On the Formation of Magnetite Coatings on Low-Carbon Steel in Ammonium Nitrate Solution*

D. B. Vershok^a, P. I. Misurkin^b, V. A. Timofeeva^b, A. B. Solov’eva^b,
Yu. I. Kuznetsov^a, and S. F. Timashev^c

^a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow

^b Semenov Institute of Physical Chemistry, Russian Academy of Sciences, Moscow

^c Karpov Scientific Research Physicochemical Institute, Moscow

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Received May 30, 2007

Abstract — Initial stages of the formation of magnetite coating (MC) on low-carbon steel in ammonium nitrate solution at a temperature of 98°C is studied by atomic force microscopy. Analyzing the results obtained by flicker–noise spectroscopy allows the degree of continuity and structuring of MC to be estimated. It is shown that the formation of magnetite nuclei in the course of direct electrochemical reaction may take place in the first minutes of oxidation; continuous coating is formed in10–15 min.