Homebrew PCBs

I'm pretty sure ammonium persulfate is ok, but don't take my word 
for it, test a piece to make sure. SS 316 is ok for at least a 
week in ammonium persulfate.
Alkaline ammonia etchants are ok with stainless.

Stainless steel is attacked by HCl and ferric chloride.

Sulfuric acid is ok on stainless provided there is lots of air 
around. i.e. its ok to have be splashed on or be wetted with 
sulfuric (%20). But if immersed in bottom of a tank the SS will 
slowly corrode over a few weeks. I use stainless steel above my 
copper and tin plating tank that continuously get splashed with 
sulfuric acid and they are still shiny after 2 years.


Stefan Trethan wrote:
> 
> which etchants don't eat up stainless steel?
> 
> I know sulphuric acid shouldn't, how about HCl?
> 
> thanks
> st
> 
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