What steel cable won't rust?
What steel cable won't rust? Galvanized cables are regular steel coated to prevent rust. Stainless steel is a form of steel that generally won't rust. Stainless will prevent rust much longer and under much worse conditions (water, salt) than galvanizing will. If the cables don't say stainless on the package, they probably aren't.
How do you prevent cable corrosion?
The industry standard for protection against cable corrosion is to use a silicone dielectric grease with tensioned electrical wrap or heat-shrink tubing over the connection. The silicone dielectric grease fills and air spaces and helps keep moisture out of connections.