cor ‧ ro ‧ sion /kəˈrəʊʒ ə n $ -ˈroʊ-/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Late Latin ; Origin: corrosio , from Latin corrodere ; ⇨ ↑ corrode ]
the gradual destruction of metal by the effect of water, chemicals etc or a substance such as ↑ rust produced by this process:
They are sprayed with oil to prevent corrosion.
Check for signs of corrosion.