1) Antirust 2) Rustless 3) Rustproofed 1) Like bronze or tin 2) Not subject to rusting 3) Protect against oxidation 4) Rustless 5) Rustproofed 6) Treated against rusting 
Rustproofing is a condition of preservation or protection, by a process or treatment whereby the rate at which objects made of iron and/or steel begin to rust is reduced. The degradation in the long term can not be stopped completely, unless the rustproofing is periodically renewed. The term is particularly used for the automobile industry. ==Appl...
[adj] - treated against rusting
rustproofed adjective treated against rusting
not subject to rusting.