Inhibitory protection of low-carbon steel in solutions of hydrochloric, sulfuric, and phosphoric acids

• Ya.G. Avdeev¹, A.V. Panova¹, V.V. Al’brandt², K.L. Anfilov³, A.G. Berezhnaya⁴ and T.A. Vagramyan²

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² Mendeleev University of Chemical Technology, Russia, Moscow, Miusskaya sq., 9, 125047 Moscow, Russian Federation
³ Bauman Moscow State Technical University (Kaluga Branch), Bazhenov str. 2, 248000 Kaluga, Russian Federation
⁴ South Federal University, Bol’shaya Sadovaya str. 105/42, 344006 Rostov-on-Don, Russian Federation

Abstract: The possibility of inhibitor protection of 08PS steel in 2 M HCl, 2 M H₂SO₄ and 2 M H₃PO₄ in the temperature range t=25–95°C was studied. Commercial forms of industrially manufactured corrosion inhibitors of Invol-2 m. A, Invol-2 m. B, GREENCOR m. V, VNPP-2-V, VNPP-2-MV, and Catamin AB brands were studied as corrosion inhibitors at their content of 10 g/L in the corrosive environment. Significant inhibition of 08PS steel corrosion in 2 M HCl at t≤60°C is provided by the additives Catamin AB, Invol-2 m. B, and VNPP-2-V, while at t≤95°C, additives of GREENCOR m. V, Invol-2 m. A, and VNPP-2-MV inhibitors are efficient. In solutions of H₂SO₄ and H₃PO₄, the presence of these inhibitors alone often fails to provide a significant reduction in the corrosion rate of steel. To improve their efficiency in slowing down steel corrosion in H₂SO₄ and H₃PO₄ solutions, it is recommended to use the inhibitors studied in combination with 2 g/L NaCl or 0.2 g/L NH₄CNS. In H₂SO₄ solution at t ≤ 95°C, the GREENCOR m. V + NaCl, VNPP-2-V + NaCl, or GREENCOR m. V + NH4CNS combinations should be used to protect steel, while in H₃PO₄ solution, combinations of Catamin AB, Invol-2 m. B, GREENCOR m. V, and VNPP-2-MV with NH₄CNS are recommended.

Keywords: acid corrosion, low carbon steel, hydrochloric acid, sulfuric acid, phosphoric acid, corrosion inhibitors

Int. J. Corros. Scale Inhib., 2024, 13, no. 1, 508-525
doi: 10.17675/2305-6894-2024-13-1-25

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