Corrosion inhibitor definition

A type of chemical that can prevent or slow the corrosion of water to metal materials or equipment after being added to water in an appropriate concentration and form, has the advantages of good effect, low dosage, and convenient use. There are many types and varieties of corrosion inhibitors. According to the types of compounds, they can be classified into inorganic corrosion inhibitors and organic corrosion inhibitors. The reaction inhibited by the reaction is an anode reaction, a cathodic reaction or both, and can be classified into an anode type corrosion inhibitor, a cathode type corrosion inhibitor or a mixed type corrosion inhibitor. The corrosion inhibitor can also be classified into a passivation film type, a precipitation film type, an adsorption film type, and the like according to a mechanism of forming a protective film on the metal surface. Passivation film type corrosion inhibitors commonly used in water treatment such as chromate, nitrite, molybdate, etc.; commonly used precipitation film type corrosion inhibitors include polymeric phosphates, zinc salts, etc.; Etchants such as organic amines.