Corrosion inhibitors are substances that inhibit or slow down corrosive processes.
Corrosion is an electrochemical process caused by the difference in potential between the corrosive element and the electrolyte solution in which the element is immersed. In this case, a metal with a lower electrochemical potential is an anode on which oxidation takes place, as a result of which the ions of this metal are transferred to the solution. Corrosive factors include oxygen, peroxides, organic acids, carbon dioxide, as well as phenols and hydrogen sulphide.
Inhibitors have a protective function, preventing damage to elements made of metals and their alloys. The use of corrosion inhibitors helps to prevent or significantly reduce corrosion progress. Their function is to create a protective layer on the surface of the material by adsorption of the inhibitor molecules. The resulting thin film acts as a barrier to prevent damage to the material. In addition, the inhibitors ensure an appropriate pH level, limiting the progress of corrosion.
There are two types of corrosion inhibitors:
– anode – inhibiting reactions on the anode, otherwise known as passivation inhibitors. They react at the boundary between the corrosive material and the environment in which the material is located. They form a layer of oxides which protect the metal against migration to the environment.
– cathodic – blocking reactions on the cathode, otherwise known as precipitation inhibitors. They cause precipitation of water-insoluble hydroxide and carbonate sediments.
Substances that inhibit corrosion processes are mainly used in the metallurgical industry and in the production of industrial cleaning and washing preparations.
By continuing to use our website, you are agreeing to the placement of cookies or similar technologies on your device for functional, statistical and marketing purposes. You can modify or withdraw your consent at any time in your browser settings. Learn more