I use Sodium Persulfate to etch copper on a PCB process. I have been using glass heater on the etching tank but the glass is too fragile; it breaks too easily.

I read that titanium heater is used commercially (in aquariums as well). I don't know much about chemistry, could anyone tell me if it is okay to use titanium with Sodium Persulfate?

Sodium Persulfate to water ratio is 1:10 and the maximum temperature is about 50 C.

  • $\begingroup$ what do you mean by 5dm2? Five liters of water (liter = dm$^3$)? $\endgroup$ – Silvio Levy Jul 27 '14 at 20:50
  • $\begingroup$ I copied pasted from the description on elfa.se/elfa3~se_en/elfa/… I keep acid/water ratio 1:10 $\endgroup$ – sven Jul 27 '14 at 21:12
  • $\begingroup$ So what it says there is that 140g of powder is enough to etch 6 dm$^2$ (about 100 square inches). So 6dm2 is not part of the formula; can you edit your question accordingly? $\endgroup$ – Silvio Levy Jul 27 '14 at 21:45

If the surface of the immersed element is all titanium, the answer appears to be that it won't get corroded unless the temperature is much higher than 50$^\circ$C; see http://www.azom.com/article.aspx?ArticleID=1336

The case is changed if there are joints or parts made of something else, as in this illustration: http://www.saltwatereddies.com/content-popup_image/pID-2199/popup_image.html

I would think that would not be so safe.

Of course, if you've been breaking glass heating elements right and left, you have little to lose by trying the titanium one...

| improve this answer | |

Your Answer

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

Not the answer you're looking for? Browse other questions tagged or ask your own question.