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Tunnel scanning microscopy and spectroscopy in studying Fe-Cr stainless steels

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Abstract

Scanning tunnel microscopy (STM) and scanning tunnel spectroscopy (STS) are used in studying highly pure iron and chromium and Fe-x%Cr (2.4 ≤ x ≤ 60 wt %) alloys at the air boundary, as well as some of the alloys in 0.01 N H2SO4. The obtained probability coefficients (α) of the electron tunnel transfer from a specimen to the needle and the slopes (β) of the logarithmic U t /log (I t ) dependences as functions of the chromium content in Fe-Cr alloys confirm the critical compositions of the alloys containing ∼6.5 and 10–13% chromium, which is in accord with the results of the steady-state and transient electrochemical measurements. A correlation between these critical compositions of the alloys and sharp changes in the histograms of α and β values is observed. Pronounced extreme properties of the Fe-25.2% Cr alloy surface, which corresponds to the inclusion of Cr atoms in tetrahedral voids of the alloy crystal lattice, are noticed.

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Authors and Affiliations

  1. Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064, Russia

    E. V. Trofimova, E. V. Kasatkin & I. I. Reformatskaya

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  1. E. V. Trofimova
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  2. E. V. Kasatkin
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  3. I. I. Reformatskaya
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Additional information

Original Russian Text © E.V. Trofimova, E.V. Kasatkin, I.I. Reformatskaya, 2006, published in Zashchita Metallov, 2006, Vol. 42, No. 3, pp. 245–255.

The work was financially supported by the Russian Foundation for Basic Research, project no. 04-03-32337.

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Trofimova, E.V., Kasatkin, E.V. & Reformatskaya, I.I. Tunnel scanning microscopy and spectroscopy in studying Fe-Cr stainless steels. Prot Met 42, 227–237 (2006). https://doi.org/10.1134/S0033173206030040

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