CATHODIC PROTECTION FEASIBILITY OF WATER HEATERS

The corrosion mechanism and electrochemical performance of water heater inner hull were studied experimentally alloy and the protection method was optimized.Magnesium sacrificial anode was usually adopted to protect the inner hull of water heaters.The disadvantage of this method was that the potential difference between magnesium anode and inner hull was too big.The consuming of anode was quick so that the anode life was less than 2 years.Impressed current cathodic protection method is a perfect method used in water heater.A noble metal is adopted as the auxiliary anode and cathode is the water heater inner hull.The system adopts constant voltage controlling method,it is easy and convenient.The anode will not be dissolved and has long life,so the water heater can be used for long time.