Potential fluctuation during early stage of stress corrosion cracking of type-304 stainless steel in chloride solution

Analysis on spiral crack in thick diamond-like carbon film subjected to spherical contact loading

“…We also plot the amplitude of AE (peak to peak) in red solid circles. The amplitudes of E.C.1 and 2 are relatively small, around 0.04 V. However, E.C.3 shows quite large amplitude of more than 0.2 V. At this force of 13 N during the unloading process, potential shift towards the less noble side with the amplitude of several tens mV is observed, which corresponds to the mode I fracture AE signal E.C.3; this is also referred to as the rapid drop type-CPF (RD-CPF) [37,39]. This fluctuation strongly suggests that the solution streamed into the substrate due to film cracking, and the RD-CPFs are produced when the local anodic current takes place on the substrate.…”

“…In this damage monitoring technique, the fracture process and the mode of the film fracture can be successfully revealed by a radiation pattern analysis of the Lamb wave AEs [36]. More recently, measurement of the corrosion potential fluctuation is also employed to detect film cracking, since the CPF is produced by the initiation of the localized corrosion [37,38] of substrate metal induced by local fracture of the film when the sample is immersed in a selected corrodant. The corrodant used in CPF is a solution which produces a non-Faradic reaction of the substrate metal, and when the film cracking occurs in a solution, local anodic current due to the anodic dissolution of the substrate metal is expected to produce a rapid drop of the corrosion potential to active potential.…”

Corrosion behavior of 1420 Al–Li alloy under MgCl2 drops in 33% relative humidity

“…Other researchers shared this view . Meanwhile, some analysis methods, such as fast fourier transform (FFT) , wavelets and maximum entropy method (MEM) , have been developed to analyze EN data.…”