838Views6Replies

Author Options:

I'm trying to make black iron oxide FE304 and using the method of electrolysis. Answered

I'm trying to make black iron oxide FE304 and using the method of electrolysis i'm using salt water and two washers for the electrodes, however my oxide instead comes out as dark green?It is magnetic, but only with a strong magnet.Is there any way of making black iron oxide with this method?thanks?


I should not i am trying to make ferrofluid.

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
shomas
shomas

3 years ago

Im not certain but i believe you did make Fe3O4. And as for its magnetic properties. Small nano particles are pushed around more easily by Brownian movement in the water. And thus may appear to not be as magnetic. If its not fe304 then maybe its iron hydroxides. I'm looking at doing the same thing and how to dry it without it turning to Iron (iii) oxide.

0
KaiserSose
KaiserSose

Reply 7 months ago

You are correct... Sort of.
Fe3O4 can produce a green oxide layer.
The weird part would be having it happen in the same NaCl solution that created it.

0
Burf
Burf

8 years ago

I can't say positively, but the fact that you say it is green in color makes me think you are getting ferrous chloride tetrahydrate. You probably need to use a different electrolyte.

0
Burf
Burf

Answer 8 years ago

I forgot to mention, if the washers are galvanized, don't use them, get some unplated iron.

0
mrn
mrn

Answer 8 years ago

I don't know if there galvanized or not, I will try something else though,

Also I read somewhere that by adding a solution of NoAH it would turn orange oxide into black, however they said NoAH could be made from using salt as a electrolyte.

But I will try something else.

0
shomas
shomas

Answer 3 years ago

Not NoAH. Instead NaOH (Na sodium, OH hydroxide)