Chemical corrosion refers to the gradual destruction of a metal's surface due to the reaction of the surface with substances in its external environment. It is often characterized by the oxidation of a metal with an acid to form oxides.
Chemical corrosion commences on a location where a given metal is under stress or isolated from air circulation. This prompts the metal ions to dissolve in a moisture-filmed environment, ultimately accelerating a reaction between the metal ions and water. The reaction forms hydrous oxides (known as rust when reacted with iron) and free ions, leading to corrosion.
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