Corrosion

Deteriorative loss of a metal as a result of dissolution environmental reactions. It is a transformation process in which the metal passes from its elemental form to a combined (or compound) form.

The simplest example of metallic corrosion is the rusting of iron in air.

Corrosion products are typically oxides, but other products such as sulphides can also form depending on the environment.

Aluminium

Aluminum corrosion characteristics include general white staining (white rust) as well as pitting.

Iron and Ferrous Alloys

Typically, a pH > 8.0 is required to inhibit corrosion of iron and ferrous alloys in water-based fluids.

Pit

Corrosion localized in a small spot.

Pitting

Localized corrosion of a metal characterized by small blisters under which holes have perforated the metal.

Uniform Corrosion

Corrosion that is uniform across the surface of the object, as opposed to localised corrosion.

See also: Anode Corrosion, Biological Corrosion, Cathodic Protection, Cavitation Corrosion, Corrosion Current Density, Corrosion Inhibitor, Corrosion Potential, Corrosion Protection, Corrosion Resistance, Corrosive Wear, Deposit Corrosion, Fatigue Corrosion, Filiform Corrosion, Fretting Corrosion, Galvanic Corrosion, Pitting, Stray Current Corrosion, Stress Corrosion, Stress Corrosion Cracking, Tubercle, Tuberculation.

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Subjects: Electrochemistry Materials