rustless

/ˈrʌstləs/
adjective
  1. Resistant to rust; not likely to rust.
    • They chose rustless fixtures for the outdoor kitchen.
    • The rustless steel pan lasted for decades without corroding.
    • Modern alloys are often rustless, making them ideal for marine use.
  2. Free from rust; not having any rust.
    • The rustless surface gleamed in the sunlight.
    • She polished the metal until it was completely rustless.
    • The old tools were surprisingly rustless after being stored in oil.