Main Cathode

The main cathode is an indispensable core component of the impressed current anodic protection system, which is widely applied in anti-corrosion protection of metal equipment such as chemical storage tanks, pipelines and industrial reaction vessels. Different from sacrificial protection structures, the anodic protection system relies on external power supply to form a stable electrochemical loop, and the main cathode undertakes the key function of electron collection and circuit conduction in the whole system.

In the working process of the system, the protected metal equipment acts as the anodic and is passivated by applying a stable positive potential to inhibit oxidative corrosion. As the negative electrode of the loop, the main cathode cooperates with the potentiostat to receive the reflux electrons generated by the electrochemical reaction of the protected anodic equipment, forming a closed and continuous current loop. This core function ensures that the system potential remains stable within the optimal passivation range, avoiding potential fluctuation, deviation or failure of passivation film caused by unsmooth electron circulation.

Made of high-conductivity, corrosion-resistant and stable inert materials, the main cathode can adapt to harsh working environments such as strong acid, high temperature and humid electrolyte medium. It can evenly distribute the protection current of the whole system, effectively eliminate the problem of local current concentration and excessive polarization of equipment, and prevent local corrosion damage of metal structures. In addition, the main cathode assists the potentiostat in real-time potential regulation, maintains the long-term integrity of the metal passivation film, and greatly reduces the electrochemical dissolution rate of equipment.

As the key to balance the operation of the anodic protection system, the main cathode does not produce consumption in the working process, with low maintenance cost and long service life. It provides reliable guarantee for the safe and long-term operation of industrial metal anti-corrosion equipment and is a crucial part to improve the efficiency and stability of anodic protection engineering.