The Effect of Silicon on Hyperfine Structure and CorrosionElectrochemical Behavior of FeCr Alloys

O. V. Kasparova,* Yu. V. Baldokhin,** and M. O. Anosova***

* Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 105064 Russia

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** Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991 Russia

*** Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119049 Russia

Received September 15, 2007

Abstract — The effect of silicon on the corrosion–electrochemical behavior of iron alloys containing 15, 20, and 25% chromium in a 1 N H₂SO₄ solution at room temperature is investigated. With the use of Mössbauer spectroscopy, the hyperfine magnetic and electronic structure of the alloys is studied. With the Normos program package for processing spectra, the distribution function of hyperfine magnetic fields P(H_ef), mean intensity of the effective magnetic field H_ef, isomeric shift , electric quadrupole splitting eq, and other parameters are calculated. Spectroscopic data are compared to the results of polarization measurements. A correlation between the hyperfine structure and electrochemical behavior of the alloys in various potential ranges is found.