Cathodic Protection

What is Cathodic Protection?

	Cathodic Protection is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode in the same cell.   Figure 1-3  shows a simple cathodic protection system.
	The steel pipeline is cathodically protected by its connection to a sacrificial magnesium anode buried in the same soil electrolyte.
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Figure 2: Cathodic protection of iron by zinc in hydrochloric acid

Figure 3: Impressed-current cathodic protection of a buried pipeline using graphite anodes

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