Abstract: The electrical conductivity and temperature changes of water not only have a great impact on the electrochemical state of water heater tank, but also influence the output of the impressed current cathodic protection system. In order to evaluate the corrosion resistance of water heater tank under different water temperatures and electrical conductivities, open circuit potential and polarization curves of enamel steel were analyzed under the condition of 400~2000 μS/cm and 25~75℃. On this basis, the output voltage as well as the output current of the impressed current cathodic protection system were calculated. CP Manager simulation software was used to optimize the installed form of anodes. The experiments and simulation studies provide a reference for the application design of impressed current cathodic protection system.

Key words: Water heater, Impressed current cathodic protection, Application design