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HHO generator with iron electrodes Answered

Hello Everyone,

I recently found out about Sodium Hydroxide as an electrolyte.
I have read that it does not affect the electrodes like salt or baking soda and it does not create any weird gasses
like chlorine.
The main reason for using stainless steel electrodes is to prevent this corrosion, but since sodium hydroxide does not
create this corrosion, can I just use the much cheaper iron or regular steel as the electrode plates?

Thanks in advance


Discussions

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0
Kiteman
Kiteman

5 years ago

Small but important point; there is no such thing as "HHO".

Electrolysis actually generates two parts (by volume) of hydrogen gas and one part oxygen gas.

Be aware that if you allow the gases to mix before you collect them, the resultant mixture is highly explosive, with a flame-speed roughly five time the speed of sound.

0
JStuyfzand
JStuyfzand

Reply 5 years ago

2 parts H, 1 part 0, HHO!

But it should be called 2H2 o2 right?

0
Kiteman
Kiteman

Reply 5 years ago

The people who coined the term "HHO" use it to mean that the gases are "monatomic" - single atoms of hydrogen and oxygen floating around, somehow carrying more energy than "normal" diatomic H2 & O2, despite both claims being physically impossible.

Yes:

2 H2O -> 2 H2 + O2

0
omkharwar77
omkharwar77

1 year ago

Which metal electrode plate can I use

0
Orngrimm
Orngrimm

1 year ago

As you already got the suggestion of carbon, i want to add a weird idea here:
What about those carbon felt-mats!? They are used as protection for welding i think and available in big box stores as far as i know... Or online for really cheap
https://www.aliexpress.com/item/32963572910.html
But they are carbon and have a HUUUUUGE surface area. May be wort giving that a try?

3
Downunder35m
Downunder35m

5 years ago

I highly doubt wou will be happy with the results.
There is always an ion exchange happening, so at least one electrode will suffer.
As an alternative give carbon a chance, like from a carpenter pencil or old zink carbon batteries.

0
JStuyfzand
JStuyfzand

Reply 5 years ago

that has a small surface, which is needee for a HHO generator.

And carbon plates are wayyyyy too expenive.

0
Kiteman
Kiteman

Reply 5 years ago

Line up a lot of pencil leads side-by side = a carbon plate.

0
JStuyfzand
JStuyfzand

Reply 5 years ago

That will be a lot op pencils, I will need like 30 plates! :)

0
Kiteman
Kiteman

Reply 5 years ago

It depends on the scale you're after, of course, but I'd be willing to bet that a few dozen pencils would be a lot cheaper than sheets of carbon.

Still, it's a bootless discussion until you've done the tests to check whether your chosen electrolyte corrodes your chosen electrodes.

0
JStuyfzand
JStuyfzand

Reply 5 years ago

I just did the test, no corossion so far, I will let it run for ~24 hours, 1 spoon of Sodium hydroxide and good bubbles without weird smells,

0
Downunder35m
Downunder35m

Reply 5 years ago

Another test you can make is to cover a bit of the surface with paint.
Once the test is over use acetone to remove the paint and clean the metal.
If it is corroding you will see it on the difference in surface structure.
Also when you evaporate the remaining liquide you should end up with a white residue, if it turns rust brown you have a problem.
As an alternative for small size and big surface try stainless steel wire mesh.
You can get is quite cheap in the plumbing section as filters for rain diverters and similar.

1
JoshuaF133
JoshuaF133

2 years ago

You can harvest large pieces of carbon from zink batteries "heavy duty" i believe
.. remove the outer plastic sheathing and pop off the positive cap and gently rotate the center rod out viola carbon rod

0
Orngrimm
Orngrimm

Reply 1 year ago

Exactly what i wanted to suggest :)
Best and cheapest readily available (!) electrodes

0
sarmadsian
sarmadsian

1 year ago

Electrolysis is ok, however, i m unable to collect gas in bubbler.
any guidance!!!!

0
Kiteman
Kiteman

5 years ago

There's a simple test - try a small test cell with a couple of iron nails as electrodes. No need to collect the gas, just watch the nails.

0
JStuyfzand
JStuyfzand

Reply 5 years ago

Allright, i tested it, and the corrosion is slower than with salt but still, there was a oxide crust.

Seems like steel is the way to go, any suggestions where to scavenge it? :)

0
DavidS1381
DavidS1381

Reply 1 year ago

Go to your local scrap metal business. .
You can get 304 s.s from them as most manufacturers of truck bodies for oilfield. Recycle scrap cuts.