A corrosive material is any chemical (gas, liquid or solid) by which chemical action will cause irreversible damage to the skin or that will materially damage or destroy other goods or the means of transport. Most corrosives are either acids or bases. Metallic corrosion initially involves the pitting of the surface of the metal, followed by gradual erosion of the metal. It may finally result in the formation of holes. Purely chemical corrosion (ie without any mechanical abrasion) is normally initially rapid, but then often slows down due to the formation of a protective coating of corrosion products.

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