Constantly consumed magnesium anodes have a certain service life that determines their replacement intervals. The service life of magnesium anodes can be estimated based on the amount of current consumed for cathodic protection and the size of the anode. Artificially connecting a certain resistance value (50Ω or 100Ω) resistor in series between magnesium anode and inner liner (processed with magnesium anode as a whole) can effectively reduce the occurrence of current flow and prolong the service life of magnesium anode under the premise of achieving the protection potential.

The conductivity of water varies greatly depending on the geographical area. In the anti-corrosion technology of storage water heater liner, long-life magnesium anode can be better adapted to these problems. Reasonable implementation of cathodic protection can inhibit the electrochemical corrosion of the protected metal, under the same conditions (the same inner liner, the same water quality, etc.), magnesium rod size and weight is the same or similar to the long-life magnesium rod service life is more than 2 times of the ordinary magnesium rod. Long-life magnesium anode can realize long-term effective protection of water heater inner liner and stable system work under the condition of adopting certain measures in use, and the great economic and social benefits are self-evident.