Hot corrosion behavior of the Ni-based superalloy M38G covered with a film of fused 0.9Na(2)SO(4)-0.1K(2)SO(4)(mol%) at 1173K in air for 1500h has been examined by using electrochemical impedance technique. The impedance spectra of the alloy presented the characteristics of two capacitive loops during experimental periods of time, but the impedance tended to decrease with time. The alloy could form Cr-rich oxide scale, which, however, degraded gradually mainly due to fluxing in the melt. The low-frequency impedance spectra represented the responses from the scale. Thus an equivalent circuit of oxide capacitance in series with electrochemical double-layer capacitance was proposed to describe the hot corrosion of the alloy, and the electrochemical parameters in the equivalent circuit were calculated. Hot corrosion mechanism of the alloy was also discussed in accordance with the changes of some parameters.
部门归属
nanchang inst aeronaut technol, nanchang 330034, peoples r china. chinese acad sci, met res inst, state key lab corros & protect, shenyang 110016, peoples r china.;zeng, cl (reprint author), nanchang inst aeronaut technol, 173 shanghai rd, nanchang 330034, peoples r china;clzeng@imr.ac.cn
C. L. Zeng,J. Li. Long-term hot corrosion behavior of Ni-based superalloy M38G using electrochemical impedance spectroscopy[J]. High Temperature Materials and Processes,2006,25(4):187-195.
APA
C. L. Zeng,&J. Li.(2006).Long-term hot corrosion behavior of Ni-based superalloy M38G using electrochemical impedance spectroscopy.High Temperature Materials and Processes,25(4),187-195.
MLA
C. L. Zeng,et al."Long-term hot corrosion behavior of Ni-based superalloy M38G using electrochemical impedance spectroscopy".High Temperature Materials and Processes 25.4(2006):187-195.
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