Exposed iron will gradually rust away to powder.

放在露天的铁会逐渐锈成粉末。

youdao

If you don't paint those metal trimmings on your Windows, they will soon rust away to nothing.

窗户上那些金属花边如不上油漆，很快就会生锈烂掉。

youdao

If you don't paint those metal trimmings on your Windows, they will soon rust away to nothing.

窗上的那些金属花边如果不上油漆，很快就会长锈烂掉的。

youdao

During the Great Depression and afterwards, thousands of Model Ts were discarded as junk, either to rust away or to be cannibalized for parts for wagons and farm equipment.

FORBES: Magazine Article

Oxygen, eventually, will make it rust away.

NPR: Serenading Science In A New Rock Album

His first touch saw Henson attempt an outrageous long-range drop-goal, but the rust was evident as the ball went more up than away and gifted possession back to the Scarlets.

BBC: Ospreys 9-14 Scarlets