Corrosion is an electrochemical process that results in the deterioration of the intrinsic properties of any material because of its reactive interaction with the environment. Corrosion results in the formation of salts or oxides of the original substance. The most widely seen example of corrosion is the interaction of Iron with the environment, resulting in the formation of Iron oxides. These oxides are commonly known as rust.

Corrosion is not limited to metals and can be seen also in ceramic materials. Corrosion usually occurs when substances such as metals and alloys come in contact with moisture. However, there are other substances such as acids, bases, and acid anhydrides that can accelerate the corrosive process and are known as corrosive substances. In most cases, the effect of corrosion is concentrated to a small area and might result in only a crack or pit. Sometimes, because of prolonged exposure or the strength of corrosive substances, the metal might deteriorate. As a result, chemical engineers need to have an extensive understanding of materials resistant to or prone to corrosion when constructing new plants and building new machinery.

This handbook discusses corrosion and lists different types of corrosion. It also discusses the electrochemical reactions behind corrosion and the effects of corrosion.