There is no real between the dial and the movement so if salt water got to the dial it got to the movement as well.
The watch needs proper servicing and it needs it now or else it is toast.
[Edit] Just realized you bought only the dial. I would think washing with fresh water and allowing to dry completely would remove the salt residue.
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Today, I believe my jurisdiction ends here...
Lug Hole LoverŪ
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