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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