The role of Deoxygenation and bactericidal corrosion inhibitor

Deoxygenation and bactericidal corrosion inhibitor is a multifunctional chemical agent mainly used to control the corrosion, dissolved oxygen, and microbial growth of metal systems. It is commonly used in industrial water treatment such as circulating cooling water systems, boiler water treatment, and petroleum extraction. Its function is based on the synergistic effect of three core functions: deoxygenation, sterilization, and corrosion inhibition.

Deoxygenation function: This function removes dissolved oxygen from water by adding reducing chemicals such as sodium sulfite or hydrazine, thereby inhibiting oxygen reduction reactions and slowing down the electrochemical corrosion of metals. For example, in boiler feedwater treatment, Deoxygenation and bactericidal corrosion inhibitor react with oxygen to generate stable compounds, reducing oxygen concentration and effectively preventing the formation of iron oxides.

Sterilization effect: It kills corrosive microorganisms (such as sulfate reducing bacteria, iron bacteria, and algae) in water through oxidation or non oxidation mechanisms, preventing biofouling and microbial induced corrosion. Commonly used disinfectants such as chlorine gas, quaternary ammonium salts, or bromides can damage the structure of microbial cells, reduce corrosion products, and minimize the risk of corrosion under scale.
Corrosion inhibition effect: Deoxygenation and bactericidal corrosion inhibitor are added in trace amounts (usually 0.1% to 1%) to protect metal surfaces through various mechanisms, mainly including:
1) Film formation theory: A dense protective film, such as an oxide film, precipitation film, or adsorption film, is formed on the metal surface to isolate the metal from the corrosive medium.
2) Electrochemical mechanism: Inhibits anodic oxidation or cathodic reduction reactions, increases electrode overpotential, and reduces corrosion rate.
3) Hybrid corrosion inhibitor: organic compounds containing nitrogen and sulfur that can adsorb simultaneously in both the anode and cathode regions, enhancing the protective effect.
For example, benzotriazole forms an adsorption film on copper surface, while phosphate can form a insoluble salt precipitation film.
Synergistic effects and applications: Deoxygenation, sterilization, and corrosion inhibition functions promote each other. For example, deoxidation reduces oxygen corrosion, sterilization prevents microbial fouling, and deoxidation sterilization and corrosion inhibitors directly protect metal substrates. This combination can significantly extend equipment life and improve system efficiency. In practical applications, it is necessary to optimize the formulation of drugs based on the medium environment (such as pH value, temperature) to avoid drug conflicts or environmental risks. The current research trend focuses on developing environmentally friendly compound drugs.
Precautions for the use of Deoxygenation and bactericidal corrosion inhibitor
Concentration control: The dosage should be adjusted according to the water quality and equipment type to avoid excess or insufficient.
Environmental adaptability: It is necessary to consider factors such as pH value and temperature of the medium to select the appropriate type of corrosion inhibitor.
Safe operation: Some corrosion inhibitors may be toxic or corrosive, and protective equipment should be worn and safety regulations followed.
Deoxygenation and bactericidal corrosion inhibitor is a multifunctional industrial chemical agent mainly used to remove dissolved oxygen in water, kill microorganisms, and effectively inhibit the corrosion of metal equipment, thereby extending equipment life and ensuring safe system operation.