Thanks for posting. See our 10" 36-004-10 Hinge Set. This set is stainless steel, which should certainly prevent this kind of corrosion. Just make sure the dimensions square up with what you have. Be sure to replace both hinges in the window at the same time. Let me know if you have further questions.
Great! I'm glad to hear that everything matches.
Concerning the operator, it's hard to tell exactly what you have while it's still installed, but something like our 39-027E might be what you need. Make sure to disconnect the arm before you measure it to ensure not only that our size is accurate, but also that the wheel at the end of the track is the same design.
Yes, as long as the arm size then I agree. The 39-027E should work perfectly well for you.