Corrosion inhibitors for small-scale heat-supply systems

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 µ g/dm 3 . Experiments performed in a special setup for polarization measurements showed that, at an oxygen concentration of 600 µ g/dm 3 , a decrease in the general internal corrosion rate can be achieved using IOMS-1 and PAF-13A inhibitors at a concentration of 4 − 5 mg/dm 3 , or a zinc complex of oxyethylidenediphosphonic acid at 25 mg/dm 3 .

Innovative technology for reducing the rate of sediment formation in the power plants channels

“…The experimental tube is shown in Figure 3. Since the material of the tubes can also have a chemical effect on the sediment formation, some tubes were made of 1x18h10 stainless steel, and some of the Lo-70 brass [4]. Two tubes were smooth, and five had annular diaphragms.…”

Effect of the anionic composition of acidic solutions containing Fe(III) on the protection of low-carbon steel by a triazole inhibitor

“…The dissolution of steels in acid solutions containing Fe(III) cations occurs not only due to the reaction of iron with an acid: It was noted in [3] that in HCl solutions with high FeCl 3 content, steel corrosion predominantly occurs due to oxidation of the metal by Fe(III) cations, which may result in almost complete suppression of hydrogen evolution from the reaction of steel with HCl.…”