The Naked Scientists

The Naked Scientists Forum

Author Topic: What is this black sludge?  (Read 1291 times)

Offline thedoc

  • Forum Admin
  • Administrator
  • Sr. Member
  • *****
  • Posts: 511
  • Thanked: 12 times
    • View Profile
What is this black sludge?
« on: 18/08/2014 15:30:01 »
George asked the Naked Scientists:
   
I am producing about 2 cubic foot of Hydrogen /oxygen per six hours. I am increasing that, but what I am finding is a BLACK sludge near the positive plates. I don't know how to ask the question as to what this sludge may be. I am using water, salt, muriatic acid on 305 stainless steel plates. 6 amp, 12 volt.
What do you think?
« Last Edit: 18/08/2014 15:30:01 by _system »


 

Offline chiralSPO

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 1872
  • Thanked: 143 times
    • View Profile
Re: What is this black sludge?
« Reply #1 on: 18/08/2014 18:57:54 »
If you are using muriatic (hydrochloric) acid and salt (sodium chloride), your going to be generating a lot of chlorine (maybe instead of oxygen). This chlorine is formed at the anodic (positive) plates, and will corrode them quite effectively.

Please tell me more about this cell. Amps and volts is a start, but how many electrodes are you using? And what is their surface area? And are they connected in series or parallel? ie what type of electrolyzer are you using, and how big is it?

With stainless steel plates, I would recommend you use sodium hydroxide or potassium hydroxide instead of the salt and acid mix--it will be more efficient and the electrodes will last much longer.
 

The Naked Scientists Forum

Re: What is this black sludge?
« Reply #1 on: 18/08/2014 18:57:54 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums