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I've done a lot of testing in the last 2 years, with a tubular cell, starting with a tube pair, then 3 tubes, on 12V and I've always ended up with corrosion and brown water after a few months. I was using distilled water and KOH only.

I now switched to a drycell with 5 neutral and have solved the corrosion problem so far..

I was wondering what is the main factor for corrosion, is it the voltage between the plates, or power VS surface area, assuming we're only using distilled water and KOH / NaOH..?

I supposed it is both, but wich one is the greatest contributer?

I'm trying to figure this out because I'd like to build a circulating cell, with only 2 tubes, that is 12V between the tubes. The smaller the gap, the higher the voltage, the least electrolyte is needed to do the same amount of gas. And, it creates a more ionized , more powerful gas with higher voltage ( 12v ) between the electrodes.. At least that's my assumption.. 

The only problem with 12V between the plates is that it can ( and will ) create corrosion and heat. 

It CAN be OK IF:

-Corrosion is not too much

-Electrolyte is circulated and filtered

-Water volume is large enough to compensate for heating, or a heat exchanger is added.

Circulating the electrolyte allows for the creation of a large amount of gas with a small volume of active electrolyte; ie the volume between the electrodes, because the gas forming is quickly evacuated from the active electrode volume. This way, electrode surfaces are always actives, because always wet, even with a very small gap between the electrodes. 

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