Digesting Gold Plated Stainless Items in Nitric

[P_CARROLL]

IF you need to dissolve anything with stainless in it use HCL. I process mil spec avioincs pins alot and found that HCL destroys the passivation layer on the pins and dissolves the copper as well.Leaving only the gold.

 

[jaun]

I guise we are lucky here in South Africa, nitric is readily available at any agricultural shop and is cheaper than HCL, $8 for 25L

 

[steveonmars]

IF you need to dissolve anything with stainless in it use HCL. I process mil spec avioincs pins alot and found that HCL destroys the passivation layer on the pins and dissolves the copper as well.Leaving only the gold.

This would be plain HCL unheated, just let everything sit and let it work?

Steve

 

[GeeDub]

Fe - reacts with nitric,

Just a note here. At around 20 to 22%, the Fe is passivated and won't dissolve
-G