CN1234918C - Method for coating ceramics by using plasma electrolytic oxidation and equipment - Google Patents
Method for coating ceramics by using plasma electrolytic oxidation and equipment Download PDFInfo
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Abstract
The present invention relates to a method of plasma electrolytic oxidation of a ceramic coating and equipment thereof. The method comprises the following steps: preparing an alkaline electrolyte containing silicate and aluminate, and adding a proper conductive agent, a proper modifying agent and a proper stabilizing agent; using electrolytic tanks and components to be plated as an electrode pair, changing three-phase four-wire power to electrolysis power of different current waveform assemblies and different current densities to access the electrodes, and causing an electrochemical reaction of the electrolyte; applying positive half-wave current in the beginning, applying alternating current after 5 to 10 minutes, applying the alternating current adding negative half-wave current or pausing to output, initiating the plasma electrolytic oxidation on the surface of metal parts of the alkaline electrolyte by assembling power supply changes, and forming the thickness of the ceramic coating of oxide of 60 to 130 mum and the hardness of the ceramic coating of the oxide of 1400 to 1600Hv. The ceramic coating can also be injected with a solid lubricant to improve wear resistant. Power supply equipment matching the method provides choices of the assembling positive half-wave current, the assembling negative half-wave current and full waveform current. The power supply equipment has the advantages of adjustable current density, simple structure and energy saving.
Description
Technical field
The present invention relates to a kind of method, particularly use the method for plasma electrolysis oxidation at aluminum alloy surface manufacturing ceramic coating.The invention still further relates to a kind of used multi-functional plasma electrolysis oxidation power unit of this method of implementing.
Background technology
Along with the widespread use of aluminium alloy,, press for wear-resistant, the rotproofness that improves aluminum alloy surface, high temperature resistant and electrical insulation capability in many occasions.Adopting plasma electrolysis oxidation (also claiming differential arc oxidation) method, form oxide ceramic coating in aluminum alloy surface, is a kind of modern advanced process for treating surface, is subjected to extensive concern, has begun to enter the practical stage.Present a lot of work is still around improving coating quality, save energy consumption, the aspect such as raising the efficiency and carry out.
U.S. Pat 5616229 discloses the method that a kind of aluminum alloy surface forms ceramic coating.The principal character of this method is to adopt a kind of high-voltage power supply of amendable AC wave shape.Output voltage is at least 700V, and electric current can rise to maximum with interior from zero in 1/4 cycle, drops to it below 40% from maximum again, thinks can prolong the arc-over time like this, obtains best coating result.Another feature of this patent is in the ceramic coating forming process, changes the composition and the concentration of electrolytic solution, forms speed to improve coating.Electrolytic solution is that potassium hydroxide (0.5 grams per liter) is or/and the aqueous solution of tetrasilicic acid sodium (1-11 grams per liter).This patent is introduced, and adopts aforesaid method, can obtain the very high thick ceramic coating of hardness, and coating formation speed reaches more than the 2.5 μ m/min.But this method will constantly change bath composition in the ceramic coating forming process, equipment and operate all more complicated; The power supply of distorted waveform can bring certain interference to electrical network; The bath composition that is adopted can change in the process of working long hours, and coating quality stability is affected.
The method that U.S. Pat 6365028 is introduced, it is characterized in that having adopted stability alkaline electrolyte preferably, its composition is alkali metal hydroxide (1-5 grams per liter), alkalimetal silicate (2-15 grams per liter), alkali metal pyrophosphate (2-20 grams per liter) and superoxide (2-7 grams per liter).Another feature of this method is to adopt the alternating-current of 50-60 hertz, in the initial stage (5-90 second) of technology, by bigger current density (160-180A/dm
2), the spontaneous 3-30A/dm that is reduced to gradually of electric current then
2It is hard ceramic coating 130 μ m densifications, that bonding force is good that 135min can obtain thickness.The shortcoming of this method is: initial current is too big, is difficult in the production handling than the big area part.
Domesticly also carry out this respect work in recent years, obtained certain progress.Chinese patent CN1311354A discloses a kind of method with coating metal surface by micro arc oxidation.This method adopts water glass, potassium hydroxide aqueous solution to make electrolytic solution.Adopt the pulse power of electrical network through the three-phase equilibrium power supply of transformer isolation.Metal parts and oxidation trough be as pair of electrodes, applies positive pulse voltage and the 0-300V negative pulse voltage of 300-800V by the pulse power, makes piece surface realize differential arc oxidation.Super-hard aluminum alloys LC4 adopts positive pulse voltage 600V, negative pulse voltage 140V, current density 10 A/dm
2, 5 hours obtain thickness is the ceramic coating of 100 μ m, the advantage of this method is power supply positive negative pulse stuffing amplitude and width-adjustable, favourable process optimization.Shortcoming is: it is low that ceramic coating forms speed, and energy consumption is big, also has the not high problem of electrolytic solution stability.
Summary of the invention
According to the technical deficiency part of above-mentioned introduction, first purpose of the present invention is a kind of new electrolytic solution of exploitation.This electrolytic solution can satisfy that film quality is good, formation speed is fast, long service life, operating temperature range are wide, not have the requirement of pollution substantially.
Second purpose of the present invention is a kind of new aluminium alloy plasma electrolysis oxidation process of exploitation, and this technology can improve coating and form speed under the prerequisite that guarantees the ceramic coating quality, saves power consumption.
The 3rd purpose of the present invention is a kind of simple ceramic coating swabbing method of exploitation, reduces frictional coefficient, improves work-ing life.
The 4th purpose of the present invention provides achieve the above object simple and convenient, and adjustability is good, electrical network is not had the multi-functional plasma electrolysis oxidation power supply of interferential.
Purpose of the present invention, realize by following technological approaches:
The method of plasma electrolysis oxidation ceramic coating, it comprises following technological process: preparation contains the alkaline electrolyte of silicate and aluminate, and adds an amount of conductive agent, properties-correcting agent and stablizer in this electrolytic solution, and the pH value is 11-13; To contain the electrolyzer of electrolytic solution as a utmost point, the parts that need coating are another utmost point, and the 50Hz power supply that will produce combination of different current waveforms and different current densities inserts electrode, and electrolytic solution generation electrochemistry and plasma chemical are reacted, and electrolyte temperature is 15-60 ℃; Oxidising process begins to import the positive half-wave electric current, and starting current density is 10-25A/dm
2Input AC after 5-10 minute, oxidising process changed additional negative half-wave current of input AC electricity or the electric additional output that suspends of input AC in last 10-30 minute, the spontaneous variation of current density, change metal parts surface spark discharge in the initiation electrolytic solution with the built-up type power supply, produce oxide ceramic coating gradually, current density was reduced to 5-10A/dm when oxidising process stopped
2
The equipment of plasma electrolysis oxidation ceramic coating, it comprises stainless steel electrolytic groove 5 and power supply 1, it is characterized in that producing different current waveform combinations and is made up of feed circuit and pilot circuit with the power unit of different current densities; Feed circuit are made up of switch circuit 24, voltage shift control 25 and many waveforms operating voltage output 26 polyphones that master loop 220V and 380V voltage switching 22, working current select 25 electric capacity combination 23, controllable silicon SCR 1-SCR4 to form successively; Pilot circuit successively by control power supply 27, T1-T8 time set and circulation circuit 28, zero cross fired pulse form and output circuit 29 and 0-110V piezoelectricity and SCR5, SCR6 subloop 30 is contacted forms; Control power supply 27 input terminuss and master loop 220V and 380V voltage switch 22 input terminuss mutually and connect, and switch circuit 24 output terminals of 0-110V voltage and SCR5, SCR6 subloop 30 output terminals and controllable silicon SCR 1-SCR4 composition mutually and connect.
Can obtain 60-130 μ m thickness in oxide treatment 1-2 hour, hardness is the hard ceramic coating of the densification of 1400-1600HV.Ceramic coating is lubricated processing in case of necessity, with the solid lubricant coated component surface that molybdenumdisulphide, Graphite Powder 99 and organic adhesive are formed, with the mechanical friction method solid lubricant is injected the ceramic coating surface micropore, polishes again, reduces frictional coefficient.
Description of drawings
Fig. 1 is an equipment synoptic diagram of the present invention.
Fig. 2 is a plasma electrolysis oxidation power unit structured flowchart.
Fig. 3 is a plasma electrolysis oxidation power work oscillogram.
1 is power unit among the above-mentioned figure, and 2 is lead, and 3 is copper rod, 4 is plastic channel, and 5 is stainless steel tank, and 6 is insulating mat, 7 is electrolytic solution, and 8 for being coated with part by plating, and 9 is ventpipe, 10 are the refrigeration unit, 11 are water coolant turnover pipe, and 12 is air compressor, and 13 is gas barrier, 14 is insulation column, 20 is voltage, current detecting shows that 21 are the input of three-phase four-wire system electric network source, and 22 is that master loop 220V and 380V voltage switch, 23 select 25 electric capacity for working current makes up, 24 switch circuits for controllable silicon SCR 1-SCR4 composition, 25 is voltage shift control, 26 is the output of many waveforms operating voltage, 27 are the control power supply, and 28 is T
1-T
8Time set and circulation circuit, 29 was that " zero " tripping pulse forms and output circuit, 30 is 0-110V voltage and SCR5, SCR6 subloop.
Embodiment
A, bath composition and preparation thereof
In the plasma electrolysis oxidation method, bath composition forms speed, energy expenditure and quality thereof (thickness, hardness, porosity, bonding force etc.) for ceramic coating and has critical effect.
Silicate (comprising potassium silicate and water glass) is best suited for one of electrolyte ingredient of plasma electrolysis oxidation method.It can make electrolytic solution in the temperature and range of current of broad, promotes the aluminum alloy surface passivation, forms the oxide film of silicon oxide-containing.
Aluminate (comprising potassium aluminate and sodium aluminate) also is the ionogen that is fit to the plasma electrolysis oxidation method, and it can reduce the corrosive nature of electrolytic solution, promotes the ceramic coating growth, improves its hardness.
Therefore the electrolytic solution that contains silicate and aluminate obtains to use widely in the plasma electrolysis oxidation method.But there is problem of unstable in this class solution, work or place for some time after because the polymerization of silicate or aluminate hydrolysate causes bath composition and characteristic to change.
Bath composition of the present invention is on the basis of performance silicate, aluminate positive effect, by adding stablizer and other composition, and composition is optimized, and the stability and the coating that improve solution form speed, improve the ceramic coating quality.Above purpose realizes by the following method:
With silicate and aluminate main component as electrolytic solution, make electrolytic solution to the aluminum alloy part surface under electrolytic condition, the intensive passivation is arranged, boosted voltage causes spark discharge rapidly.This is an essential condition to accelerating ceramic coating formation speed.Add alkali metal hydroxide and make conductive agent, can obviously improve the conductive capability and the dispersion force of electrolytic solution, favourable cutting down the consumption of energy improved rete and formed speed.Superoxide is that the properties-correcting agent that improves surface hardness adds as the reinforcement oxidising process.For example hydrogen peroxide decomposites hydroxide radical and oxygen in water, strengthens the reaction of piece surface plasma chemical, improves rete and forms α Al in speed and the rete
2O
3Content.Tungstate can make ceramic coating fine and close more, improves its hardness.In order to improve the stability of electrolytic solution, by adding carboxylate salt and phosphoric acid salt or carboxylate salt and boratory mixture as stablizer, this be because carboxylate salt and phosphoric acid salt or carboxylate salt and boratory mixture to delay silicate, aluminate hydrolyzate polymerization precipitation has tangible effect.
By to multicomponent optimization, its ratio range is: water glass 2-20 grams per liter, and sodium aluminate 1-10 grams per liter, potassium hydroxide 1-5 grams per liter, hydrogen peroxidase 10 .5-5 milliliter/liter or/and sodium wolframate 1-5 grams per liter, carboxylate salt and phosphatic mixture 2-16 grams per liter.PH:11-13, operating temperature range: 15-60 ℃.
During preparation electrolytic solution, water glass adopts water glass, and other composition adopts the chemical analysis pure reagent, adopts distilled water or deionized water.Each components in certain proportion weighing is soluble in water, stirs after the mixing, adds water again to specified volume.
B, plasma electrolysis oxidation method
The plasma electrolysis oxidation method that the present invention relates to, its operation is: oil removing-washing-oxidation-washing-oven dry-lubricated polishing.
Method for oxidation: plasma electrolysis oxidation equipment as shown in Figure 1, the part 8 that will clean through oil removing is installed on the hanger, hangs exporting on the copper rod 3 that an end links with power supply, immerses in the electrolytic solution 7, as an electrode.Stainless steel tank 5 is as another electrode, and its outside maintains in the 15-60 ℃ of scope electrolytic solution with water coolant 11 coolings.With clean pressurized air electrolytic solution is stirred.By predetermined power supply mode energising, initial current density is 10-25 A/dm
2
Power supply mode also plays an important role for the formation speed and the quality of ceramic coating.The invention is characterized in the power supply mode that adopts multiple waveform currents combination: as shown in Figure 3, in initial 5-10 minute of process, input positive half-wave electric current T
1, make piece surface comparatively fast form passive film, voltage raises rapidly, comparatively fast changes the micro-arc discharge state over to.In second, voltage is raised to rapidly about 500V at 30-60, and piece surface forms bright silvery white, intensive mobile spark.Along with coating thickens, resistance increases, and voltage raises gradually, and electric current reduces gradually; After 5-10 minute, voltage rises to about 550V, and power supply mode changes 50 hertz alternating-current T into
3～T
4, carry out oxidation with sun-negative electrode mode, make stable, the growth equably of coating, improve coating quality; Before oxidising process finishes 10-20 minute, power supply mode change that alternating-current 0.9～3.6 second is additional to suspend that to export 0.1～0.9 second be T into
4+ T
5Array mode, or the additional negative half-wave current of alternating-current 0.6～3.6 second was T in 0.1～0.9 second
4+ T
6Array mode, additional negative half-wave current amplitude is the 10-40% of alternating-current amplitude.Hole in the favourable like this reduction coating improves its compactness.In whole oxidising process, after the selected initial current density, just no longer artificially adjust current density, let alone spontaneous decline gradually, so both can reduce schedule of operation, can save electric energy again.Current density is 5-10A/dm during termination
2The required time of whole oxidising process is decided by desired coat-thickness, and this need be determined by experiment.Test shows that oxidation 1-2 hour, coat-thickness was 60-130 μ m.Oxidising process finishes, and powered-down takes out the flushing of part water, oven dry.
For requiring wear resistant parts, can adopt simple and easy swabbing method provided by the invention, piece surface is lubricated processing, reduce its frictional coefficient, this method is: with the even coated ceramic coatingsurface of solid lubricant, then the alternation friction is carried out on the surface, solid lubricant is injected the ceramic coating surface micropore, polish then.Solid lubricant is that molybdenumdisulphide, Graphite Powder 99, organic adhesive are mixed and made into, and three's ratio is (10-20): (10-20): (60-80).
C, electrolytic oxidation power supply
In order to realize above-mentioned power supply mode, the invention provides a kind of multi-functional plasma electrolysis oxidation power supply.This power supply directly utilizes three-phase four-wire system (380V) mains supply, without step-up transformer, and directly passes through conversion, exports 8 sections waveform voltage.Fig. 2 is the functional block diagram of circuit, and Fig. 3 exports positive half-wave voltage for the work wave of output at Tl in the time period, the negative half-wave voltage of T2 output, and T3, T4 output AC wave voltage, T6, T7 are adjustable positive and negative half-wave voltage, T5, T8 are for suspending output.T1-T8 be successively electric, go round and begin again, chain type time of circular flow.Under normal circumstances, synchronization T1-T8 has only one to get electric output.Output time length depends on that the DCD code switch of T1-T8 is set, and regulates the upper and lower displacement of AC wave shape by voltage indication 20 and electric voltage displacement control 25; Positive and negative half-wave current amplitude is adjustable; The cycle of each waveform can be adjustable in 0-0.9 second or 0-1.8 scope second (because of time set has 0.1 second and 0.2 second two kinds of time set is selected).T1, T2 waveform voltage have " constant amplitude " and " the super width of cloth " two kinds of selections, can satisfy different processing requirements.T6, T7 section voltage amplitude can be from (0-110)
Regulate continuously.T3, T4 AC wave shape voltage can carry out positive and negative skew.According to processing requirement, can carry out multiple waveform output and the combination of time, there are hundreds of modes available.
The working current size is to regulate by the various combination of high voltage bearing electrical condenser.Connect 5 groups of electric capacity by 5 buttons, the electric current class that has 32 groups of different sizes can be for selecting for use.Because utilize the electrical condenser current limliting,, bigger power factor compensation effect is arranged for perceptual load.
This power supply adopts the switching switch circuit of high-power silicon controlled rectifier module (SCR1-SCR6) as multistage waveform (T1-T8), and all is operated in " zero " triggering state.Therefore, reliable operation, thermal value are few, noiselessness, saving energy consumption, and be noiseless to electrical network and other electronics.
The power supply maximum output current of being carried is 100A, and maximum voltage (peak is to the peak) is more than 800 volts.
Embodiment 1: the oil shower nozzle.The long 91mm of shower nozzle, external diameter φ 46mm has one to run through endoporus.The endoporus upper part is φ 18 * 19mm, and following is φ 9 * 62mm partly.Require anti-washing away, corrosion-resistant.Former in the GCr15 quenching, the existing plan replaces with LY12 aluminium alloy coated ceramic, only requires endoporus and end face coated ceramic, and outside surface is not wanted coated ceramic.Coated area is 0.87dm
2, adopt following plasma electrolysis oxidation process:
Bath composition: sodium aluminate 4 grams per liters, water glass 2 grams per liters, potassium hydroxide 2 grams per liters, 1 milliliter/liter of hydrogen peroxide, carboxylate salt and boratory mixture 4 grams per liters, the pH value is 12-13, the Working electrolyte temperature is 20-60 ℃.
Pretreatment process: oil removing, washing, oven dry.Protect non-oxidizing peripheral surface with insullac.
Electrolysis oxidation process: input positive half-wave electric current during beginning, current density is 12A/dm
2Input AC electricity after 10 minutes, anode voltage rises to 600V automatically, and cathode voltage is 160V; Current density drops to 9.8A/dm automatically
2, the input AC electricity is that 1.8 seconds additional time-outs are output as combination current oxidation in 0.3 second 20 minutes after 70 minutes, and anode voltage is 616V during end, and cathode voltage is 169V, and current density is 9A/dm
2, electrolysis temperature is 59 ℃.The ceramic metal that is obtained is even canescence, surfacing, and mean thickness is 92 μ m, hardness is 1530HV.
Embodiment 2: the aluminium alloy drift.Drift branch top and the bottom: top is of a size of φ 30 * 100mm, and the bottom is divided into φ 12 * 40mm, requires the lower section wear-resisting, corrosion-resistant, and the former hard chrome plating that carries out is handled, and existing plan is used coated ceramic instead, pollutes to reduce, and improves wear resisting property.Plasma electrolysis oxidation process is as follows:
Bath composition: water glass 8 grams per liters, sodium aluminate 2 grams per liters, potassium hydroxide 2 grams per liters, sodium wolframate 2 grams per liters, carboxylate salt and phosphatic mixture 5 grams per liters, the pH value is 12-13,15-60 ℃ of Working electrolyte temperature.
Oil removing, clean, hang and immerse in the electrolytic solution;
Electrolysis oxidation process: begin to import the positive half-wave electric current, initial current density is 15A/dm
2Oxidation 10 minutes, voltage rises to 570V, changes the input AC CURRENT OXIDATION 60 minutes, and anode voltage rises to 605V, cathode voltage rises to 163V, change 1.8 seconds additional negative half-wave currents of defeated alternating-current and be 0.4 second combination current oxidation 20 minutes, negative half-wave current amplitude size is 30% of an alternating-current, and anode voltage rises to 625V during end, cathode voltage is 171V, the spontaneous 8A/dm that reduces to of current density
2Thicknesses of layers is 95 μ m, and hardness is 1560Hv.Swabbing: with alternation frictional force solid lubricant is injected the ceramic coating surface micropore, polish again, form smooth pitch-black surface.
Embodiment 3, annulus wearing and tearing sample.External diameter φ 40mm, endoporus φ 16mm, width 10mm adopts 6061 aluminium alloys to process.Adopt the electrolytic solution of embodiment 1 to carry out oxidation, initial current density is 13A/dm
2, began to import the positive half-wave electric current 10 minutes, changed alternating-current into 40 minutes, change the input AC electricity again and be 1.8 seconds and additionally suspend the combination current oxidation 10 minutes that is output as 0.3 second.Behind the cleaning, drying, adopt the lubricating method of embodiment 2 to handle, obtain smooth pitch-black ceramic coating.Its performance is as follows: thickness 67 μ m, average hardness 1430HV, wear resisting property: with the hard chrome plating sample to the mill, the ceramic coating abrasion loss is chromed hardened 1/10.Corrosion resistance nature: adopt 300 grams per liter hydrochloric acid+200 grams per liter Cupric Chloride Solutions to soak, it is 75 minutes that the hot spot time appears in ceramic coating, and it is 20 minutes that the hot spot time appears in the hardening oxidation sample.
Claims (10)
1, the method for plasma electrolysis oxidation ceramic coating, it comprises following technological process:
A, preparation contain the alkaline electrolyte of silicate and aluminate, and add an amount of conductive agent, properties-correcting agent and stablizer in this electrolytic solution, and the pH value is 11-13;
B, will contain the electrolyzer of electrolytic solution as a utmost point, the parts that need coating are another utmost point, and the 50Hz power supply that will produce different current waveform combinations and different current densities inserts electrode, make parts surface generation electrochemistry and plasma chemical reaction in the electrolytic solution, electrolyte temperature is 15-60 ℃;
C, oxidising process begin to import the positive half-wave electric current, and starting current density is 10-25A/dm
2Input AC after 5-10 minute, export at additional negative half-wave current of 10-30 minute last input AC of oxidising process or additional time-out of input AC, the spontaneous variation of current density, change metal parts surface spark discharge in the initiation electrolytic solution with the built-up type power supply, produce oxide ceramic coating gradually, current density was reduced to 5-10A/dm when oxidising process stopped
2
2, according to the described method of claim 1, it is characterized in that the silicate in the electrolytic solution comprises potassium silicate and water glass, aluminate comprises potassium aluminate and sodium aluminate, conductive agent is an alkali metal hydroxide, properties-correcting agent is the mixture of superoxide or tungstate or superoxide and tungstate, and stablizer is the mixture of carboxylate salt and phosphoric acid salt or borate and carboxylate salt.
3, method according to claim 1 and 2, the proportioning components that it is characterized in that electrolytic solution is a water glass 2-20 grams per liter, sodium aluminate 1-10 grams per liter, potassium hydroxide 1-5 grams per liter, hydrogen peroxidase 10 .5-5 milliliter/liter or/and sodium wolframate 1-5 grams per liter, carboxylate salt and phosphoric acid salt or carboxylate salt and boratory mixture 2-16 grams per liter.
4, method according to claim 1 and 2 is characterized in that the electrolytic solution component content is: water glass 2 grams per liters, sodium aluminate 4 grams per liters, potassium hydroxide 2 grams per liters, 1 milliliter/liter of hydrogen peroxide, carboxylate salt and boratory mixture 4 grams per liters; Electrolysis oxidation process: begin to import the positive half-wave electric current, current density is 12A/dm
2, input AC electricity after 10 minutes, anode voltage rises to 600V automatically, and cathode voltage is 160V, and current density drops to 9.8A/dm automatically
2, the input AC electricity is additional to suspend the combination current oxidation 20 minutes that is output as 0.3 second in 1.8 seconds after 70 minutes, and anode voltage is 616V during end, and cathode voltage is 169V, and current density is 9A/dm
2, electrolysis temperature is 59 ℃.
5, method according to claim 1 and 2 is characterized in that bath composition content is: water glass 8 grams per liters, sodium aluminate 2 grams per liters, potassium hydroxide 2 grams per liters, sodium wolframate 2 grams per liters, carboxylate salt and phosphatic mixture 5 grams per liters; Electrolysis oxidation process: begin to import the positive half-wave electric current, initial current density is 15A/dm
210 minutes voltage of oxidation rises to 570V, change the input AC electric current, oxidation 60 minutes, anode voltage rises to 605V, cathode voltage rises to 163V, change the input AC electricity and be 1.8 seconds additional negative half-wave currents and be 0.4 second combination current oxidation 20 minutes, negative its amplitude size of half-wave current is 30% of an alternating-current, and anode voltage rises to 625V during end, cathode voltage is 171V, the spontaneous 8A/dm that reduces to of current density
2
6, method according to claim 1 and 2 is characterized in that coating ceramic coating surface does the alternating force friction with solid lubricant, makes solid lubricant inject the ceramic coating surface micropore, and polishes; Solid lubricant is mixed with organic binder bond by molybdenum dioxide, Graphite Powder 99 and forms.
7, a kind of equipment of plasma electrolysis oxidation ceramic coating, it comprises stainless steel electrolytic groove and power supply equipment, it is characterized in that producing different current waveform combinations and is made up of feed circuit and pilot circuit with the power unit of different current densities; Feed circuit are made up of switch circuit (24), voltage shift control (25) and many waveforms operating voltage output (26) polyphone that master loop 220V and 380V voltage switching (22), working current select 25 electric capacity combinations (23), controllable silicon SCR 1-SCR4 to form successively; Pilot circuit is contacted and is formed by control power supply (27), T1-T8 time set and circulation circuit (28), zero cross fired pulse formation and output circuit (29) and 0-110V voltage and SCR5, SCR6 subloop (30) successively; Input terminus and the master loop 220V of control power supply (27) and 380V voltage switching (22) input terminus mutually and connect, switch circuit (24) output terminal of 0-110V voltage and SCR5, SCR6 subloop (30) output terminal and controllable silicon SCR 1-SCR4 composition is mutually and connect.
8, equipment according to claim 7 is characterized in that regulating the upper and lower displacement of AC wave shape by voltage indication (20) and voltage shift control (25); Positive and negative half-wave current amplitude is adjustable; The cycle of each section waveform is adjustable in 0-9 second or 0-1.8 scope second.
9, equipment according to claim 7 is characterized in that the various combination (23) of working current size by high pressure resistant power capacitor, connects 5 groups of electric capacity by 5 buttons, and the electric current class that has 32 groups of different sizes is for selecting for use.
10, equipment according to claim 7 is characterized in that adopting high-power silicon controlled rectifier SCR1-SCR6 (24,30) to make the switching switch circuit of waveform T1-T8, and makes it be operated in " zero " triggering state to cross " zero " tripping pulse circuit (29).
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| CN1936098B (en) * | 2006-09-11 | 2010-05-12 | 中国科学院力学研究所 | Plasma electrolytic oxidation automatic control device and method |
| DE102009001562A1 (en) * | 2009-03-16 | 2010-09-23 | Robert Bosch Gmbh | Starter for an internal combustion engine |
| US9551082B2 (en) * | 2011-02-08 | 2017-01-24 | Cambridge Nanotherm Limited | Insulated metal substrate |
| CN103526256B (en) * | 2013-10-29 | 2016-03-09 | 南京南车浦镇城轨车辆有限责任公司 | A kind of differential arc oxidation corrosion resistant means of defence of bullet train welded joints in aluminium alloy |
| CN103643278B (en) * | 2013-11-21 | 2016-08-24 | 桂林福冈新材料有限公司 | A kind of method of auto parts machinery aluminium differential arc oxidation |
| CN103699161B (en) * | 2013-12-30 | 2015-07-22 | 武汉理工大学 | Regulating device for micro-arc oxidation treatment working currents for light alloy surfaces |
| CN104032349B (en) * | 2014-06-07 | 2017-01-11 | 北京工业大学 | Method for preparing high-purity corundum coating layer on aluminum surface |
| JP2018123847A (en) * | 2017-01-30 | 2018-08-09 | Ｋｙｂ株式会社 | Buffer and manufacturing method for sliding member |
| CN113046809B (en) * | 2019-12-27 | 2022-12-09 | 比亚迪股份有限公司 | Micro-arc oxidation electrolyte, application method thereof and workpiece |
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