caa a22 4500 445844299 CHVBK 20180317145354.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s11085-011-9247-5 doi (NATIONALLICENCE)springer-10.1007/s11085-011-9247-5 Electrochemical Impedance Study of Hot Corrosion of the Mo-Rich Ni3Al-Base Alloy IC6 at 750-800°C Beneath Solid Na2SO4 Deposits [Elektronische Daten] [C. Zeng, Z. Feng, Y. Liu] A two-electrode probe was used for electrochemical impedance studies of hot corrosion kinetics of molybdenum-containing Ni3Al-base alloy IC6 covered with a solid Na2SO4 film at 750 and 800°C in air. The alloy was subject to catastrophic corrosion at both temperatures, forming a thick porous oxide layer, as a result of the formation of Na2MoO4-MoO3-Na2SO4 melt. The experimental temperature affected the formation of the melt, the ionic conduction of the corrosion layer, and thus the impedance characteristics. For the corrosion at 800°C the Nyquist plots were composed of two capacitive loops at high-mid frequency and a line at low frequency indicating a diffusion-controlled reaction. At 750°C, however, the plots consisted of a single capacitive loop in the initial stage, followed by the same impedance features as at 800°C. Two equivalent circuits were proposed to fit the impedance spectra at the two temperatures. Based on the precise measurements of diffusion impedance, the diffusion flux of oxygen through the salt layer was calculated, and the main reduction reaction was also discussed. Springer Science+Business Media, LLC, 2011 Intermetallic alloy IC6 nationallicence Na2SO4 deposits nationallicence Hot corrosion nationallicence Electrochemical impedance spectroscopy nationallicence Zeng C. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut Feng Z. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut Liu Y. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut Oxidation of Metals Springer-Verlag 76/1-2(2011-08-01), 83-92 0030-770X 76:1-2<83 2011 76 11085 https://doi.org/10.1007/s11085-011-9247-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-011-9247-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zeng C. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut NATIONALLICENCE 700 1- Feng Z. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut NATIONALLICENCE 700 1- Liu Y. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016, Shenyang, China aut NATIONALLICENCE 773 0- Oxidation of Metals Springer-Verlag 76/1-2(2011-08-01), 83-92 0030-770X 76:1-2<83 2011 76 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer