Research and application of anode protecting cathode technology

Anode protection has many unique advantages.

Anodic protection is developed successfully on the basis of kinetics of electrode process, and it is difficult to discuss it without electrochemical theory. Compared with many corrosion prevention technologies, anodic protection is a kind of erosion control technology developed late, it is also a more economical and efficient effective anticorrosion technology. In short, anodic protection is a kind of anticorrosion technology which forms a protective passivation film on the metal surface by applying anodic current to the protected structure, so that the metal is in a blunt state and the metal can be effectively corroded. Anodic protection and cathodic protection are based on different scientific principles, but both belong to electrochemical protection methods. But in a broad sense, there are four ways to realize anode protection:

Compared with other erosion control technologies, anode protection has been applied to a relatively low degree. The investment cost of anode protection is usually about 2% of the equipment to be protected.

Research and application of anode protection technology

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An external power source is used for anodic polarization, which is commonly used as anodic protection.

Most metal materials exposed to electrolytes can be protected from erosion by electrochemical, cathodic, or anodic methods. This is mainly limited by the metal/medium systems available for anodic protection.

The research and application of anodic protection technology in our hospital are mainly used in the equipment for storing and treating sulfuric acid. Generally speaking, the investment of anode protection is slightly higher than that of cathode, but because the cost of the protected equipment itself is more expensive, compared with the investment proportion is not large. The smooth flow of the protective current applied to the metal/solution medium is often the dissolution current of the protected metal in the blunt state. One of the most successful practices of anodic protection technology is that anodic protection heat exchangers used to cool sulphuric acid manufacturing equipment have been sold in large numbers on the international market. It can therefore be assumed that anodic protection not only provides protection against erosion, but is also a direct method of monitoring the erosion rate of the protected system. Which protection method is more suitable depends on the electrochemical characteristics of the metal/environmental medium erosion system. At present, the most common application of anodic protection is to protect the steel used in sulphuric acid storage containers. These heat exchangers sold are all installed with anode protection systems, and thus have a significant market advantage, that is, it can be made of inexpensive common materials, not only to meet the requirements of application function, but also significantly reduce the cost of equipment.

Protector method

Anode modification of alloy

An oxidizer is added to the solution

Anodic protection is a kind of electrochemistry technology that can achieve the non-obtuse and non-passivation state by applying anodic current to the metal to make the metal potential move forward. In addition, if the protection system is not properly controlled, it may accelerate the erosion of equipment, which is a completely preventable but potentially latent threat.