Why Should You Choose Cathodic Protection Technology?

What benefits does cathodic protection bring? Let's listen to the detailed introduction of industry experts.

Principle of Cathodic Protection Technology

Cathodic protection technology is a type of electrochemical protection method. Its principle is to apply an impressed current to the surface of a corroded metal structure, making the protected structure act as the cathode. This process inhibits the migration of electrons that cause corrosion and effectively prevents or reduces the occurrence of corrosion.

The surface of a metallic material exposed to an electrolyte contains numerous microscopic anode and cathode sites. Experts from cathodic protection manufacturing companies point out that when the electronegativity of the anode is stronger than that of the cathode, a potential difference occurs, leading to corrosion.

Function and Purpose

The main purpose of cathodic protection is to minimize the potential difference between the anode and cathode to an insignificant level. This reduction in potential difference occurs due to the polarization of the cathode, which can be analyzed and adjusted based on Ohm’s law. In practical terms, cathodic protection can be achieved by applying an impressed current directly to the corroded surface of the metal structure.

Formation of Corrosive Batteries

The formation of corrosive cells, or “corrosive batteries,” is primarily caused by the adsorption of moisture from the air onto the metal surface, forming a thin water film. Gases such as CO and others dissolve in this water film to form an electrolyte solution. Industrial steel, being an alloy, contains iron, graphite, cementite, and other metallic impurities — most of which are less active than iron.

In this electrochemical process, the iron acts as the anode, while impurities act as the cathode. Because the iron is in close contact with these impurities, corrosion continues over time. The corrosion rate of a metal depends on several factors, including the grain structure of the metal, alloy composition, manufacturing temperature, and any surface deformation that occurs during processing.

Electrochemical Reactions in Corrosion

In most environments, when metal is placed in water or a humid atmosphere, micro-cells form on its surface. These are often referred to as “corrosive batteries,” with electrodes functioning as anodes and cathodes. On the anode, oxidation reactions occur causing metal dissolution, while on the cathode, reduction reactions take place primarily to facilitate electron transfer.

Industry Application and Product Performance

The magnesium anode products developed by Suzhou Bogao Sacrificial Anode Manufacturing Co., Ltd. are particularly outstanding in terms of performance and practical effect. The company also has extensive experience in the professional research, development, and production of various sacrificial anodes, especially zinc blocks and zinc anode products.

The company’s high-quality products demonstrate remarkable performance and reliability in industrial anti-corrosion applications, earning an excellent reputation within the industry. For this reason, Suzhou Bogao has become one of the most trusted suppliers of sacrificial anode products in the region.