Analysis of electrochemical noise obtained from pure aluminium in neutral chloride and alkaline solutions

Corrosion behavior of Mg‐10Gd‐2Y‐0.4Zr alloy under thin electrolyte layers

“…In addition, it is also possible to analyze data even when two or more failure modes are present at the same time. The cumulative probability F(t) of a failure system can be introduced just as Weibull distribution function based upon a ''weakest-link'' model [48][49][50][51][52][53], which is expressed as:…”

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

“…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.…”

“…In a real situation, however, there is a distortion in the Poisson probability, and hence, a deviation of the value of m from unity, caused by a difference in many experimental conditions such as the chemistry of the test solution, the applied potential and the interactions between localized events. On the other hand, Pyun et al reported that the value of m increases from 0.7 up to unity with a decreasing applied potential (Pyun et al, 1993) for the pit generation at the surface of Al alloy at room temperature, and the value of m decreases from 0.4 to 0.1 with the addition of SO 4 2-and MoO 4 2-ions in a 0.1 M NaCl solution (Na et al, 2007a) and with the addition of SO 4 2-, NO 3-and PO 4 3-ions in a 1M HCl solution (Na & Pyun, 2007) for the pit initiation at the surface of pure Al at room temperature. 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).…”

“…(1), the cumulative probability F(f n ) at each f n i s d e t e r m i n e d n u m e r i c a l l y b y a m e a n r a n k approximation (Cottis, 2001). In this work, the probability of f n for the Pb-assisted SCC was analyzed using the Weibull distribution function, the most commonly used cumulative probability function for predicting a life and failure rate (Na & Pyun, 2007;Na et al, 2007a;Na et al, 2007b). Using the Weibull distribution function, the probability of the mean timeto-failure, t n , which corresponds to 1/f n , is expressed as,…”

“…In previous works (Na & Pyun, 2007;Na et al, 2007a;Na et al, 2007b;Park & Pyun, 2004;Pyun et al, 1993;Pyun et al, 1994), the conditional event generation rate r(t) of a localized corrosion was introduced as a failure rate using the values of m and n as,…”