1
$\begingroup$

I have use two aluminum pieces as electrodes to electrolys salt (NaCl) water. After the experiment, I found that wherever electricity flows, the electrode will be covered in some blackish substances. One electrode has more dark substances than the other

enter image description here

Are they Al2O3? Or are they some other substances? Why is one electrode having more and the other having less?

$\endgroup$
  • $\begingroup$ Alloying in the aluminum, maybe? $\endgroup$ – Oscar Lanzi Dec 29 '19 at 18:10

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.