I know only as much about chemistry as I can remember from a year in college. So, please speak slowly and use short words.
I'm trying to decide on an appropriate material for a heat-transfer coil that is meant to remain submerged for extended periods in salt water, within a few feet of other metal parts.
I'm designing a solar still that will use a cooling/condensing coil to take advantage of the heat differential between the solar-heated evaporation chamber and nearby (cooler) water temperature. It will be mounted on a sailboat. The coiling coil will probably be about 12-18 inches long and 2-3 inches diameter.
Impulse was to use copper, but I'm not sure how this will react in a salt-water environment over time. I know that sea life will stay off of it, since copper is the active element in many bottom paints designed to minimize subsurface growth.
Any help is appreciated. Maybe the answer is to use a sacrificial anode on the coil? Or, maybe some other material would be more suitable for long-term use?