To insulate $\ce{Pt}$ wire heaters, I plated them with $\ce{Ni}$. After switching on the heater for the first time, green $\ce{NiO}$ is formed which is insulating and protects the $\ce{Pt}$ from shorting. After using the heaters for a week or so, the $\ce{Ni}$ slowly falls away and the $\ce{Pt}$ heater shorts and cuts.

What is the best method of stripping away the balance $\ce{NiO}$ from the used up $\ce{Pt}$ heater?

  • $\begingroup$ It took me 10 seconds to find the Wikipedia page for NiO. It's a basic oxide. $\endgroup$
    – gsurfer04
    Jan 13, 2017 at 10:12
  • $\begingroup$ Wikipedia says, its solubility in H2O in water is negligible. While it also says it's soluble in KCN. But KCN's safe use a bit of concern. $\endgroup$ Jan 13, 2017 at 12:50
  • $\begingroup$ Can $\ce{HCl(aq)}$ dissolve it? $\endgroup$
    – DHMO
    Jan 14, 2017 at 10:49
  • $\begingroup$ @DMHO link.springer.com/article/10.1023/A:1020634014278 $\endgroup$
    – permeakra
    Feb 13, 2017 at 16:15

1 Answer 1


As mentioned by @Mockingbird, nickel oxide is somewhat soluble in potassium cyanide which will dissolve the oxide to form nickel cyanide, $\ce{Ni(CN)2}$ and potassium tetracyanonickelate, $\ce{K2Ni(CN)4}$ but potassium cyanide is very, very toxic.

Do not use it until and unless you are a professional chemist.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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