Abstract
The corrosion behavior of steels in oxygen-containing water is considered. It depends on the oxygen concentration, water flow velocity, temperature, the presence of corrosive impurities, and the physico-chemical state of the metal surface. Insignificant changes in the parameters listed above favor the transition of steel into the active state. Under the conditions of neutral oxygen water operation (NOWO), the preliminary oxidation of steels allows one to make their protection more effective in several cases, namely, in an initial service period of the power plant, when the temperature of water heat carrier decreases; for heat carriers of lower quality; and for aqueous heat carriers with lowered oxygen concentration limits. Under adverse conditions of NOWO (during shut-downs of power units), potassium (sodium) nitrite should be introduced in place of oxygen.
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