This is the 14764th most frequent German word.
oxidiert
"Oxidiert" means "oxidized" – referring to a substance that has undergone a reaction with oxygen.
Here, 'oxidiert' is used as a verb, describing the chemical reaction of oxidation occurring to the metal.
Das Metall auf der Oberfläche oxidiert schnell in feuchter Luft.
The metal on the surface oxidizes quickly in humid air.
In this sentence, 'oxidiert' is used as a verb in the subjunctive mood, referring to the process of oxidation that the treatment aims to prevent.
Dieses Material ist speziell behandelt, damit es nicht oxidiert.
This material is specially treated to prevent it from oxidizing.
Here, 'oxidiertes' is used as an adjective describing the state of the metal as having undergone oxidation.