Why not aluminum?

[Farlander]

Has anyone tried aluminum electrodes?  It is my understanding that these do not corrode in water, and are a LOT cheaper...

Also saw a guy on youtube using 316 SS foil.  He was having great success using Dry Cell, 2.5 liter per minute at 12A 12V.

Just heard about a coating process called Carbon Raptor Coating.  It's for automotive applications, applies a 2-4 micron thick layer to any metal, can even be used inside a cylinder so I assume it's good for electrolysers.

I built a working PWM using the LM324 FINALLY.  100% fully adjustable duty cycle, variable frequency too.  ONE chip, ONE board, NO decade switching, 8 resistors and one capacitor, total for under $10.

Will post details soon on my site

[Jokker]

There is pretty good explanation.

Have you seen stainless steel tubing corrosion naa...
Aluminum is pretty good at "corrosion"  I do not really know about all types of it but ... it does corrode.

Just do as i did. Take a aluminum spoon and use t as electrolyte. Soon you will notice that water is not clean.

[Aveon Blitz]

the problem with aluminum is the aluminum oxide coating on all aluminum exposed to air or water. during the electrolysis process, the aluminum oxide has a tendency to dissociate from the aluminum plate, thus resulting in short life plates. this also happens with stainless steel, which is why such things as foil and thin coatings would not be ideal. in stainless steel, the plate corrodes, but at a slow rate. ideally, a electrolysis device should be made form a material that corrodes, but this means that the electrodes must be replaced, so HHO devices use less corrosive materials, a plate coated in platinum or gold would be best for HHO developers. i have also heard that a compound that contains aluminum is being looked at for generating hydrogen on demand, i think it also contains gallium.

[zzzz]

Al is very good carthod ( - ) for test, bubble is very fine and you will got more bubble at the same current, but as you know it have more resistances, same plate area you will add more electrolyte to get the same current as SS plate,
Al can work very long if you don't let's them touch bubble from +(oxygen) that normally use SS.

from pic
tube is -Al
smaller rod is -SS
with the same +SS (stainless Tea pot  )

[professor]

There is pretty good explanation.

Have you seen stainless steel tubing corrosion naa...
Aluminum is pretty good at "corrosion"  I do not really know about all types of it but ... it does corrode.

Just do as i did. Take a aluminum spoon and use t as electrolyte. Soon you will notice that water is not clean.

Not all grades are corrosive there are many marine Vessels and Fishing Boats  that are used in Saltwater and show very little corrosion
we used a lot of 6061T6 on our Submersibles and 316L SSl and this combination did not even produce an electrolysis to the point of being destructive. Then there is a Alcan alclad Aluminum I believe it was 2024 it was impervious to corrosion as long as you did not scratch its coating.
I had a higher Gas output using one Alu and one SS rod than just all SS.
If you use any Chemicals you make a good halfwave rectifier that way. Perhaps you can then eliminate the HV Rectifier used by SM?
professor