Control of thermal conditions as a method of protecting iron against local dissolution

• S.A. Kaluzhina¹, N.G. Nafikova¹ and M.Yu. Sanina²

¹ Federal State Budgetary Educational Institution of Higher Professional Education Voronezh State University, 1 Universitetskaya Square, Voronezh, 394006, Russian Federation
² Federal State Budgetary Educational Institution of Higher Professional Education Voronezh State Pedagogical University, 86 Lenina Street, Voronezh, 394043, Russian Federation

Abstract: Using a model setup reproducing various operation conditions of heat transfer equipment, the temperature conditions at the metal/solution interface that may inhibit the local violation of passive iron in soft water in the presence of Cl⁻, Br⁻, I⁻, SO4^2-, and NO3^- anions have been determined. It has been demonstrated that the presence of a positive heat flow directed from the solid to the liquid phase protects the metal from local damage in all the systems studied, in contrast to the conditions of thermal equilibrium where a similar effect can be observed only at a certain temperature of the metal surface.

Keywords: iron, passivity, pitting, temperature, heat transfer, inhibitor

Int. J. Corros. Scale Inhib., 2016, 5, no. 4, 367–375 PDF (666 K)
doi: 10.17675/2305-6894-2016-5-4-7

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