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Inhibitor Protection of Steels in Solutions of Sulfuric Acid under High-Temperature Corrosion (up to 200°C)

  • CORROSION INHIBITORS
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Abstract

This article analyzes corrosion of 08Kh18N10T chrome nickel steel in 2 M H2SO4 in wide temperature range t = 0–200°C. Under such conditions, corrosion of metal increases with increase in t and at 200°C reaches 9.7 kg/(m2 h). It is demonstrated that the composition of substituted triazole, IFKhAN-92 inhibitor and KI (mole ratio 1 : 1), makes it possible to protect this steel in 2 M H2SO4 at temperatures up to 140°C, inclusive. A three-component mixture of IFKhAN-92, KI, and hexamethylenetetramine (1 : 1 : 4), is more interesting in this regard, it efficiently inhibits corrosion at t up to 180°C, inclusive, maintaining protection for at least 8 h. The same composition reliably protects low carbon steel, grade 20, in 2 M H2SO4 at temperatures up to 180°C, inclusive; moreover, metal corrosion is decelerated in time.

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ACKNOWLEDGMENTS

This work was supported by the Russian Foundation for Basic Research and the government of Kaluga oblast, project no. 14-43-03037.

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Correspondence to Ya. G. Avdeev.

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Translated by I. Moshkin

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Avdeev, Y.G., Kuznetsov, D.S. & Oleinik, S.V. Inhibitor Protection of Steels in Solutions of Sulfuric Acid under High-Temperature Corrosion (up to 200°C). Prot Met Phys Chem Surf 54, 1305–1311 (2018). https://doi.org/10.1134/S2070205118070067

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  • DOI: https://doi.org/10.1134/S2070205118070067

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