rusting

(noun) the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water. Synonyms: rust.

(verb) become destroyed by water, air, or a corrosive such as an acid. Synonyms: corrode, rust. Examples: "The metal corroded." "The pipes rusted."

(verb) cause to deteriorate due to the action of water, air, or an acid. Synonyms: corrode, eat, rust. Examples: "The acid corroded the metal." "The steady dripping of water rusted the metal stopper in the sink."

(verb) become coated with oxide. Synonyms: rust.