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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I believe the corrosion comes from 3 factors 1. To much amperage being pushed through for a given surface area causing heat to build up and micro fracturing the SS and opening it up to corrosion. 2. Gasket material breaking up and and clogging up the gap between the plates. This is causing heat to build up and then leading to micro fracturing again. The number 3 reason I believe comes from the manufacturing of the reactive plates. If you punch out/laser cut/water jet cut for water or gas to flow you create 90 degree turns in the plates which when electrified create points of amperage leaking and then leads again to micro fracturing and corrosion. Your solution of circulating might solve the problem as well as sanding down any corners that are exposed in the reactive areas of the plates, especially the holes that allow for gas or water to pass. I believe there is a rule of thumb that states .5 amps per square inch of surface area is good guide to use when sizing your cells reactive surface area.

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