Electrochemical impedance study of corrosion of B-1900 alloy in the presence of a solid Na2SO4 and a liquid 25 wt.% NaCl–75 wt.% Na2SO4 film at 800 °C in air

Zeng, Chao; Zhang, T.

doi:10.1016/j.electacta.2003.10.029

Cited by 5 publications

(7 citation statements)

References 11 publications

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“…EIS has been widely used in the study of aqueous corrosion. Up to now some papers concerning application of EIS technique in the study of hot corrosion have also been published [9][10][11][12][13]. A two-electrode system seemed suitable for studying the hot-corrosion behavior in the presence of a thin salt film by using EIS [12,13].…”

Section: Introductionmentioning

confidence: 98%

Electrochemical-Impedance-Spectroscopy (EIS) Study of Corrosion of Steels 12CrMoV and SS304 Beneath a Molten ZnCl2–KCl Film at 400 °C in Air

Pan

Ren

et al. 2009

Oxid Met

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The corrosion resistance of 12CrMoV and SS304 steels in contact with a molten mixture of (55-45) mol.% ZnCl 2 -KCl, similar to that found in wasteincineration plants, has been examined in air at 400°C by the electrochemicalimpedance-spectroscopy (EIS) technique. The initial Nyquist plots of 12CrMoV showed a semicircle at high frequency and a line at low frequency indicating a diffusion-controlled reaction. At a later stage, the Nyquist plots are composed of a small semi-circle at high frequency, a line at medium frequency and a large semicircle at low frequency, similar to that shown by SS304 during the whole experimental test. The larger impedance of SS304 as compared to 12CrMoV may be attributed to the presence of Ni and to the higher Cr content of SS304. Equivalent circuits representing the features of the corrosion of 12CrMoV and SS304 are proposed to fit the corresponding impedance spectra, and the electrochemical parameters in the equivalent circuits are calculated.

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Section: Introductionmentioning

confidence: 98%

Electrochemical-Impedance-Spectroscopy (EIS) Study of Corrosion of Steels 12CrMoV and SS304 Beneath a Molten ZnCl2–KCl Film at 400 °C in Air

Pan

Ren

et al. 2009

Oxid Met

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“…Moreover, this makes it possible the in situ monitoring of the hot corrosion process of materials in service conditions. Because of the difficulties in the establishing of electrochemical measurements at elevated temperatures in the presence of a thin fused salt film, the progresses have been very limited so far [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, EIS was introduced to study hot corrosion in the 1980s. But only limited progresses have been achieved in this aspect, especially in the establishment of models for fitting the impedance data [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Moreover, electrochemical measurements of hot corrosion were conducted mostly in deep molten salts, which are quite different from the thin films of fused salts occurring in practical industrial environments.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Study of Hot Corrosion of the Mo-Rich Ni3Al-Base Alloy IC6 at 750–800 °C Beneath Solid Na2SO4 Deposits

2011

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A two-electrode probe was used for electrochemical impedance studies of hot corrosion kinetics of molybdenum-containing Ni 3 Al-base alloy IC6 covered with a solid Na 2 SO 4 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 Na 2 MoO 4 -MoO 3 -Na 2 SO 4 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.

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“…Hot corrosion is composed of not only oxidation reactions at high temperatures but also electrochemical reactions [9,10]. The combined effect of oxidation and electrochemical reactions accelerates the corrosion of metals or alloys deployed in service under hot corrosion environments.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of metals or alloys with a solid NaCl deposit in wet oxygen at medium temperature

Liu

Wang

2011

Sci. China Technol. Sci.

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Electrochemical impedance study of corrosion of B-1900 alloy in the presence of a solid Na2SO4 and a liquid 25 wt.% NaCl–75 wt.% Na2SO4 film at 800 °C in air

Cited by 5 publications

References 11 publications

Electrochemical-Impedance-Spectroscopy (EIS) Study of Corrosion of Steels 12CrMoV and SS304 Beneath a Molten ZnCl2–KCl Film at 400 °C in Air

Electrochemical-Impedance-Spectroscopy (EIS) Study of Corrosion of Steels 12CrMoV and SS304 Beneath a Molten ZnCl2–KCl Film at 400 °C in Air

Electrochemical Impedance Study of Hot Corrosion of the Mo-Rich Ni3Al-Base Alloy IC6 at 750–800 °C Beneath Solid Na2SO4 Deposits

Corrosion behavior of metals or alloys with a solid NaCl deposit in wet oxygen at medium temperature

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