High-temperature inhibitors of stainless steel corrosion in sulfuric acid solutions

• Ya.G. Avdeev¹, D.S. Kuznetsov², M.V. Tyurina¹, S.V. Oleynik² and M.A. Chekulaev¹

¹ K.E. Tsiolkovsky Kaluga state university, Stepana Razina str. 26, Kaluga, 248023 Russian Federation
² A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The corrosion of chromium-nickel steel 08Kh18N10T in 2 M H2SO4 has been studied in a broad temperature range, t = 0–200°C. Under these conditions, the metal corrosion is enhanced with an increase in t to reach 9.7 kg/(m²·h) at 200°C. It has been shown that a formulation of IFKhAN-92 inhibitor (a substituted triazole) with KI in a molar ratio of 1 : 1 protects this steel in 2 M H2SO4 at temperatures up to 140°C, inclusive. The threecomponent mixture of IFKhAN-92, KI and urotropine (1:1:4) is more promising in this respect, as it efficiently inhibits corrosion at temperatures up to 180°C and allows the protective effect to be maintained for at least 8 h. This formulation also reliably protects low-carbon steel 20 in 2 M H2SO4 at temperatures up to 180°C, inclusive; what is more, corrosion slows down with time in the presence of this mixture.

Keywords: high-temperature acid corrosion, corrosion inhibitors, stainless steel, triazoles

Int. J. Corros. Scale Inhib., 2017, 6, no. 1, 47–58 PDF (1 251 K)
doi: 10.17675/2305-6894-2017-6-1-4

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