Probably not corroded, they just have a lot of surface area friction to overcome, and the fastener material is soft and will round off. Use a pair of flare nut wrenches. Use acetone and dexron half and half as a penetrant. I think only one end of the hose has a swivel connector, so you may have to take both loose. It's one of my most hated v6 jobs.

If you find you have to cut the hose, all is not lost. You can whiz wheel or hacksaw the metal hose crimps off and cut off the hose and either have a hydraulic hose shop crimp on new hose or use FI fuel hose and double hose clamps. It's only about 40psi...