Effect of pyrophosphate-polyphosphate inhibitors on the processes of corrosion and salt deposition in aqueous systems

The efficiency and mechanisms of the protective action of a new modification of the KORSOL-1M inhibitor are studied for 20 and Kh 18N10T steels in water with different values of hardness at different temperatures. It is shown that, as a result of the formation of a quasiamorphous film, the inhibiting composition suppresses both the cathode and anode reactions and, therefore, is characterized by the complex mechanism of protection. At elevated temperatures, the protective properties of the inhibitor become somewhat weaker but remain satisfactory for practical applications. In distilled water, the rate of corrosion of 20 steel increases in the presence of the composition. At the same time, for Kh 18N10T steel, the rate of corrosion decreases due to the formation of the passivating film. In water with medium hardness, the protective properties of the inhibitor for stainless steel become weaker. The action of inhibiting composition is characterized by the presence of the aftereffect.