EIS Behavior of Experimental High-Strength Steel in Near-Neutral pH and Load Conditions

Barraza-Fierro, Jesus Israel; Serna, S.; Campillo-Illanes, Bernardo Fabián; Castaneda, Homero

doi:10.1007/s11661-017-3973-5

Cited by 3 publications

(1 citation statement)

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“…Some studies [ 28 , 29 , 30 ] have carried out EIS measurements simultaneously on unstressed and stressed specimens, and they have suggested that the evolution of the phase angle shift (φ) at specific frequencies may be related to the initiation and propagation of cracks. On the other hand, researchers [ 28 , 31 , 32 , 33 ] have related changes in the low frequency region of the EIS Nyquist plots with the formation of cracks and have developed complex equivalent circuit models to simulate crack geometry changes and crack tip/wall electrochemical activity changes during cracking process.…”

Section: Introductionmentioning

confidence: 99%

Study of SCC of X70 Steel Immersed in Simulated Soil Solution at Different pH by EIS

et al. 2021

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An electrochemical study of stress corrosion cracking (SCC) of API X70 steel in a simulated soil solution at different pH values (3, 8 and 10) was carried out. The stress conditions were implemented by slow strain rate stress test (SSRT) and the SCC process was simultaneously monitored by electrochemical impedance spectroscopy (EIS). Fracture surface analysis and corrosion product analysis were performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results show that the susceptibility to SCC was higher as the pH decreases. In the acid solution, hydrogen evolution can occur by H+ and H2CO3 reduction, and more atomic hydrogen can diffuse into the steel, producing embrittlement. EIS results indicated that the anodic dissolution contributed to SCC process by reducing the charge transfer resistances during the SSRT test. While SEM micrographs shown a general corrosion morphology on the longitudinal surface of samples. At higher pH (pH 8 and pH 10), the SCC susceptibility was lower, which it is attributed to the presence of corrosion products film, which could have limited the process. Using the angle phase (φ) value it was determined that the cracking process started at a point close to the yield strength (YS).

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