Lavrova O.V., Legkikh A.Yu.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
The investigation of corrosion of structural steels in the coolant is one of the important factors in the justification of the safety of nuclear facilities. A feature of heavy liquid metal coolants carriers is their corrosive effect on structural steels. The justification of the corrosion resistance of steels is carried out mainly on the basis of steel samples experimental studies. Steel samples are tested at research facilities under conditions simulating the conditions of a nuclear reactors. At research of the steel durability in heavy liquid metal coolants the basic attention, as a rule, is given to the temperature factor and the dissolved oxygen concentration in the coolant concerning which experimental results for the same steel quality are systematized and kinetic dependences are under construction. However, one of the key factors affecting the physicochemical processes at the “coolant – steel” boundary is the oxidative potential of the coolant. The oxidative potential of the coolant affects the selectivity of the oxidation of steel components significantly, and, consequently, the corrosion process. In the present work the analysis of agency of oxygen potential of an environment on selectivity of oxidation of steel components, in particular, iron and chromium is made. The physical model of oxidation of the firm alloys, explaining considerable excess of streams of iron over streams of chromium from steels in heavy liquid metal coolants and the mechanism of transformation of magnetite in chromic spinel, and then in chromium oxide is offered.
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