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inoxidizable

inoxidizable, a.
  (ɪnɒksɪˈdaɪzəb(ə)l)
  [in-3.]
  Not oxidizable; that cannot be oxidized; incapable of rusting.

1864 Webster, Inoxidizable, Inoxydizable. 1880 W. C. Roberts Introd. Metallurgy 6 Separating it from precious or inoxidizable metals. 1883 Fisheries Exhib. Catal. 76 Ladies' Work Tables..mounted with engraved Argenton or Inoxidisable Metal.

Oxford English Dictionary

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