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

• Ya.G. Avdeev, T.A. Nenasheva, L.V. Frolova, A.I. Marshakov and Yu.I. Kuznetsov

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, 119071 Moscow, Russian Federation

Abstract: 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 H₂SO₄ 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 H2SO4 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 H₂SO₄ 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 H₂SO₄ and HCl solutions that are industrially significant acid environments.

Keywords: acid corrosion, corrosion inhibitors, triazole, low carbon steel, high strength steel, hydrogen charging of steel, hydrogen permeation, sulfuric acid, hydrochloric acid

Int. J. Corros. Scale Inhib., 2021, 10, no. 1, 262-283 PDF (733 K)
doi: 10.17675/2305-6894-2021-10-1-15

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