The difference between antiscalant and corrosion inhibitor

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by：BOQU 2023-04-11

Scale inhibitor: mainly based on the principles of lattice distortion, dispersion and chelation, and solubilization. Functional groups with empty coordination bonds can combine with scale-forming ions in water. The water washes away. Or the scale-forming ions in water exist in a large concentration in water, and even if the scale-forming ions have a high concentration, they will not be precipitated. The principle of dispersion is to use the repulsion of charged ions so that the finished substances cannot gather and co-precipitate. Scale inhibitors mainly include organic phosphonates, polycarboxylic acids, many types, and natural products, such as lignin. Corrosion inhibitor: It mainly uses the special functional groups in the agent to form a precipitation film with metal ions in the water to prevent the metal surface from contacting oxygen and mainly play a role in depolarization. Zinc salt is a typical corrosion inhibitor that absorbs and forms a film. Of course, depending on the mechanism of corrosion inhibition of corrosion inhibitors, there are many types of corrosion inhibitors. What I just mentioned are the more commonly used organic phosphonate adsorption film corrosion inhibitors and molybdate corrosion inhibitors, which are mainly used to passivate the metal surface, and are generally used in closed circulating cooling water.