium alloy according to claim 1, it is characterized in that described differential arc oxidation reaction soln first through solution cooling system cooling after, then by recycle pump circulate constantly extract out pass in cathode shield.
3. the differential arc oxidation corrosion resistant means of defence of a kind of bullet train welded joints in aluminium alloy according to claim 1, it is characterized in that described mao power source adopts the power-supply system of bipolar square wave pulse output, forward maximum voltage 700V, reverse maximum voltage 300V, power >=20KW.
4. the differential arc oxidation corrosion resistant means of defence of a kind of bullet train welded joints in aluminium alloy according to claim 1, is characterized in that described swap cathode is thread stainless steel grid electrode structure.
5. the differential arc oxidation corrosion resistant means of defence of a kind of bullet train welded joints in aluminium alloy according to claim 1, is characterized in that described solution return groove is fixed solution return groove or portable solution return groove.
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| CN201310517252.7A CN103526256B (en) | 2013-10-29 | 2013-10-29 | A kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy |
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| CN104233427A (en) * | 2014-09-30 | 2014-12-24 | 西南交通大学 | Method for improving residual stress of aluminum alloy welding joint through micro-arc oxidation |
| CN109609990B (en) * | 2019-02-18 | 2019-12-10 | 西南交通大学 | Automatic micro-arc oxidation treatment method for surface of large-size workpiece |
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| RU96868U1 (en) * | 2010-04-07 | 2010-08-20 | Государственное образовательное учреждение высшего профессионального образования "МАТИ" - Российский государственный технологический университет имени К.Э. Циолковского | DEVICE FOR MICRO-ARC OXIDATION OF VENTIL METALS AND ALLOYS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4836921B2 (en) * | 2007-10-25 | 2011-12-14 | 株式会社アルバック | Surface treatment method |
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| US6197178B1 (en) * | 1999-04-02 | 2001-03-06 | Microplasmic Corporation | Method for forming ceramic coatings by micro-arc oxidation of reactive metals |
| CN1311354A (en) * | 2001-01-20 | 2001-09-05 | 来永春 | Method and device for coating metal surface by micro arc oxidation |
| CN1323093A (en) * | 2001-04-06 | 2001-11-21 | 来永春 | Bipolar great power pulse power source |
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| EP2045366A1 (en) * | 2006-06-05 | 2009-04-08 | Sibspark, Limited Liability Company | Method for vacuum-compression micro-plasma oxidation and device for carrying out said method |
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| CN101798697A (en) * | 2010-01-27 | 2010-08-11 | 陈跃良 | Local electric field controlled microarc oxidation equipment provided with moving cathode |
| RU96868U1 (en) * | 2010-04-07 | 2010-08-20 | Государственное образовательное учреждение высшего профессионального образования "МАТИ" - Российский государственный технологический университет имени К.Э. Циолковского | DEVICE FOR MICRO-ARC OXIDATION OF VENTIL METALS AND ALLOYS |
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Address after: 210031, 68 North Pearl Road, Taishan Park, Nanjing hi tech Development Zone, Jiangsu, China Patentee after: NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO., LTD. Address before: 210031 Nanjing Pu Pu Road, Jiangsu, No. 208 Patentee before: CSR Nanjing Puzhen Mass Transit Vehicle Co., Ltd |