High-temperature inhibitors of stainless steel corrosion in hydrochloric 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, Leninsky pr. 31, Moscow, 119071 Russian Federation

Abstract: The corrosion of chromium-nickel steel 08Kh18N10T in 2 M HCl has been studied in a broad temperature range, t = 0–160°C. Under these conditions, the metal corrosion is enhanced with an increase in temperature to reach 5.0 kg/(m²·h) at 160°C. It has been shown that the IFKhAN-92 inhibitor (a substituted triazole) and its formulation with urotropine in a molar ratio of 1:4 protect this steel in 2 M HCl at temperatures up to 120°C, inclusive. The three-component 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 160°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 HCl at temperatures up to 160°C, inclusive.

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

Int. J. Corros. Scale Inhib., 2017, 6, no. 2, 180–195 PDF (1 502 K)
doi: 10.17675/2305-6894-2017-6-2-7

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