A Study on Stress Corrosion Cracking of X70 Pipeline Steel in Carbonate Solution by EIS

Shahriari, A.; Shahrabi, T.; Oskuie, A.A.

doi:10.1007/s11665-012-0418-6

Cited by 9 publications

(5 citation statements)

References 29 publications

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“…8 and 9, suggest that the dissolution and growth of the passive films were primarily influenced by the chemical conditions, not by the microstructures. In carbonate-free 5 g/L bicarbonate solutions, the interfaces showed evidence of adsorptioncontrolled processes, of Nyquist spectra similar to the reported by other researchers, of two depressed, overlapped capacitive arcs [28,29]. As a Nyquist spectrum size correlates qualitatively to charge-transfer resistance [30], the base steel was highly resistant to corrode, but it is interesting to note the decrease and then the increase of resistance over time, as shown in Fig.…”

Section: Electrochemical Impedance Spectroscopy and Open Circuit Potesupporting

confidence: 83%

Passivation of HAZs of API‐X100 pipeline steel in bicarbonate‐carbonate solutions at 298 K

Eliyan

Icre

Alfantazi

2013

Materials & Corrosion

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This research explores electrochemical correlations between heat‐affected zones (HAZs), produced by Gleeble© thermal simulation cycles, and their passivation behavior in bicarbonate–carbonate solutions. The investigations were carried out in comparison with the base API‐X100 steel in naturally aerated 0.5 g/L chloride solutions, containing a matrix of bicarbonate and carbonate concentrations at 298 K. The slow 0.05 mV/s potentiodynamic scans revealed that the passivation onsets earlier in proportion with the bicarbonate concentrations, possessing accordingly greater immunity against chloride ions on HAZs cooled at 10 and 60 K/s from 1223 K peak temperature. The HAZs cooled at 10 K/s, particularly in concentrated carbonate solutions, showed the most stable passivation, and the HAZs cooled at 60 K/s showed the lowest cathodic activity regardless of the chemical conditions. −0.1 V, versus saturated calomel electrode, potentiostatic currents and the open‐circuit potentials decreased and increased, respectively, with the carbonate concentration, confirming with the main potentiodynamic polarization results, and a corresponding passivation behavior of the HAZs, regardless of a bicarbonate–carbonate condition, was relatively similar. In contrary to the 60 K/s HAZs, the 10 K/s HAZs showed evidence of growing passive films with time and high charge‐transfer resistance, as measured by the EIS tests.

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Section: Electrochemical Impedance Spectroscopy and Open Circuit Potesupporting

confidence: 83%

Passivation of HAZs of API‐X100 pipeline steel in bicarbonate‐carbonate solutions at 298 K

Eliyan

Icre

Alfantazi

2013

Materials & Corrosion

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“…Under the structure, these cracks can have intergranular or grain boundary morphology. In terms of macro cracks, SCC has a fragile appearance and factors such as temperature, pressure, concentration, pH, viscosity, part material and fluid flow are among the environmental parameters that affect the crack growth rate [1]. This type of corrosion is one of the most common types of corrosion in the industry, in which, in addition to the corrosiveness of the environment, the mechanical stress factor is also a necessary condition for its occurrence.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of ultrasonic shock on corrosion behavior of stainless steel 316

NezamAbadi¹,

Bolhassani²

2022

MASM

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Refineries and petrochemical industries, due to the presence of all-metal equipment and acidic environment, have high corrosion. This study investigates the effect of ultrasonic shock on the corrosion behavior of 316 stainless steels in order to the increasing use of stainless steels in these industries. The aim of this study was to investigate the effect of ultrasonic stress relief method on increasing the strength of parts in corrosive environments. It should be noted that the residual stress in the samples is created by welding. In this study, first the considered sample is De-tensioning using ultrasonic vibration at a frequency of 20 kHz, then the obtained results are compared with the results of samples without De-tensioning operation and also thermal De-tensioning operation. XRD method used to measure the residual stress. The obtained results show that in ultrasonic method and heat treatment, the amount of residual stress is reduced by 58.7% and 54.3%, respectively. It has also been observed that the use of ultrasonic waves has increased the life of the sample in a corrosive environment.

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“…Therefore, it is important to carry out these measurements when the sample is under stress to obtain electrochemical data during the SCC process. In this sense, electrochemical impedance spectroscopy (EIS) is an electrochemical technique that has been used to study passivation breakdown, crack initiation and propagation, and other events that take place during the SCC process on different metals [ 24 , 25 , 26 , 27 ]. 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.…”

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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A Study on Stress Corrosion Cracking of X70 Pipeline Steel in Carbonate Solution by EIS

Cited by 9 publications

References 29 publications

Passivation of HAZs of API‐X100 pipeline steel in bicarbonate‐carbonate solutions at 298 K

Passivation of HAZs of API‐X100 pipeline steel in bicarbonate‐carbonate solutions at 298 K

Investigation of the effect of ultrasonic shock on corrosion behavior of stainless steel 316

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

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