Nanostructure and Energy Properties of the Stainless Steel X18N10T Surface Studied by Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy. 2. Measurements at Different Potentials in HCl and H2SO4 Solutions.
Yu. M. Stryuchkova and E. V. Kasatkin
Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105054 Russia
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Received Fabruary 13 2008
Abstract — Stainless steel Kh18N10T is studied by electrochemical scanning tunneling microscopy (ESTM) and electrochemical scanning tunneling spectroscopy (ESTS) at the interface with solutions of 0.01 N HCl and 0.1 N H2SO4 at the controlled sample and tip potentials. The sample potential varied from –0.46 to +1.14 V in 0.01 N HCl and from –0.06 to +0.74 V (NHE) in 0.1 N H2SO4. It is shown that although in the studied acid solutions at the controlled potential the surface is smother than in air, this does not allow one to determine the extremal values of parameters 
, 
, and 
corresponding to individual properties of Fe, Cr, and Ni or their oxides. It is shown that compared to the steel nanorelief, the sample potential has a stronger effect on the electrophysical properties that determine the tunneling transfer of electrons.
, , and corresponding to individual properties of Fe, Cr, and Ni or their oxides. It is shown that compared to the steel nanorelief, the sample potential has a stronger effect on the electrophysical properties that determine the tunneling transfer of electrons.
PACS numbers: 68.37.Ef, 81.07.-b
DOI: 10.1134/S0033173208060088