Way back in another world there used to be this thing called bronze. Yeah it turned green but it usually outlasted multiple owners and can often still be found in dusty corners of old boat shops, still usable.
Having spent my life on salt water, and having brought boats from the big inland ponds, corrosion is just something you deal with. Rigging and chainplates get inspected and replaced at regular intervals regardless of what you see with your eye. When things such as stanchions get unsightly, you replace them.
Rinsing your stuff as often as possible is a regular thing, as in normal, for people on the big water. It’s part of your maintenance schedule.
Research crevice corrosion if you really want to not sleep well at night. Many a rig have fallen down due to it.
We enjoy and use our equipment in the most corrosive environment on earth. It’s not a bumper sticker, it’s very true. Be religious in your inspections and do the best you can. We all deal with it. 🤙AA