Corrosion inhibitors can be classified into various types based on their chemical composition and mechanism of action. The following are some common types of corrosion inhibitors:
Passivation agent: Passivation agent protects metal surfaces from corrosion by forming a stable passivation film. This type of film is usually composed of metal oxides, hydroxides, or salts, such as chromates, phosphates, etc.
Binder: Binder can form chemical complexes with metal surfaces to prevent corrosion. They usually include organic acids (such as citric acid, acetic acid), amines and their salts, and other substances.
Zinc salts: Zinc salt corrosion inhibitors achieve corrosion inhibition by forming a zinc salt film on the metal surface. These films can provide a certain degree of physical and chemical protection, reducing metal corrosion.
Surfactants: Surfactants can form a physical adsorption layer on the surface of metals, preventing corrosive media from coming into contact with the metal, thereby protecting the metal from corrosion. For example, phosphate surfactants are often used to prevent metal corrosion in water.
Oxalate: Oxalate is a commonly used corrosion inhibitor that can form stable complexes with metals and prevent further corrosion. Oxalate has a good corrosion inhibition effect on metals such as iron, copper, and aluminum.
These are just one of the common types of corrosion inhibitors, and there are actually many other types of corrosion inhibitors, each with its own specific conditions and application scenarios. When selecting and using corrosion inhibitors, it is necessary to consider specific metal materials, corrosive media, environmental conditions, and follow corresponding operating and usage guidelines.