Is corrosion a chemical or physical change?

1 Answer
Oct 24, 2016




Corrosion is generally the reaction of a metal surface with oxygen, and/or water and/or sulphur, such that the surface is converted to the metal's oxide, hydroxide or sulphide.

As there is a chemical reaction taking place, the process is very clearly a chemical change. For example, you start off with iron (Fe) and end up with iron (III) oxide (#Fe_2O_3.nH_2O#)