On the Problem of Chromium Effect on the Passivability of FeCr Alloys

O. V. Kasparova^a*, Yu. V. Baldokhin^b, G. F. Potapova^a, and M. O. Anosova^c

^a Karpov Institute of Physical Chemistry, Vorontsovo pole 10, Moscow, 105064 Russia

^b Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991 Russia

^c Moscow Institute of Steel and Alloys State Technological University, Leninskii pr. 4, Moscow, 119049 Russia

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Received April 3, 2008

Abstract—The hyperfine magnetic and electronic structure of annealed iron alloys containing 9.0, 11.8, and 12.7% chromium is studied using of Mössbauer spectroscopy. Probability distribution functions of hyperfine magnetic fields P(H_eff), mean-square intensities of the effective magnetic field H_{eff, m-sq}, average isomer (chemical) shifts , and other spectral parameters are calculated with the use of computer modeling. Data from Möss-
bauer spectroscopy are compared to the results of polarization measurements in 1 N H₂SO₄ solution at room temperature in order to find the correlation between the electronic structure and the passivability of the alloys studied.

PACS: 76.80.+y; 82.45.Bb