“Corrosion is an irreversible interfacial reaction of a material (metal, ceramic, polymer) with its environment which results in consumption of the material or in dissolution into the material of a component of the environment.” IUPAC - International Union of Pure and Applied Chemistry.
Electrostatic discharge, or ESD, is an exchange of electrons between materials, often from the buildup of electrons on resistive materials which then discharge through conductors. This can be damaging to small electronics or delicate microchips.
