Electrochemical noise analysis of PbSCC of Alloy 600 SG tube in caustic environments at high temperature

In-situ Monitoring of SCC of Alloy 600 SG Tubing in PWR using EN Analysis

“…9 by a linear curve fitting method were 1.46 for the general corrosion on the unstressed specimen in the caustic solution without any oxidizing impurities, 0.47 for the initiation of SCC on the stressed specimen in the leaded caustic solution, and 0.21 for its propagation in the leaded caustic solution plus CuO. The values of m in this work revealed good agreement with those values previous reported for each stage of the Pb-assisted SCC (Kim & Kim, 2009a).…”

“…The increases of the PSD especially at a low frequency limit in Figs. 4(a) and (b) strongly indicates the increase in the number of localized corrosion events, that is, the initiation and the propagation of Pb-assisted SCC, respectively, as previously reported (Kim & Kim et al, 2009a;Kim & Kim et al, 2009b).…”

“…Interestingly, they also reported that the value of m is 0.33 for the SCC propagation of Alloy 600 in a neutral solution containing PbO at room temperature (Na et al, 2007b). In our previous works (Kim & Kim, 2009a;Na et al, 2007a;Na et al, 2007b), it was reported that the shape parameter m of the Weibull distribution can be regarded as an indicator of types of corrosion. In the present work, the value of m determined from Fig.…”

A Novel Approach for the Evaluation of Under Deposit Corrosion in Marine Environments Using Combined Analysis by Electrochemical Impedance Spectroscopy and Electrochemical Noise

“…EN refers to spontaneous fluctuations (transients) in current and potential, produced by the interaction between the metal dissolution and the electron transfer processes on the electrode surface. Transients can arise in both the electrochemical current (ECN) as well as the electrochemical potential noise (EPN) signal [37]. Despite the advantages of EN measurements, the analysis of EN signals is complicated.…”

Semiconductivity of steam generator tubing alloys in simulated crevice chemistries containing lead and sulphur

“…3,[6][7][8][9][10][11] Lead and sulphur induced corrosion degradation has attracted much attention in recent years and was investigated extensively. 2,7,[12][13][14][15][16][17] Lead on the secondary sides of SGs, as one of the impurities, possibly comes from plant make-up water, condenser cooling water leaks, copper alloys in condensers and feedwater heaters, seals and gaskets in pumps and pipe fittings. 18 Lead is considered as a detrimental species,which leads to SCC, pitting or general corrosion.…”