Cathodic protection of circulating water pump in power plant

The corrosion of metals in corrosive water media is due to the instability of their composition and electrochemical inhomogeneity. Viewed from the outside, the uniformity of the material of steel, however, when it is immersed in seawater, used for metal material itself organization structure and the inhomogeneity of physical state of, in the metal surface to form a number of macro and micro anode zone and cathode zone, produced water in between cathode and anode current through, move electrons from the anode to cathode area, part of the metal loss of electronic anode area is a ion, It dissolves in sea water and corrodes the metal in the anode area. For the whole pump, these microcurrents may add up to a considerable amount.

Install the anode on the pump, the DC power supply through the anode will protect the current to the inner wall of the pump, shaft and impeller, so that the cathode polarization, so as to suppress the corrosion of the inner wall of the pump, shaft and impeller.

The reference electrode is installed on the water pump to monitor the water pump potential and provide control and measurement signals to the DC power supply. When the manual rectifier is used, the output current of the rectifier can be manually adjusted according to the size of the reference electrode to measure the potential, so that the water pump can be maintained in the protective potential range. When the potentiostat is used, the potentiostat can automatically adjust the output current of the potentiostat according to the size of the potential measured by the reference electrode, so that the water pump can be maintained in the protective potential range.