Perform a web search on the "galvanic table". This will tell you where different metals lie in the galvanic series.
Here are some decent tables:
http://www.assda.asn.au/asp/index.asp?pgid=18533
http://64.224.111.143/technicallibrary/corrdoctors/Modules/Aircraft/galvseri-table.htm
This one...
Does anyone have experience with corrosive pitting of Nitronic 60 (or any nitronic stainless steel)? My particular observation is with exposure to borehole fluids in a non-producing gas well. We dont have record of the content of fluid. We saw pitting of up to 40% penetration of a .070" thick...