CN100454742C - Large capacity titanium alloy pulse micro arc anode oxidation dynamic control power source - Google Patents
Large capacity titanium alloy pulse micro arc anode oxidation dynamic control power source Download PDFInfo
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- CN100454742C CN100454742C CNB200410050471XA CN200410050471A CN100454742C CN 100454742 C CN100454742 C CN 100454742C CN B200410050471X A CNB200410050471X A CN B200410050471XA CN 200410050471 A CN200410050471 A CN 200410050471A CN 100454742 C CN100454742 C CN 100454742C
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Abstract
The present invention relates to a large-capacity titanium alloy pulse micro arc anode oxidation dynamic control power source which is composed of a hardware part and a control program part, wherein the hardware uses a single-board computer as a core. The control on parameter ranges for technical requirements and a dynamic state are realized by the changes of a transformer and the output of multiple paths through a control circuit, wherein the control circuit is provided with a single-board computer main circuit, a feedback circuit, an impulse control circuit and a protective circuit; the parameter ranges contain initial voltage, final work voltage, speed of automatic voltage increase, current ranges of technical processes, rated permanent current value, pulse duration, pulsed tracking frequency, duty ratio, negative going pulses, tail end voltage, current degradation speed, working temperature of an electrolytic tank, etc. The present invention which uses the single-board computer as the core has the advantages of flexible control, high precision, and stable and reliable circuit; the present invention can realize automatic matching control with multiparameter and wide range of dynamic coordination in large-capacity titanium alloy pulse micro arc anode oxidation dynamic detection processes. The present invention solves the problem that titanium alloy oxidation films are difficultly thickened.
Description
Technical field
The present invention relates to a kind of big capacity and dynamically control power supply, be particularly suitable for dynamically controlling use in titanium alloy pulse micro-arc anodic oxidation production process.
Background technology
Titanium alloy pulse micro-arc anodic oxidation technology is at present a kind of complicated electrochemical surface treatment process, device power supply (DPS) to treatment process requires very high, at present titanium alloy being handled the equipment that is adopted is the Switching Power Supply that adopts the plug-in control board, when making AC-DC, the ripple rate of power supply requires below 1%, guarantee the constant product quality of producing, oxide thickness, the color uniformity, the requirement of this power supply, present Switching Power Supply is difficult to reach, finish parameter related in the technical process accurately for the titanium alloy anode oxidation science initialization voltage is arranged, final operating voltage, specified ceiling voltage, the rate of pressure rise, the voltage range of technical process, specified constant current value, pulse duration, the pulse tracking frequency, duty ratio, the negative-going pulse value, the full-automatic dynamically control of multi-parameters such as latter end electric current and voltage decrease speed and electric tank working temperature, consult all related datas at present, all do not found the power supply of relevant titanium alloy pulse micro-arc anodic oxidation production process.
Summary of the invention
For solving dynamic power supplies control of process parameters in the titanium alloy pulse micro-arc anodic oxidation production process, purpose of the present invention provides a kind of big capacity titanium alloy pulse micro-arc anodic oxidation dynamically to control power supply, the method of utilizing single board computer and control power supply is to realize in the titanium alloy pulse micro-arc anodic oxidation production process the wide region dynamic coordinate of a plurality of power parameters, coupling control automatically, make that weight of equipment is light, volume is little, to satisfy the dynamic control power supply of specification requirement.
Technical scheme of the present invention is achieved in that the big capacity titanium alloy of the present invention pulse micro-arc anodic oxidation dynamically controls power supply and include hardware and control method two parts and form.
Hardware is made up of alternating current circuit and correspondent control circuits, the interchange main circuit is an ac input circuit, control circuit comprises single board computer circuit, feedback circuit, control impuls circuit, protective circuit and display circuit, its connection is: alternating current circuit is powered by electrical source of power, three-phase alternating-current supply is connected to the step-down of three-phase main transformer through fuse, A.C. contactor, secondary is that two prescriptions are to opposite three-phase bridge lock stream rectification, ac input circuit wherein, AC power is connected to control circuit and makes impulsive synchronization voltage after phase shifting transformer, three-phase TC2 step-down; Through power transformer, after the single-phase TC1 step-down, to deliver to control circuit for two groups and make the control power supply through rectifying and voltage-stabilizing, another group is connected to the display screen power supply; Voltage Feedback; the secondary output of Current Feedback Control circuit and transformer T; after step-down, be connected to voltage stabilizing circuit (500; 600) and voltage protection circuit (FL) join; the control impuls circuit is voltage stabilizing and a current stabilization operating state of setting positive or negative pulse by display screen; the paired pulses frequency; pulse duty factor; set-point and feedback signal pressure limiting; the current limliting set-point calculates; generate the high-frequency impulse row of phase change thereupon changing; be connected to controllable silicon driver part and high-frequency pulse transformer through single board computer; the conducting of control plus or minus thyristor; be six pairs No. 12 impulse circuits; thereby produce and setting operating state correspondent voltage electric current, (as shown in Figure 1).
Protective circuit has overvoltage protection, overcurrent protection, when voltage, electric current surpass set point, and the protective circuit action, locking pulse, direct current output as a result reduces to zero, and overtemperature protection and open-phase protection are not always the case and carry out.
The control circuit structure is that single board computer output is input to the controllable silicon drive circuit input through interface circuit, specifically be input to the control input end of drive circuit JK004, the signal of input is the size of the frequency and the angle of flow, drive through the two poles of the earth triode, directly control silicon controlled control utmost point input by transformer, the forward and reverse drive circuit 12 tunnel that is six pairs of controllable silicon outputs is (as Fig. 3～7, shown in 9), wherein overvoltage crowbar is protective circuit control end (502), normal voltage input VBZ and voltage input end 500 and 600 are exported through voltage comparator, export by IC14C at last, be directly inputted to the controllable silicon drive circuit control end, 14 jiaos of IC1～IC6, the accurate voltage output of another road sign simultaneously is connected to 12 jiaos (as shown in Figure 8) of IC1～IC6;
Overcurrent protection identical with overvoltage protection (as shown in figure 10), voltage controling end and normalized current output output to 14 jiaos of IC1～IC6 through comparator, and frequency is outputed to 3 jiaos (as shown in figure 10) of drive control component by parts.
The big capacity of the present invention is dynamically controlled power supply in the dynamic production control process of titanium alloy pulse micro-arc anodic oxidation, and the setting of all parameters and debugging all realize by computer-controlled method, are illustrated below in conjunction with program flow diagram.
Computer control method comprises the following steps:
1, initialization, this method can automatic checkout equipment various functions, show the safe array of various parameters, the line correlation of going forward side by side prompting;
2, input parameter, the low temperature pulse micro-arc anodic oxidation of titanium alloy, because the characteristics of different one-tenth mem stages make whole film forming procedure be divided into three different control stages, all parameters of three phases are all once imported at this and are finished;
3, the three phases of film forming procedure: be followed successively by T1 section, T2 section, T3 section.
Wherein: the T1 section
Because titanium alloy is the alloy that the active metal forms, the anode film technique requires high, and the micro-arc anodic oxidation film of therefore initial (T1 section) generates under big electric current fast, and thickness is 0.5～1.0 μ m;
The T1 section is set following parameters:
Time control: the micro-arc anodic oxidation phase I of titanium generally has only 0.5～1.5min;
Stop voltage scope: force operating voltage sharply is increased to 80～100 volts from zero in 0.5～1.5min system;
Current range: should want as much as possible greatly in this stage anodic current density, conference reaches 10～15A/dm
2, according to the gross area of different part kinds and dress odd part, system extrapolates corresponding total current range automatically;
Current-limiting protection: in whole micro-arc anodic oxidation process, the electric current maximum of phase I, if calculate improper or cause current peak to reach for some reason or when being about to reach the maximum current that equipment allows, software systems will be carried out the current limliting adjustment automatically, current value be adjusted to the lower limit of the current range of permission;
Pulse duration: the characteristics of the pulse power are when alternating current changes direct current into, power supply is an intermittent power supply, the waveform of native system output is the square ripple, at anodised pulse duration phase I t1 is 0.8～0.9 second, be 0.01～0.2 second break time, and tracking frequency is 0.25～2.95HZ.
Tracking frequency: the anodization phase I, tracking frequency is 1.25～2.95HZ;
Warning system: according to different dangerous key elements warning system is arranged all in the different time periods, when equipment, parameter, circuit or tank liquor temperature occur when unusual, system will report to the police and cut off the power supply automatically;
Temperature control system: titanium alloy micro-arc anodic oxidation process is an exothermic process, carrying out along with reaction, the temperature of tank liquor can constantly increase, for the anode oxide film that makes generation has certain rigidity to improve its resistance to wear, whole anode oxidation process will carry out under the constant temperature of lower (10～+ 10 ℃), so system will constantly lower the temperature.One of temperature sensor links to each other with thermometer in the tank liquor, the control of the then controlled system of the other end, and when temperature raises when departing from set point, thermometer is delivered in the control system by transducer, triggers control system and gives an order, and starts refrigerating system and starts working.
The T2 section:
The micro-arc anodic oxidation of titanium alloy mainly is in second time period, in this time period, the parameter of most technological parameter and anodic oxidation phase I is different, because the anode oxide film that titanium alloy generates under high voltage is a dielectric film, when film thickness reaches 0.5 μ m when above, the resistance value that records oxide-film at 500V reaches 10
5Ω is an insulating barrier, if want oxide-film to thicken, must oxide-film be thickened anode oxide film puncture, the conducting that had before generated by boosted voltage, by continuous boosted voltage, the continuous current density of keeping by part that punctures.
The T2 section is set following parameters:
Time control: the length of micro-arc anodic oxidation second stage time, depend on of the requirement of Element Design drawing to thickness, generally speaking, oxide thickness is at 2-25 μ m, the time 35-120min of this period;
Pulse duration: the waveform of native system output is the square ripple.Removing forward wave is 0.2-0.6 second at anodised second stage pulse duration t2; The duration of negative wave is 0.1-0.2 second;
Tracking frequency: the anodization second stage, system is being 0.8-1.2HZ with anodization pulse tracking FREQUENCY CONTROL;
Warning system: when equipment, parameter, circuit or tank liquor temperature occur when unusual, system will report to the police and cut off the power supply automatically;
Temperature control system: in anode oxidation process, system will constantly lower the temperature, and controls anode oxidation process automatically and carries out under-10～+ 10 ℃ constant temperature, and one of temperature sensor links to each other with thermometer in the tank liquor, and the other end is controlled by system then;
The forward constant current+: constant in this stage pulse forward anodic current density, keep the current density of anode at 1.5-2A/dm by the voltage of continuous living high capacity
2, the gross area of root a tree name dress odd part accurately calculates total electric current;
The negative sense constant current-: this stage pulse negative sense anodic current density is also constant, at 0.1-0.3A/dm
2The gross area of root a tree name dress odd part accurately calculates total electric current;
Automatically the guarantor's constant current of boosting: in order to keep the conductivity of workpiece, system's anodised voltage that will constantly raise, the constant current of whole to keep (second stage) process;
Voltage-limiting protection: in the micro-arc anodic oxidation process of second stage, in order to guarantee the constant of electric current, voltage is in continuous rising.When some reason causes voltage peak to reach or be about to reach the maximum voltage of equipment permission, software systems will be carried out the pressure limiting adjustment automatically, magnitude of voltage be adjusted in the scope of permission.
The T3 section:
The 3rd time period of the micro-arc anodic oxidation of titanium alloy, parameter in the technological parameter of this time period and preceding two time periods is also different, because titanium alloy anodic oxide film is a porous, when oxide thickness reaches the drawing regulation, can not cut off the power supply immediately stops, and will carry out sealing of hole processing-T3 section.
The T3 section is set following parameters:
Time control: the time that micro-arc anodic oxidation phase III-sealing of hole is handled, depend on and of the requirement of Element Design drawing to thickness. this process control was at 4～8 minutes usually;
Pulse duration: the waveform of native system output is the square ripple, and forward wave is in the anodised phase III, and pulse duration t3 is 0.2～0.6 second; Similar to first period, there is not negative wave;
Warning system: when equipment, parameter, circuit or tank liquor temperature occur when unusual, system will report to the police and cut off the power supply automatically;
Temperature control system: in anode oxidation process, system will constantly lower the temperature, and controls anode oxidation process automatically and carries out under-10～+ 10 ℃ constant temperature, and one of temperature sensor links to each other with thermometer in the tank liquor, and the other end is controlled by system then;
Constant-pressure drop stream: system will stop to boost in this period, and under higher constant voltage, 4～8 fens master slave systems are forced electric current electricity forward constant current+reduce to zero;
Step-down is made zero: after electric current made zero, system reduced to zero with voltage automatically by 100～300 volts;
Outage prompting: (the The whole control method is about to be finished) system can send special sound when the pulse micro-arc anodic oxidation finished, and the prompting anodic oxidation finishes, and can take out part from electrolysis tank.
Advantage of the present invention: circuit design is reasonable, with the single board computer is core, control flexibly, the precision height, circuit is reliable and stable, for having realized multi-parameter in the big capacity titanium alloy pulse micro-arc anodic oxidation detection of dynamic process, the wide region dynamic coordinate, automatically coupling control has solved the titanium alloy oxide-film and has thickened difficult problem, has very big economic benefit.
Description of drawings
Fig. 1 is an external circuit power electrical connection graph of the present invention;
Fig. 2 is circuit phase place phase sequence control of the present invention, positive-negative power circuit theory diagrams;
Fig. 3～7,9 are the present invention's 12 road forward and reverse triggering SCR control electrical schematic diagrams;
Fig. 8 is an overvoltage protection electrical schematic diagram of the present invention;
Figure 10 is an overcurrent protection electrical schematic diagram of the present invention;
Figure 11 is a control program flow chart of the present invention;
Figure 12 is single board computer control electrical schematic diagram of the present invention.
Embodiment
Detailed structure of the present invention and operation principle are described in detail in conjunction with the accompanying drawings.
Hardware components of the present invention is made up of inside and outside circuit two parts, wherein machine intimate power supply :-15V ,-the 5V power supply: through TC1 transformer secondary output 001,002 output-15V after voltage stabilizing 7915 filtering are sent in B2 drag flow C9 filtering.Again through 7905 regulator block C11 filtering output-5V.
+ 24V ,+15V ,+the 5V power supply: through TC1 transformer number of times 003,004, again through B1 drag flow C6 filtering 7824 regulator block C7 filtering output+24V.+ 24V is through 7815 regulator block C8 filtering output+15V, and+15V exports+5V through 7805 regulator blocks.
The display screen DC power supply: by D7, D8 all-wave drag flow, C12 filtering, being regulated by P1 through the IC10 regulator block again can the output display screen required voltage behind TC1 transformer secondary output 005,006,007.
Phase sequence detects and protection
Guarantee necessarily that for any one equipment phase sequence meets the requirements, if phase sequence not to or phase shortage must cut off power supply circuits, and 50 all frequency of supplies are required: 47HZ＜f＜53HZ.
Circuit of testing the phase sequence be connected on 012,013,014 behind drag flow D1, D2, D3 by resistance R 1-R6 dividing potential drop, drive triode T1, T2, T3 respectively, again through Schmidt trigger circuit IC1A, IC1B, IC1C with its conformality, IC2 (4027) is just along the two JK flip-flop that trigger, and phase sequence is detected by IC2 and IC1D.When IC1A/3 is by low uprising when 012 phase voltage rises to 146V, the result makes IC2 through C1 clear " 0 ", 012 more than 146V, the 013 phase voltage 146V that also rises, IC1B/4 output also uprises, and it makes the J of IC2B uprise on the one hand, provides trigger impulse for IC2A/3 (CLK) on the other hand, IC2:A/1 is uprised, IC1C/10 uprises, and makes IC2B/11 obtain trigger impulse, and IC2B/15 exports high level, this variation is cyclic variation, illustrate that phase sequence is right, IC1D/11 is output as low level, triggers IC3 and makes the adhesive of RL1 relay, the RL1 relay contact inserts DC power-supply circuit input, (as shown in Figure 2).
If phase sequence is not right, can exchange B, C mutually, can check major loop as phase shortage.
Protective circuit:
Overvoltage protection: overvoltage protection obtains from the output voltage dividing potential drop; (502,600) will be obtained dividing potential drop to be converted to-15V-+15V voltage is as standard, with output voltage in dividing potential drop after ratio convert voltage Vout1 to; if Vout1＞Vout3; Vout3 is protection voltage, and IC7A/1 output LOW voltage then is behind IC14A, IC14C; the IC14C/10 output low level; block IC1-IC6/14, IC1-IC6 is for triggering controlled silicon chip, and the pulse of controllable silicon triggerless quits work.Make direct voltage be output as " 0 ".
Filter protection: filter protection and take a sample from major loop resistance FL; its current value is converted to voltage Vout4, and voltage range is-15V-+15V that protective current is defined as Ib; also it is converted to-the 15V-+15V scope in; voltage Vout5, Vout4, Vout5 compare by comparator IC15A (LM324) then, if during Vout4＞Vout5; the IC15A/1 output low level; deliver to IC14/2, make IC14C/10 step-down level block the IC1-IC6 trigger impulse at last, make direct current be output as " 0 ".
The controllable silicon overtemperature prote: temperature relay is attached on the controllable silicon fin, and for a certain reason during overtemperature, temperature relay touches and closes closedly, and K1 relay admittance disconnects major loop.
Set point: to output voltage, electric current, output waveform, duty ratio, amplitude pulse frequency etc. are set.
At first set point is converted to-15V-+15V voltage, delivers to then and trigger on the corresponding pin of controlled silicon chip.
Set as voltage, set point Vbz is converted to Vbz-15V-+15V voltage, and Vout2 need carry out the ratio debugging repeatedly, delivers to IC1-IC6/12.
The setting of frequency, set point is f, and f is changed by f/v, (15V+15V) send IC1-IC6/3 to the Vout6 of output f correspondence.Certainly this value obtains through debugging repeatedly.
Lock-out pulse: the single controllable silicon of lock-out pulse is only used one, and three-phase voltage was tied TC2 transformer output 011,010 and delivered to IC1-IC6/8,7.
To the wherein explanation of KJ004 device.
With IC1 is example, this integrated circuit forms circuit, offset voltage, phase-shifting voltages and sawtooth voltage by sync detection circuit, sawtooth and comprehensively compares, amplifying circuit and power amplifier are formed, and the sawtooth waveforms slope depends on charging current and the integrating capacitor C3 numerical value that outer meeting resistance R16, RW2 flow out.For different phase shift controlling voltage Vy, as long as change the ratio of power resistance R 12, R13, regulate corresponding offset voltage Vp, transfer sawtooth waveforms slope potentiometer RW2 can make different phase shift controlling voltages obtain a just phase shift range simultaneously, circuits for triggering are anodal sexual type, be that phase-shifting voltages increases, the angle of flow is bigger.R11, C4 form differential circuit, change R11, C4 and can obtain distinct pulse widths output.
Controllable silicon triggers: by main circuit six forwards, six reverse controllable silicons are arranged.The present invention is an example with V1, V7, KJ04/1, KJ04/15 phase difference output are 180 ° of pulses, drive T1, DT1 with KJ04/1 and trigger forward controllable silicon V1 during in the adhesive of RL2 relay through driving transformer, drive T2, DT2 with KJ04/15 equally, through driving transformer RL5 adhesive, trigger reverse controllable silicon V7.
V1 and V7 are controlled by relay R L2, RL5, and RL2, RL5 depend on malleation output or negative pressure output.
K1, K2, K3, K4, K5, K6 are forward controllable silicon anode;
G1, G2, G3, G4, G5, G6 are the forward SCR control utmost point;
K7, K8, K9, K10, K11, K12 are reverse controllable silicon anode;
G7, G8, G9, G10, G11, G12 are the reverse SCR control utmost point.
Forward controllable silicon, reverse SCR control:
Vout2 compares through high-tension circuit IC11
Vout2＞0, IC11/7 is high level T6 conducting, relay R L2, RL3, RL4 adhesive, contact 1-2,3-4 connect, the control utmost point G1 of controllable silicon V1, V2, V3, V4, V5, V6, G2, G3, G4, G5, G6 connect with pulse transformer respectively, the forward controllable silicon can be worked, and oppositely silicon controlled G7, G8, G9, G10, G11, G12 and pulse transformer disconnect.
Vout2＜0, IC11/1 is high level T7 conducting, relay R L4, RL5, RL6 adhesive, contact 1-2,3-4 connect, the control utmost point G7 of controllable silicon V7, V8, V9, V10, V11, V12, G8, G9, G10, G11, G12 and pulse transformer are connected, oppositely controllable silicon can be worked, and forward silicon controlled G1, G2, G3, G4, G5, G6 and pulse transformer disconnect.
Claims (4)
1, a kind of big capacity titanium alloy pulse micro-arc anodic oxidation is dynamically controlled the control method of power supply, it is characterized in that this method comprises the following steps:
1), initialization, the various functions of automatic checkout equipment show that the safe array of various parameters, parameter comprise the line correlation prompting of going forward side by side of time control, voltage, current range;
2), input parameter, the low temperature pulse micro-arc anodic oxidation of titanium alloy, whole film forming procedure are divided into three different control stages, all parameters of three phases are all once imported at this and are finished;
3) three phases that is carried out to membrane process, successively is: T1 section, T2 section, T3 section, and wherein the initial micro-arc anodic oxidation film of T1 section generates under high current density fast, and thickness is 0.5～1.0 μ m, and the anodic current density maximum reaches 10～15A/dm
2
The micro-arc anodic oxidation of T2 section titanium alloy mainly is in second time period, and in this time period, because the anode oxide film that generates under high voltage of titanium alloy is a dielectric film, when film thickness reaches 0.5 μ m when above, the resistance value that records oxide-film at 500V reaches 10
5Ω is an insulating barrier, if want oxide-film to thicken, must oxide-film be thickened anode oxide film puncture, the conducting that had before generated by boosted voltage, by continuous boosted voltage, the continuous current density of keeping by part that punctures;
The 3rd time period of the micro-arc anodic oxidation of T3 section titanium alloy, because titanium alloy anodic oxide film is a porous, when oxide thickness reached the drawing regulation, can not cut off the power supply immediately stopped, and handled and will carry out sealing of hole.
2, dynamically control the control method of power supply by the described big capacity titanium alloy pulse micro-arc anodic oxidation of claim 1, it is characterized in that described T1 section, following parameters is set in the generation of its micro-arc anodic oxidation film:
Time control: 0.5～1.5min;
Stop voltage scope: sharply be increased to 80～100 volts from zero in 0.5～1.5min operating voltage;
Current range: the anodic current density maximum reaches 10～15A/dm
2
Current-limiting protection: when current peak reaches or be about to reach the maximum current that equipment allows, will carry out the current limliting adjustment automatically, and current value be adjusted to the lower limit of the current range of permission;
Pulse duration: at anodised pulse duration phase I t1 is 0.8～0.9 second, and be 0.01～0.2 second break time, and tracking frequency is 0.25～2.95HZ.
3, dynamically control the control method of power supply by the described big capacity titanium alloy pulse micro-arc anodic oxidation of claim 1, it is characterized in that described T2 section, when titanium alloy generates thickness and reaches 0.5 μ m with upper nonconductive Film under high voltage,, must pass through boosted voltage if want oxide-film to thicken;
Set following parameters:
Time control: the length of micro-arc anodic oxidation second stage time, depend on requirement to thickness, oxide thickness is at 2-25 μ m, the time 35-120min of this period;
Pulse duration: output waveform is the square ripple, and removing forward wave is 0.2-0.6 second at anodised second stage pulse duration t2; The duration of negative wave is 0.1-0.2 second;
Tracking frequency: in the anodizing process, the pulse tracking FREQUENCY CONTROL is at 0.8-1.2HZ;
The forward constant current: constant in this stage pulse forward anodic current density, keep the current density of anode at 1.5-2A/dm by the voltage of continuous rising load
2, the gross area of root a tree name dress odd part accurately calculates total electric current;
The negative sense constant current: this stage pulse negative sense anodic current density is also constant, at 0.1-0.3A/dm
2The gross area of root a tree name dress odd part accurately calculates total electric current;
Automatically the guarantor's constant current of boosting: the anodised voltage that constantly raises, to keep the constant current of whole second stage process;
Voltage-limiting protection: when reaching voltage peak or being about to reach the maximum voltage of equipment permission, will carry out the pressure limiting adjustment automatically, and magnitude of voltage be adjusted in the scope of permission.
4, dynamically control the control method of power supply by the described big capacity titanium alloy pulse micro-arc anodic oxidation of claim 1, it is characterized in that described T3 section, titanium alloy anodic oxide film is a porous, when oxide thickness reaches regulation, can not cut off the power supply immediately stops, and handles and will carry out sealing of hole
Set following parameters:
Time control: the time was controlled at 4～8 minutes;
Pulse duration: output waveform is the square ripple, and forward wave is in the anodised phase III, and pulse duration t3 is 0.2～0.6 second;
Constant-pressure drop stream: stop to boost, under higher constant voltage, the forward constant current was reduced to zero in 4～8 minutes;
Step-down is made zero: after electric current makes zero, voltage is reduced to zero automatically by 100～300 volts.
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| CN102653877A (en) * | 2011-03-04 | 2012-09-05 | 汉达精密电子(昆山)有限公司 | Electrolyte for anodic oxidation treatment of magnesium alloy and treatment method thereof |
| CN103823370B (en) * | 2014-01-24 | 2016-03-30 | 广州市精源电子设备有限公司 | Micro-arc oxidation process self-adaptation control method and system |
| RU2613250C2 (en) * | 2014-06-24 | 2017-03-15 | Борис Михайлович Клименко | Micro-arc oxidation device |
| CN108103553B (en) * | 2017-12-28 | 2019-11-26 | 大博医疗科技股份有限公司 | A kind of colorful anode oxidation membrane preparation method of titanium surface non-impurity-doped low defect |
| RU2736943C1 (en) * | 2020-04-24 | 2020-11-23 | Акционерное общество «МАНЭЛ» | Coating method for articles from valve metal or its alloy |
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