I rinse my halyard joint after each sail, but it will happen again eventually since the join is made with dissimilar metals so you'll get galvanic corrosion eventually. But, for $60 or so, you can keep a spare. Pretty cheap, really.
You "can" replace the wire join with a small diameter high tech line join which won't corrode. You can also tie a knot in the high tech line at the right spot to catch the hook--best to put a stopper on top of the knot. I think an empty brass shell casing would work-especially if you crimped it over the knot. I have done this and it is my spare...I didn't have a shell casing, so I used a small washer, but the washer moves out of place which is less than ideal.
Formerly raced F24 Mk II