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02526 PROCESSES OCCURRING DURING THE ACCELERATED OXIDATION AND HYDRIDING OF ZIRCONIUM ALLOYS

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Product Number: 51300-02526-SG
ISBN: 02526 2002 CP
Author: I. PARVAN, M. RADULESCU, L.VELCIU, and C. ANGHEL
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This paper presents the accelerated oxidation and hydriding processes of zirconium alloys (Zircaloy-4 and Zr-2.5%Nb) in connection with testing temperature.The corrosion tests have been performed by autoclaving in steam at 400-600°C and 10 - 11MPa. The samples used in the oxidation tests were cut from Zircaloy-4 sheaths and Zr-2.5%Nb pressure tube in the same metallurgical state as the sheaths and pressure robes of the CANDU-Reactor. On the basis of determinations of weight gains, were established the corrosion kinetics and the constant values of corrosion kinetics, which were compared with those obtained 310°C and 350°C.The thickness of oxides determined on metallographic cross sections were in accordance with the thickness resultant from weight gains.The aspects of oxides and hydrides formed at different temperatures was revealed through metallographic microscopy. Through scanning electron microscopy were examined the oxidated surfaces and metal/oxide interfaces of tested samples. The electrochemical impedance spectroscopy determinations obtained on oxides formed at 400, 500 and 600°C revealed differences between oxides depending on formation temperature.The experimental data allowed to correlate the process of oxidation and hydriding of Zircaloy-4 and Zr-2.5%Nb alloy with the test temperature. Keywords: zirconium alloys, porous oxides, nodular oxidation, corrosion kinetics, impedance spectra, accelerated hydriding.
This paper presents the accelerated oxidation and hydriding processes of zirconium alloys (Zircaloy-4 and Zr-2.5%Nb) in connection with testing temperature.The corrosion tests have been performed by autoclaving in steam at 400-600°C and 10 - 11MPa. The samples used in the oxidation tests were cut from Zircaloy-4 sheaths and Zr-2.5%Nb pressure tube in the same metallurgical state as the sheaths and pressure robes of the CANDU-Reactor. On the basis of determinations of weight gains, were established the corrosion kinetics and the constant values of corrosion kinetics, which were compared with those obtained 310°C and 350°C.The thickness of oxides determined on metallographic cross sections were in accordance with the thickness resultant from weight gains.The aspects of oxides and hydrides formed at different temperatures was revealed through metallographic microscopy. Through scanning electron microscopy were examined the oxidated surfaces and metal/oxide interfaces of tested samples. The electrochemical impedance spectroscopy determinations obtained on oxides formed at 400, 500 and 600°C revealed differences between oxides depending on formation temperature.The experimental data allowed to correlate the process of oxidation and hydriding of Zircaloy-4 and Zr-2.5%Nb alloy with the test temperature. Keywords: zirconium alloys, porous oxides, nodular oxidation, corrosion kinetics, impedance spectra, accelerated hydriding.
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