Cathode

Cathode rods are essential auxiliary electrodes in impressed current anodic protection systems, widely deployed for corrosion prevention of metal tanks, pipelines and reaction vessels in chemical and sulfuric acid industries. Working together with potentiostats, reference electrodes and protected metal bodies, they build up a complete electrochemical circuit and undertake critical current conduction tasks throughout the operation.

Manufactured from high-conductivity and inert anti-corrosion materials, cathode rods can withstand harsh environments including strong acid media, high temperature and long-term electrochemical reaction. Unlike the protected metal which acts as the anodic, cathode rods serve as the negative pole of the loop. They continuously receive electrons flowing back from the protected equipment and transmit the current back to the power unit, enabling the whole system to operate in a stable closed loop.

The layout and quantity of cathode rods directly affect protection efficiency. Proper arrangement helps evenly distribute current over the equipment surface, effectively preventing current concentration and local over-polarization. These problems would otherwise damage the dense passivation film and trigger partial corrosion. Besides conducting current, qualified cathode rods feature low consumption rate and stable performance, requiring little routine maintenance.

In practical application, cathode rods cooperate closely with potentiostats to keep the anodic potential within the ideal passivation range. They never participate in destructive chemical reactions during service. With reliable durability and outstanding electrical performance, cathode rods lay a solid foundation for the stable operation of anodic protection systems. They effectively extend the service life of industrial metal equipment, cut operational costs and guarantee safe production in corrosive working conditions.