Revolvers, I dont care if stainless or not I dont think would hold up long term in any sort of salt water environment. (no firearm would)

The chrome lined bore of the barrel sure wouldnt like it

Above that, inside the action, the rebound slide spring, cylinder stop spring and cylinder release bolt spring and sear and hand spring would be the first to go. Especially the later two.

The rebound slide itself, trigger and hammer on earlier 66's and 686's re chromed, so they might be ok for a while.

Wonder what the procedure was to de-salt the revolvers were? I would bet the armor would at minimum do a full disassembly and after thoroughly rinsing all of the parts individually, soak them in deionized water for a period of time, then fully clean and oil with something like hoppes or CLP, followed by reassembly with a replacement of all springs.