Combined protection of cathodic protection and corrosion inhibitor

Corrosion inhibitor refers to adding a small amount of some medium into the corrosive medium, which will slow down or even stop the corrosion of metal. In some cases, the effect of corrosion inhibitor alone is not very good, or it is not very economical.



The combination of cathodic protection and corrosion inhibitor can solve some problems of corrosion inhibitor. For example, when the brass pipe of seawater condenser is corroded, it is the perforation corrosion damage caused by brass falling off zinc. The existence of shielding will make the protection current in the middle of the pipe unable to achieve protection.



After cathodic protection, the concentration of hydroxyl ions will be increased near the seawater on the brass surface, which will form a good hydroxide film and improve the current dispersion ability. Therefore, the middle part of the pipe will also be well protected.