CN109482990A - The method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining - Google Patents

The method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining Download PDF

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Publication number
CN109482990A
CN109482990A CN201811416749.9A CN201811416749A CN109482990A CN 109482990 A CN109482990 A CN 109482990A CN 201811416749 A CN201811416749 A CN 201811416749A CN 109482990 A CN109482990 A CN 109482990A
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China
Prior art keywords
sodium nitrate
ethylene glycol
aluminium
electrolyte
electrochemical micromachining
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CN201811416749.9A
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Chinese (zh)
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房晓龙
朱嘉澄
曲宁松
曾永彬
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to CN201811416749.9A priority Critical patent/CN109482990A/en
Publication of CN109482990A publication Critical patent/CN109482990A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/08Working media

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

A kind of method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, belongs to technical field of electrolysis processing.The present invention is characterized in that proposing a kind of sodium nitrate ethylene glycol electrolyte and its processing method for aluminium electrochemical micromachining, it is characterised in that: solute is sodium nitrate in above-mentioned sodium nitrate ethylene glycol solution, and solvent is ethylene glycol;Concentration of the above-mentioned sodium nitrate ethylene glycol solution at 20 DEG C is 0.2 ~ 1mol/L;Above-mentioned sodium nitrate ethylene glycol solution is suitable for the electrochemical micromachining of aluminium, and the cost of material is low, and preparation method is easy, and processing quality is good.

Description

The method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining
Technical field
A kind of sodium nitrate ethylene glycol electrolyte and its processing method for aluminium electrochemical micromachining, belong to Electrolyzed Processing skill Art field.
Background technique
Aluminium is a kind of silvery white light metal, and density is small, only 2.7 g/cm3, has good conductive and heating conduction, height Reflexive and oxidative resistance and be widely used in micro parts.In the field MEMS, aluminium is processed to core model of various shapes, For making cavity shape complexity, the high micro parts of required precision such as have the Feed Horn of corrugated inner surface structure, also Waveguide class device etc. for THz wave transmission.
The processing method of aluminum current mainly includes plastic processing, machining, electrical discharge machining, high energy beam machining etc.. Plastic processing is mainly used to process heavy parts, is not suitable for carrying out microfabrication.When micro-cutting processes aluminium, there is workpiece tables The disadvantages of face easily scratches, and is easily deformed after processing, generates burr.India scholar R.K.Arya etc., which is proposed, utilizes Powder-mixed EDM The method of processing processes aluminum matrix composite, and after being mixed into graphite particle in emulsion, material removing rate is reduced, workpiece table Face quality is improved, but inevitably generates re cast layer in workpiece surface.Louisiana Polytechnics, the U.S. Adams etc. processes microflute in revolving body aluminum alloy surface using ion beam, and the width of mini longitudinal channels processed is 13.2M, groove depth 4M, but there are apparent burr phenomenas for workpiece surface.
Electrochemical micromachining technology is as a kind of electrical-chemistry method technology, the basic principle is that being dissolved using Anodic To remove material.Cathode tool is not contacted with anode workpiece in electrochemical micromachining, does not generate cutting heat, without processing hardening And heat affected area, and cathode tool is substantially lossless.Therefore, electrochemical micromachining technology is usually used in processing various difficult cutting materials Material and thin-walled, easily-deformable workpiece.
Electrolyte is most important component part in electrochemical micromachining system, it to the electrochemical reaction of anode material, Rate of dissolution and machining accuracy play decisive role.Meanwhile electrolyte can also take away the bubble of machining area generation, metal Cation, insoluble product and Joule heat etc..Since the chemical property of aluminium is more active, the Electrolyzed Processing of aluminium often selects passivation type Electrolyte such as sodium nitrate aqueous solution.But aluminium, due to the effect of oxygen/water molecule, is easy to produce passivating film in water based electrolyte. In process, the fault location of passivating film can generate spot corrosion first, with the continuous destruction and formation of passivating film, so that processing Difficulty, processing quality are deteriorated.In addition, processing product of the aluminium in water based electrolyte is flocculent undissolved substance, minute yardstick is easily blocked Gap is processed, processing stability is influenced.
A kind of sodium nitrate ethylene glycol electrolyte proposed by the present invention and its processing method for aluminium electrochemical micromachining, solution Having determined, processing efficiency is low in traditional water based electrolyte for aluminium, and surface quality is poor, the unstable problem of process.It is of the present invention Sodium nitrate ethylene glycol electrolyte prepare easy, at low cost, machining accuracy is high, and surface quality is good.
Summary of the invention
Present invention aims at propose a kind of method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, solution Certainly aluminium machined surface quality in traditional water based electrolyte is poor, the low problem of machining accuracy.
A kind of method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, it is characterised in that: above-mentioned sodium nitrate Solute is sodium nitrate in ethylene glycol electrolyte, and solvent is ethylene glycol;Concentration of the above-mentioned sodium nitrate ethylene glycol electrolyte at 20 DEG C For 0.2 ~ 1mol/L;Machining voltage is 6V ~ 12V.
Electrochemical micromachining technology does not generate cutting heat without cutting force, and it is variable to efficiently solve aluminium in tradition machinery processing Shape has residual stress, the poor problem of machined surface quality.Aluminium is easy to produce passivating film in water based electrolyte, so that processing Difficulty, processing quality are deteriorated.In addition, processing product of the aluminium in water based electrolyte is flocculent undissolved substance, minute yardstick is easily blocked Gap is processed, processing stability is influenced.And sodium nitrate ethylene glycol electrolyte of the present invention, since hydrone content is extremely low, The generation of oxygen in process is avoided, the passivating film of aluminium surface is difficult to regenerate again after being destroyed, ensure that processed The stability of journey.Meanwhile processing product of the aluminium in sodium nitrate ethylene glycol electrolyte be it is soluble, processing district will not be blocked Domain ensure that the stability of processing.In general, concentration of electrolyte is higher, voltage is higher, then the efficiency of Electrolyzed Processing is higher, But excessively high concentration of electrolyte and machining voltage will affect machining accuracy, and generate dispersion corrosion.In general, using higher Frequency, lower duty ratio is conducive to the exclusion of machining area product, the update of electrolyte, so that processing effect is more preferable.
The method that the sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, it is characterised in that: electrolyte is dense Spend 1mol/L, machining voltage 8V.
The method that the sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, it is characterised in that: frequency 100 ~ 300KHz, duty ratio 15 ~ 30%, 0.1 ~ 0.2 μm/s of process velocity.In general, using higher frequency (being greater than 100KHz), Lower duty ratio (less than 30%) is conducive to the exclusion of machining area product, the update of electrolyte, so that processing effect is more preferable.
The method that the sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, it is characterised in that: frequency 200KHz, duty ratio 20%, 0.2 μm/s of process velocity.
Detailed description of the invention
Fig. 1 is the schematic diagram of aluminium electrochemical micromachining;
Fig. 2 is the scanning electron microscope (SEM) photograph of embodiment 1;
Fig. 3 is the scanning electron microscope (SEM) photograph of embodiment 2;
Fig. 4 is the scanning electron microscope (SEM) photograph of embodiment 3;
Fig. 5 is the scanning electron microscope (SEM) photograph of embodiment 4;
Fig. 6 is the scanning electron microscope (SEM) photograph of embodiment 5;
Its label is entitled: 1, electrolyte;2, screw electrode;3, the pulse power;4, aluminium workpiece;5, ethylene glycol;6, sodium nitrate;7, Deionized water.
Specific embodiment
Electrolyte 1 is poured into electrolytic bath first, submerges screw electrode 2 and aluminium workpiece 4.
The pulse power 3 is connect into positive aluminium workpiece 4, cathode connects screw electrode 2, and make pulse power supply 3 utilizes Anodic Solution principle processes aluminium workpiece 4 by the numerical control campaign of screw electrode 2, can process slit structure.The pulse power 3 output voltage range is 5 ~ 20V, duty ratio 10 ~ 80%, frequency 1KHz ~ 500KHz.Optional 0.1 μm/s ~ 2 of process velocity range μm/s。
Technical solution of the present invention and its advantages are described further below with reference to embodiment.Nitre is used by comparison Acid sodium aqueous solution and sodium nitrate ethylene glycol solution carry out the effect of aluminium electrochemical micromachining, illustrate sodium nitrate ethylene glycol of the invention Electrolyte can solve aluminium, and processing efficiency is low in traditional water based electrolyte, and surface quality is poor, the unstable problem of process.
Embodiment 1
15g sodium nitrate is added in deionized water under room temperature, is configured to 1L solution, the sodium nitrate 6 is to analyze pure, deionized water 7 be industry standard reagent.Pulse power anode is connect into aluminium workpiece, cathode connects screw electrode, using 8V voltage, 10% duty ratio, 10KHz frequency, 0.2 μm/s of process velocity.The slit that processes is deposited bright around machining area as shown in Fig. 2, slit pattern is poor Aobvious dispersion corrosion.
Embodiment 2
1mol sodium nitrate is added in ethylene glycol under room temperature, is configured to 1L solution, the sodium nitrate 6 is to analyze pure, deionized water 5 It is pure to analyze.Pulse power anode is connect into aluminium workpiece, cathode connects screw electrode, using 6V voltage, 20% duty ratio, 200KHz frequency Rate, 0.1 μm/s of process velocity.The slit that processes as shown in figure 3, without dispersion corrosion around machining area, but due to voltage compared with Small, permitted feed speed also very little, processing efficiency is lower, and will appear short circuit phenomenon once in a while in processing.
Embodiment 3
1mol sodium nitrate is added in ethylene glycol under room temperature, is configured to 1L solution, the sodium nitrate 6 is to analyze pure, deionized water 5 It is pure to analyze.Pulse power anode is connect into aluminium workpiece, cathode connects screw electrode, using 8V voltage, 20% duty ratio, 200KHz frequency Rate, 0.2 μm/s of process velocity.The slit that processes is as shown in figure 4, the slit pattern processed is good, base around machining area , without dispersion corrosion, surface quality is good for this, and process is stablized, and slit width consistency is good.
Embodiment 4
1mol sodium nitrate is added in ethylene glycol under room temperature, is configured to 1L solution, the sodium nitrate 6 is to analyze pure, deionized water 5 It is pure to analyze.Pulse power anode is connect into aluminium workpiece, cathode connects screw electrode, using 12V voltage, 20% duty ratio, 200KHz frequency Rate, 0.2 μm/s of process velocity.The slit that processes is as shown in figure 5, the slit width consistency processed is poor, and with electricity Pressure increases, and will appear point corrosion around machining area, and surface quality reduces.
Embodiment 5
0.2mol sodium nitrate is added in ethylene glycol under room temperature, is configured to 1L solution, the sodium nitrate 6 is to analyze pure, deionization Water 5 is that analysis is pure.Pulse power anode is connect into aluminium workpiece, cathode connects screw electrode, using 8V voltage, 20% duty ratio, 200KHz Frequency, 0.2 μm/s of process velocity.The slit processed is as shown in fig. 6, substantially without dispersion corrosion, surface matter around machining area It measures, and process is basicly stable, slit width consistency is preferable.

Claims (4)

1. a kind of method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining, it is characterised in that:
Solute is sodium nitrate in above-mentioned sodium nitrate ethylene glycol electrolyte, and solvent is ethylene glycol;
Concentration of the above-mentioned sodium nitrate ethylene glycol electrolyte at 20 DEG C is 0.2 ~ 1mol/L;
Machining voltage is 6V ~ 12V.
2. the method that sodium nitrate ethylene glycol electrolyte according to claim 1 is used for aluminium electrochemical micromachining, feature exist In:
Concentration of electrolyte 1mol/L, machining voltage 8V.
3. the method that sodium nitrate ethylene glycol electrolyte according to claim 1 is used for aluminium electrochemical micromachining, feature exist In:
100 ~ 300KHz of frequency, duty ratio 15 ~ 30%, 0.1 ~ 0.2 μm/s of process velocity.
4. the method that sodium nitrate ethylene glycol electrolyte according to claim 3 is used for aluminium electrochemical micromachining, feature exist In:
Frequency 200KHz, duty ratio 20%, 0.2 μm/s of process velocity.
CN201811416749.9A 2018-11-26 2018-11-26 The method that sodium nitrate ethylene glycol electrolyte is used for aluminium electrochemical micromachining Pending CN109482990A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110560806A (en) * 2019-08-20 2019-12-13 南京航空航天大学 Method for finely electrolyzing and processing titanium and aluminum by sodium chloride and ethylene glycol electrolyte
CN111014854A (en) * 2019-11-15 2020-04-17 鞍钢集团矿业有限公司 Electrolyte for titanium alloy micro-electrochemical machining and preparation method thereof
CN111545850A (en) * 2020-05-11 2020-08-18 南京航空航天大学 Ethylene glycol based solution electrolysis electric spark composite wire cutting processing method
CN112008166A (en) * 2019-05-29 2020-12-01 天津大学 Electrolyte for nickel-titanium memory alloy micro-electrochemical machining

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CN102699454A (en) * 2012-05-07 2012-10-03 天津大学 Electrolytic machining system and method for foamed aluminium buffering and energy adsorbing material
CN103668380A (en) * 2013-12-17 2014-03-26 清华大学 Double-membrane side wall insulation method of electrode for electrochemical machining
CN107999908A (en) * 2018-01-09 2018-05-08 河南理工大学 A kind of production method of micro-pit array

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112008166A (en) * 2019-05-29 2020-12-01 天津大学 Electrolyte for nickel-titanium memory alloy micro-electrochemical machining
CN110560806A (en) * 2019-08-20 2019-12-13 南京航空航天大学 Method for finely electrolyzing and processing titanium and aluminum by sodium chloride and ethylene glycol electrolyte
CN111014854A (en) * 2019-11-15 2020-04-17 鞍钢集团矿业有限公司 Electrolyte for titanium alloy micro-electrochemical machining and preparation method thereof
CN111545850A (en) * 2020-05-11 2020-08-18 南京航空航天大学 Ethylene glycol based solution electrolysis electric spark composite wire cutting processing method
CN111545850B (en) * 2020-05-11 2021-06-08 南京航空航天大学 Ethylene glycol based solution electrolysis electric spark composite wire cutting processing method

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