Dans right on with the rinsing, I’ve sailed my boat in salty or brackish water for 21 years now and I almost always have sprayed it off soon after sailing. Twice a year I take it to the car wash and really let err have it. I have very minor corrosion problems.
My boat was two years old when I bought it. About the third time out the mast base let loose while I was stepping it. It’s never a pretty sound! After cleaning the you now what out of my pants, I found that the previous owner had used aluminum rivets in the mast to base connection. I am not sure why a two year old boat had the rivets replaced, but I do know he took it out one time, flipped it in the inner mouth of the jetty, with his wife, and never sailed it again. One guess is that the mast filled and he figured the only way he could get the water out was to remove the mast base.