How to judge the arc voltage of magnesium alloy micro-arc oxidation?

Substrate material is the same, the arc voltage is basically the same, but by the electrolyte formula is different and the electrolyte temperature is different, the arc voltage will be slightly floating.

To judge the arc voltage, you can use the constant current mode of the micro-arc oxidation power supply, through the observation of the arc to determine the situation: when the specimen surface began to appear a large number of dense, small, uniform white sparks,

that the spark discharge has occurred,

then the density of sparks gradually reduced,

sparks from the beginning of the color white into orange,

But the sparks are still dense and uniform,

The film layer formed is dense,

The microporous aperture is small,

This stage is called the micro-arc stage, then the voltage displayed on the power supply control box at the beginning of the stage is approximately the arc voltage of magnesium alloy (this stage generally occurs 50s-60s after energization)