Using Copper and Stainless

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I have been testing using Copper for the negative electrode and SS for the positive.

The interesting part is that as long as the water stays cool, there is no issues with the copper at all, but once the water gets hot, really hot, then we get some green scum.

Never use copper for the positive, it will corode and disolve fast.

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For a more interesting result coat the copper with super corona dope!!

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I have tested with isolated electrodes and didn't see any interesting results.

Have you?

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Did you isolate with super corona dope? It has a dielectric strength of 3000V/mill.

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I used a plastic insulator, I was able to have 50KV between 1 mil water gap, and no gas.

I could see the water surface change shapes. but that was it.

So anyway, what was your results?

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As I continue my tests using copper as negative, I think I know why TAP water gets dirty and how to keep TAP water clean.

So I have 3 tube cells in series, the inner tube is 1/2" diam 3.5" long copper (negative). the outer 1" diam tube is SS and it is 3" long. 

I'm using TAP water with some KOH, and keep the voltage in each cell under 2.6 volts. 24 hours later, the water is still crystal clear.
my conclusions:

Tap water gets dirty when using voltage over 2.6 volts and with plain top water 2.6 volts don't do much. adding KOH allows the cell to operate at lower voltages and water stays clean.

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As I continue my tests using copper as negative, I think I know why TAP water gets dirty and how to keep TAP water clean.

So I have 3 tube cells in series, the inner tube is 1/2" diam 3.5" long copper (negative). the outer 1" diam tube is SS and it is 3" long. 

I'm using TAP water with some KOH, and keep the voltage in each cell under 2.6 volts. 24 hours later, the water is still crystal clear.
my conclusions:

Tap water gets dirty when using voltage over 2.6 volts and with plain top water 2.6 volts don't do much. adding KOH allows the cell to operate at lower voltages and water stays clean.

Very good, electrojolt.
As far as i can remember, the scum is an effect from the chemical reaction.
So you would get it anyway as well on the long term.
But maybe you found something new. Tapwater with KOH is not tested as far as i can remember.

br
Steve

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Here some shots of what the water looks like after over 24 hours of non stop runing pulsed 12 volts using one AMP.