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Cathodic reduction of hydrogen on low-carbon steel in solutions of mineral acids containing nitrogen-containing organic compounds

The effect of corrosion inhibitors, namely a quaternary ammonium salt (Catamine AB) and 3-substituted 1,2,4-triazole (IFKhAN-92), on the corrosion and hydrogen charging of 08kp low-carbon steel and 70S2KhA high-strength steel in H 2 SO 4 and HCl solutions has been studied. Both inhibitors efficiently inhibit the corrosion and hydrogen charging of these steels. It was found that the addition of Catamine AB and IFKhAN-92 significantly inhibits the hydrogen evolution in H 2 SO 4 and HCl solutions on cathodically polarized low-carbon steel 08kp. These compounds slow down both partial reactions of this process on steel, i.e ., hydrogen molization and its incorporation into the metal bulk, in a wide range of cathodic potentials. IFKhAN-92 provides the strongest inhibition of these partial reactions. Partial or total prevention of the hydrogen charging of steels by addition of nitrogen-containing compounds during corrosion in H 2 SO 4 and HCl solutions is largely due to a decrease in the rate of hydrogen penetration into the metals by these compounds. Analysis of experimental data on the protection of steels in acid solutions with nitrogen-containing compounds allowed us to conclude that industrial application of IFKhAN-92 as a corrosion inhibitor of steels in these very corrosive environments is a promising approach. It is important that this corrosion inhibitor slows down the corrosion and hydrogen charging of various steels in H 2 SO 4 and HCl solutions that are industrially significant acid environments.