Titanium anodes for cathodic protection pipelines

Titanium anodes for cathodic protection pipelines

MMO titanium anodes are increasingly used in cathodic protection, with advantages such as high current density, acid resistance, and long life, and are used in soil, pipelines, and concrete. Cathodic protection refers to applying cathodic polarization to the protected metal to reduce or prevent metal corrosion. Generally, two schemes can be adopted to achieve this

1. Impressed current cathodic protection method

Impressed current cathodic protection uses an applied current to make the entire surface of the protected metal structure a cathode. When applying impressed current cathodic protection to metal equipment, connect a metal wire to the negative electrode of an applied power source and connect the other auxiliary anode to the positive electrode of the power source. At this time, the current flowing through the auxiliary anode mainly focuses on the cathodic protection of the metal after flowing through the electrolyte solution, causing cathodic polarization of the metal. The current flows back to the power supply through the cathode, thereby reducing the total potential of the metal. If the applied protective current is large enough, the original anode on the protected structure will no longer dissolve. At this time, only cathodic reduction reactions will occur on the metal surface, and additional protection is required to achieve complete protection. The selection of cathode materials is continuously developed and improved according to different usage conditions.

MMO coated titanium anodes have the advantages of using titanium as the substrate and coated with platinum group metal oxides with high catalytic activity. They have good electrical conductivity and low surface output resistance, are not subject to medium erosion, and are easy to process. It can be adapted to different environments, such as soil, pipelines, and other media.

2. Sacrificial anode protection method

Sacrificial anode protection method is a method to prevent metal corrosion, which means that a metal with a strong reducibility is used as a protective electrode and connected to the protected metal to form a primary battery. The metal with a strong reducibility will be consumed as a negative electrode for oxidation reaction, and the protected metal can be used as a positive electrode to avoid corrosion