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03417 Electrochemical noise measurement on UNS 10276 in oxidizing hydrochloric acid solutions at high temperature

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Product Number: 51300-03417-SG
ISBN: 03417 2003 CP
Author: H.Inoue, S.Mori, Y.Maeda
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The corrosion potential fluctuation, or electrochemical noise (EN) of UNS 10276 Alloy (C-276 alloy) working electrode (WE) was measured in an oxidizing hydrochloric acid (1.04x10-3mol dm -3 HCl + 100ppm H202) at high temperatures up to 380°C. The potential of the WE was sampled every 0.5s with respect to a Ti electrode immersed in the ambient temperature region. The change in the fluctuation form and its intensity with the solution temperature was examined. To investigate the relationship between the fluctuation form and the corrosion phenomenon taken place on the WE, the temperature dependence of the polarization resistances (Rp) and the cross-sectional views was examined. The random potential fluctuations were measured at the temperatures of 210 and 240°C, and the RD-type (rapid drop followed by slow recovery) fluctuations were observed at temperatures between 270 to 330°C. The RpS and the cross-sectional views proved the WE had been subjected intense general corrosion at the former temperatures but localized corrosion at the later temperatures. No distinct fluctuations were measured at the temperatures below 210°C and above 330°C, and in these conditions, no corrosion traces were observed on the cross-sectional views. Keywords: supercritical, subcritical, water oxidation, SCWO, noise analysis, ENA, nickel-base alloy, corrosion monitoring
The corrosion potential fluctuation, or electrochemical noise (EN) of UNS 10276 Alloy (C-276 alloy) working electrode (WE) was measured in an oxidizing hydrochloric acid (1.04x10-3mol dm -3 HCl + 100ppm H202) at high temperatures up to 380°C. The potential of the WE was sampled every 0.5s with respect to a Ti electrode immersed in the ambient temperature region. The change in the fluctuation form and its intensity with the solution temperature was examined. To investigate the relationship between the fluctuation form and the corrosion phenomenon taken place on the WE, the temperature dependence of the polarization resistances (Rp) and the cross-sectional views was examined. The random potential fluctuations were measured at the temperatures of 210 and 240°C, and the RD-type (rapid drop followed by slow recovery) fluctuations were observed at temperatures between 270 to 330°C. The RpS and the cross-sectional views proved the WE had been subjected intense general corrosion at the former temperatures but localized corrosion at the later temperatures. No distinct fluctuations were measured at the temperatures below 210°C and above 330°C, and in these conditions, no corrosion traces were observed on the cross-sectional views. Keywords: supercritical, subcritical, water oxidation, SCWO, noise analysis, ENA, nickel-base alloy, corrosion monitoring
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