What is the purpose of the magnesium anode in the water heater?

What is the purpose of the magnesium anode in the water heater?

  1. For protector electrochemical protection of the tank of the water heater against corrosion. Increases the service life of the water heater. With the timely replacement of the worn-out (min 30%) magnesium anode, the water heater is 20-30 years old, without an anode - 1-3 year.
    Mechanism of protection: if two metals are placed in water, one of them, namely the more active Magnesium, will start emitting electrons and attach hydroxyl groups (OH) to the formed ions from water, and the other, less active Iron, will receive electrons, attaching them to their ions. As a result, the more active metal-anode-will be oxidized, and the less active metal-the cathode (water heater tank)-is restored. Thus, the anode will protect the tank from corrosion.
  2. To protect the tan from corrosion, I found it very thoroughly here
  3. For protection against corrosion. Under the action of electric fields, the magnesium molecules evaporate into the water, blocking the cracks in the anticorrosive coating of the inner tank of the water heater. Works ONLY with an Earthed device! Protection against scale on TEN, as some claim does not! In order to protect the heater from scale, it is necessary to use a "dry TEN", which does not have direct contact with water.

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