The destruction of chromium oxides on the surface of 12Kh18N10T steel by concentrated ozone at different temperatures is investigated. The optimal temperature of the process in water is found to be 95°C. The oxidation time of the surface layer of chromium oxides is 5-10 min. Subsequent ozone treatment of a steel surface for a 20-fold longer time did not show any substantive destruction of the surface of corrosionresistant steel. Ozone diffusion through the surface of a bubble to the metal surface plays a decisive role in the oxidation of chromium.The accumulation of radioactive deposits, an increase of radiation fields, formation of a substantial amount of radioactive wastes, and high dose expenditures during upgrading, diagnostics, and repair work have made the development of an effective technology for decontaminating equipment being serviced at a nuclear power plant as well as equipment which has been taken out of operation a topical issue. In addition, it is necessary to take account of the accumulation on nuclear power plant sites of substantial amounts of decommissioned equipment made of high-quality steel which is unsalvageable because of radioactive contamination.At the present time, oxidizers (potassium permanganate, nitric acid, hydrogen peroxide, and other compounds) and complexing agents (oxalic acid and other compounds) are used for decontamination of primary-loop equipment of a nuclear power plant. Substantial amounts of wastes are produced because of the high concentration of the reagents, the multistage nature of the process, the need for several treatment cycles to attain the required effectiveness in using conventional technologies. These drawbacks make it necessary to search for better technologies. An example of such a technology is using ozone as an oxidizer -ozone decomposes into oxygen, as a result of which water discharges do not become contaminated with products of decomposition. A variant of decontamination by ozone of the surfaces of heat-exchangers in the primary loops of reactors is described in [1,2].The present work studies the interaction of concentrated ozone with chromium oxides, which are formed on the surface of 12Kh18N10T corrosion-resistant steel during the operation of a heat-exchanger. A capillary-type ozonizer with capacity 10 g/h ozone has been developed at the Ozone Technologies Laboratory as a source of concentrated ozone. The ozone concentration in the ozone-oxygen mixture was 200 mg/dm 3 . The mixture was fed into the reactor at rates ranging from 1 to
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