Probing top-of-the-line corrosion using coupled multi-electrode array in conjunction with local electrochemical measurement

Abstract

An experimental method has been developed for probing top-of-the-line corrosion (TLC) of pipeline steel based on the use of the wire beam electrode (WBE) in conjunction with local electrochemical measurements. Results show that the location of the droplet, the droplet retention time, the water condensation rate and the local TLC rate could be well determined through the macro-cell current mapping and local electrochemical measurements. The precipitation and the scaling tendency of the FeCO3 beneath the droplet were quantitatively estimated. The micro-cell corrosion was significantly influenced by the thickness of the condensed water film and the protectiveness of the FeCO3 layer. The discrepancy of the film formation inside and outside the droplets was the driving force of macro-cell corrosion. The in-situ measurement and visualization of the corrosion processes and kinetics using the modified WBE could be conveniently used to facilitate the understanding of the initiation and propagation of localized TLC.

Crevice corrosion behavior and mechanism of laser additive manufacturing nickel-based alloy under wedge-shaped crevice by using wire beam electrode

“…The phenomenon mentioned above was observed in authors' previous research (Wang et al, 2023a(Wang et al, , 2023b, but the changes in corrosion in the wedge-shaped crevice are different from those in the parallel crevice. First, the crevice width gradually decreases from the crevice mouth to the crevice bottom, and the phenomenon of ion migration inhibited by the decrease in crevice width is more obvious, leading to the appearance of cathodic diffusion-controlled Warburg impedance characteristics inside the (as shown in Figure 7).…”

“…Scholars pay more attention to the influence of the corrosion environment during crevice corrosion rather than the crevice type (Abdulsalam, 2021, Zhang et al , 2021). At crevice, the composition of corrosive media changes as the reactions generating, and the crevice type affects the migration of corrosive media, and, thus, plays a key influence on the corrosion behavior of the material in the crevice (Larche et al , 2015; Song et al , 2009; Wang et al , 2023a, 2023b Xia et al , 2022). Chen et al (2016) studied the crevice corrosion of 304 SS in pure water of high temperature by using a self-made high-temperature crevice corrosion device.…”

An overview of progresses and challenges of electrochemically integrated multi-electrode arrays for probing localised corrosion in complex environmental conditions

“…Although various forms of electrode array probes have been designed and used in various research applications, as described above, more attention should still be given to the simulation of localised corrosion mechanisms occurring in industry practice, especially the possibility of corrosion mechanism change, corrosion environment change and possible transitions from general to localised corrosion. Different ways of designing and constructing electrode array probes for industry applications have been reported in the literature, for instance, some electrode array corrosion probes have been designed recently for various pipeline and marine field-testing conditions [166,[171][172][173][174].…”

The Effects of Microalloying on the Precipitation Behavior and Strength Mechanisms of X80 High-Strength Pipeline Steel under Different Processes

“…The API 5L high grade of X80 pipeline steel is the most mature steel with the highest strength level in the practical application field of natural gas and oil transmission worldwide [12,13]. Microalloy additions are critical for obtaining optimum properties in pipeline steel.…”