Thanks for all your help, everyone.
The stainless part is quite specialised - a piece of capillary tubing - and although I've asked our manufacturers if they make it in other grades (such as those suggested) they have not yet responded.
In the meantime I'm running a few in-house tests...
Thanks for the advice on the steel grades, I'll look into them straight away.
I have also found that the oxidation products are quite tenatious. Cleaning the metal completely is difficult, and oils and common solvents don't really help.
My searches indicate that some sort of acid might be...
I too have seen the build up of yellow/brown deposits on 304 because of ozone/corona discharges.
Do either of you (or anyone else) know whether 316 would be more/less resistant to this oxidation or just the same?
Thanks for any tips in advance.
