FEATURES OF ALUMINUM ALLOYS MICROARC OXIDATION IN WORKING WITH MODELS INDUSTRIAL POWER SUPPLY
In this article characteristics of the micro-arc oxidation process with standard capacitor and thyristor power sources are present. The formation of oxide coating on aluminum alloy samples D16 in working with capacitor power source is analyzed. The advantages and disadvantages of this process are listed. The using of high-speed video revealed that with a capacitor power supply burning time microarc discharges on the sample surface is much smaller than the total time of oxidation process. Smooth start and fading of discharges on the surface of the samples is due to the sinusoidal electric current source. The change of electric current density affects the rate on the formation of oxide coating on the sample surface. Increasing current density microarc oxidation increases the thickness of the oxide coating, but the number of defects therein is also increasing.