One thing you can do to prevent rust is put a patina on it. It will not be shiny, but give it an old-time look, which you may or may not like. If you want to do it, clean it off really good, then leave it for a few hours in: potato, mustard, warm vinegar, mayonaise, almost anything slightly acidic. Many of us do this, it gives the knife a mottled gray patina that really helps prevent rust and (I think) looks great. But again, you might not like the look of it, so consider it carefully.