Geothermal energy use is already established, particularly where there is volcanic or seismic activity. Heat is usually extracted either by tapping into hot water or pumping water into the hot rock. In either case, the resulting hot water can also be saline, and so corrosive. Nickel-containing stainless steels and corrosion resisting nickel alloys may be needed to withstand these conditions.
10083 Corrosion Performance of Ni-Cr-Fe Alloys in Geothermal Hypersaline Brines
11004 Materials for Saline Water Desalination and Oilfield Brine Pumps