A community for all things knife-related
Rules:
Whether stainless or carbon (or ceramic), you should clean your knife as you work. Doing so will prevent it from rusting and build a patina (if carbon) which will further help prevent rust.
If you want to force the patina, this video by Knifewear might help.
Sharp Knife Shop has a good video about patinas.
Most knife blades do have the type of steel marked on them. There are exceptions, but most of the blades that don't are not good steel.
If you want a knife that goes beyond rust "resistant" you should look at blades made from LC200N. It's a very good steel in its own right and it just does not rust.