INFLUENCE OF CO AND CO2 LEVELS IN IMPURE HELIUM ON THE HIGH TEMPERATURE CORROSION BEHAVIOR OF INCONEL 617

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<p>The helium coolant in the primary circuit of the high temperature gas-cooled reactor (HTGR) contains traces of impurities, which have an adverse effect on the structural metallic materials at elevated temperatures. Chromium-rich nickel-based alloy has been a representative of superalloys with outstanding performance, and, in this study, Inconel 617 was selected as the experimental alloy. The high temperature corrosions of Inconel 617 under the four impure helium were carried out, and different gas phase data and corrosion behaviors were found, that is, the content of CO would influence the formation of the oxide layer, causing the loss of scale at low CO content, even the high purity level. On this basis, a corrosion diagram between the temperature and CO content was proposed to confirm whether the destruction reaction occurred, which gave the critical partial pressure of CO (PCO*). Furthermore, due to the high free enthalpy of the reaction between CO2 and Cr, trace CO2 was introduced into the impure helium, as a new method to overcome the damage of scale destruction. In this study, the focus was made on the investigation of the influence of CO and CO2 levels on the corrosion phenomena and mechanism, and the results of this study will provide some guidance for the engineering practice of HTGR.</p>

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