Passivating Film As a Structured Solid Solution of the Alloy Oxide Particles. The Structuring Effects (Ordering and Stratifying)

Yu. V. Alekseev^{a, b} and I. Yu. Alekseev^c

^a Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 103064 Russia; Institute of High Temperatures,
^bRussian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412 Russia

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^c Research Institute of Precision Instruments, ul. Dekabristov 51, Moscow, 127490 Russia

Received August 23, 2005

Abstract — The investigations deal with the passivating films that can be modeled as a solid solution of the alloy oxides. Models of unstructured (regular) solutions enable one to explain the dependence of the dissolution rate of a Fe–Cr alloy at a chromium concentration higher than 0.2 atomic parts. Irregular solution models, which take into account the alloy structuring due to the interactions between its components is applicable to the compositions below a chromium content of 0.2. The physical effects predicted by the model are studied, namely the higher dissolution rate of the alloy compared to the dissolution rate of the most active component, the different alloying mechanisms at the different kinds of interactions between the components, as well as the kinetic metastability and its role in the initiation of pitting by some admixtures.

PACS numbers: 81.65.Rv; 82.45.Bd

DOI: 10.1134/S0033173207040029