OverviewMicro arc oxidation (MAO) is a new surface treatment
technology developed on the basis of conventional anodization. It
is a kind of technology that puts Al, Mg, Ti and other valve metals
or their alloys in electrolyte, makes spark discharge on the
surface of materials by electrochemical method, and forms in-situ
oxidation film with ceramic characteristics on the surface of
materials under the joint action of thermochemistry, plasma
chemistry and electrochemistry.The micro arc oxidation power supply
can be used for micro arc oxidation of aluminum alloy, magnesium
alloy and titanium alloy (with different electrolyte), which should
be reserved in the design.The micro arc oxidation treatment adopts
a new electrolyte with long-term effect and no environmental
limiting elements, which has the advantages of fast film forming
speed, compact film and no loose layer. There is no waste gas
escaping and no waste water discharging in the treatment process,
and the cleaning water can be used as supplementary water for the
oxidation tank in the oxidation process. Perfect technology, green
environmental protection.Process plan2 Technical requirements for
main processes(1) Oxidation: remove the floating dust and obvious
oil on the surface of the workpiece before oxidation, and seal the
parts that do not need to be oxidized.(2) SprayThe spray head
direction and spray pressure are adjustable. The time was
controlled in 1-2 minutes; The spray water shall be replaced once a
week, and the wastewater after replacement shall be used as make-up
water for oxidation tank.(3) Immersion washingThe soaking time is
about 1-2min. The soaking water is replaced once a month, and the
replaced wastewater is used as supplementary water for spraying.3
Main functions of Mao power supply:1. The power supply is designed
and manufactured with high-power IGBT and full switch inverter
circuit; 2. Users can set it according to the maximum value of the
actual output power, constant current mode;3. The controller is
designed and programmed by DSP digital chip to realize full digital
control;4. 10 inch color touch screen display and operation;5.
RS485 interface, optical fiber data transmission, can realize
remote control and display, provide communication protocol;6. Air
cooled, equipped with temperature probe to prevent excessive
temperature difference;7. Over current, short circuit, over-voltage
(high output voltage), over temperature (IGBT working temperature)
and open phase protection;8. Constant current, manual constant
voltage working mode;9. Multiple process curve setting, positive
and negative pulse ratio setting;10. The power supply uses
high-frequency inverter, and the output stage uses high-power IGBT
as chopper;11. Cabinet size: width 1800, height 2000, depth 1000,
(actual delivery size is subject to) spray plastic, gray white
cabinet, wire drawing aluminum panel;Positive output working
parameters: (can be adjusted according to customer needs) Ma.
power: 300kW or customedOperating voltage:at least+U from 80 to
800V;-U from 20 to 200V;Operating current:+ 300A or customed- 300A
or customedFrequency:at least from 30 to 3000 HzDisplay:The machine
is equipped with a display to control of set and actual parameters
as well to provide the ability to connect a computer and perform
real-time voltage and current strength measurements. Reports bugs
in ongoing processesOperating modes:Manual voltage control /
automaticcontrol; Bipolar pulse or unipolar pulseconstant voltage
output (CV) anddirect current (CA) operating modesPower
supply:3-fase, 380V ACControl:Both positive and negative
outputsfrequency, voltage, current andthe duration and number of
work cycles can be adjustedseparatelyProtection:- Automatic
overheating protectionagainst high voltage and currentstrength as
well as phase mixing.- Built-in fan and watercirculation cooler
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