Sacrificial anode cathodic protection, also known as sacrificial anode protection law, is a kind of method of preventing metal corrosion, the reducing extremely strong metal as protection, connected to the protected metal constitute a galvanic cell, reducing the strong oxidizing reaction will be negative and metal consumption, protected metal as the anode corrosion can be avoided.
The specific method is as follows: the metal with strong reducing property is taken as the protection pole, and is connected with the protected metal to form the galvanic cell. The metal with strong reducing property will be consumed by oxidation reaction as the negative pole, and the protected metal as the positive pole can avoid corrosion. Because this method sacrifices the anode (negative electrode of galvanic cell) to protect the cathode (positive electrode of galvanic cell), it is called sacrificial anode (negative electrode of galvanic cell) protection.
