Both Wenger and Victorinox got special purpose models for maritime environment. On the normal knives the salty air
got no influence on a clean and oiled knife. It is important that a knife got oil on the friction parts not only for the friction and functionality but also for protection against corrosion. Oil in the friction parts will prevent corrosion from happening.
It is the same with Victorinox and Wenger knives. There will be no corrosion or rust at all with regular cleaning and oil. I have used a Wenger Ranger and different Victorinox knives in a kayak or at sea. The
tools have been fully soaked with saltwater. When home I put the whole tool in fresh water for some time. Then I rinse well and wipe it clean. When it is dry I put some oil on the friction parts that is mentioned in the manuals.
I can see no signs of corrosion caused by saltwater at all. Never leave any multi-tool or knife in wet condition for storage. Especially saltwater! This is the same with any brand.