I have 90% hydrogen peroxide undergoing catalyzed (Pt) decomposition in a chamber made of 316 stainless steel. The peroxide is forced into the chamber at ~200 psi, and temperatures commonly exceed 800 F. The stainless steel has been passivated with sulfuric acid and dilute peroxide. To counteract leaks around the chamber's seal, it's been suggested that I add a copper gasket.

I know that copper and 316-SS will undergo galvanic corrosion in a conducting medium, that superheated steam is generally quite corrosive, and that the presence of lots of oxygen (due to the peroxide decomposition) also contributes to corrosion. It's not clear, however, if steam constitutes a sufficiently conductive medium to cause galvanic corrosion. I'm also uncertain if the combination of high pressure, temperature, oxygen, steam, and dissimilar metals will create a perfect storm of sorts. Can anyone help?

Thanks!

edit: Replacing the copper gasket frequently is not a problem, if it comes to that. If the steel is corroding, though, that's a major problem.

edit 2 : Looks like copper stainless steel is a bad idea, especially under these conditions!