Active Cathodic Protection

Definitions

Electrode	A substance that is a good conductor of electricity. An electrode acts as a metallic contact through which the current enters and leaves an electrolyte.
Anode	An electrode where oxidation occurs.
Cathode	An electrode where reduction occurs.
Electrolyte	A solution that contains salts and minerals. This medium is electrically conductive (sea water, for example). These are made up of atoms and ions can either gain or lose electrons. Electrolytes are also called Ionic solutions.
Oxidation	Metals react with oxygen in water or in air to form oxides. For example, when iron is in contact with water, it rusts. Rusting is an electrochemical process that begins when iron (Fe) is in contact with water, and loses its electrons to Oxygen (O2) in the water to form ferrous oxide. Ferrous oxide is the first step to corrosion.
Reduction