Corrosion Inhibitors for Small-Scale Heat-Supply Systems

Yu. V. Balaban-Irmenin and N. G. Fokina*

All-Russia Thermal Engineering Institute, Moscow, 109280 Russia

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Received March 29, 2007

Abstract — Stationary oxygen concentration in a closed heat-supply system, which is filled and replenished with nondeaerated water at a temperature of 20°C, has been calculated. The calculation takes into account the system surfaceto- volume ratio and the relative added makeup water volume fraction. In the case of a system using corrosion inhibitors, the stable oxygen concentration at a preset makeup rate falls within 400–800 g/dm³. Experiments performed in a special setup for polarization measurements showed that, at an oxygen concentration of 600 g/dm³, a decrease in the general internal corrosion rate can be achieved using IOMS-1 and PAF-13A inhibitors at a concentration of  45mg/dm³, or a zinc complex of oxyethylidenediphosphonic acid at 25 mg/dm³.