I. V. Oryshich

High-temperature chloride corrosion of industrial ЭИ827 and BЖ-85 nickel alloys

High-temperature chloride corrosion (ChC) of ЭИ827 and BЖ-85 nickel alloys was investigated in a temperature range of 773 to 1173 K and exposure time of 1 to 50 h in the MgCl2-KCl-NaCl ternary eutectic and oxidation in air (at 873 to 1273 K for 500 h). The ChC is intergranular, intensely develops starting from a temperature of 973 K, and results in softening due to the strong extraction of chromium and aluminum from the base alloy. Other things being equal, the ChC rate exceeds the oxidation rate in air by two to three orders of magnitude.

Thermal Resistance of Low-Alloyed Chromium Alloys

The oxidation kinetics of low-alloyed ВХ-2К and ВХ1-17А chromium alloys is investigated at a temperature from 1273 to 1673 K for 1000 h. It is shown that even at a temperature from 1473 to 1673 K the heat resistance of these alloys is higher than that of the ЭП648 nickel-containing alloy at a temperature from 1273 to 1373 K. This allows to recommend the alloys as heat-resistant materials operating at a temperature up to 1573 K.

Distinctive features of corrosion damage to low-alloy chromium subjected to high-temperature salt corrosion

We study the influence of alloying elements (La, V, Al, Si) on the mechanism of interaction of chromium with NaCl and Na2SO4 salt melts at a temperature of 900°C. Alloying elements form chemically stable scales with enhanced adhesive properties and reduce the rate of salt corrosion largely due to a decrease in the share of grain-boundary damage.