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The water vapor oxidation behaviors of Fe and Fe–Cr alloys under isothermal and heat–cyclic conditions in an Ar–12 vol% H2O atmosphere were investigated by measuring both the hydrogen partial pressure using a hydrogen sensor and the oxidizing current of hydrogen using an oxygen pump–sensor, which were installed at the back section of the reactor. First, the performance of the oxygen pump–sensor was evaluated using Ar–1000 ppmH2 gas. As a result, it was found that the hydrogen concentration in the gas can be accurately measured by the oxidizing current of hydrogen. The isothermal oxidation test at 1173 K showed that the mass gain of the Fe–20 mass% Cr alloy was the highest, while the mass gain of the Fe–30 mass% Cr alloy was the lowest. For the Fe–20 mass% Cr alloy showing the highest mass gain, a rapid increase in the oxidation rate was observed during the oxidation test. The cyclic oxidation test indicated that the Fe and Fe–30 mass% Cr alloy had a lower oxidation rate in the second cycle than in the first cycle. On the contrary, for the Fe–20 mass% Cr alloy, the oxidation rate was higher in the second cycle than in the first cycle. For the Fe–30 mass% Cr alloy, the oxidation rate and mass gain during the cyclic oxidation test were low. The oxidation rates measured by the hydrogen sensor and the oxygen pump–sensor were showed the same behavior during the isothermal oxidation test. Since the oxidation rate is measured in situ using the hydrogen sensor and oxygen pump–sensor methods, it was clarified that both methods are effective for studying the water vapor oxidation behavior. [doi:10.2320/jinstmet.JB201701]

Investigation of High Temperature Oxidation in Steam for Fe-Cr Alloy Using the Combination of a Hydrogen Sensor and an Oxygen Pump-Sensor