Effect of pH Value on the Electrochemical and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in the Dilute Bicarbonate Solutions

Cui, Zhongyu; Liu, Z. Y.; Wang, L. W.; C., H.; Du, Cuiwei; Li, X. G.; Wang, X.

doi:10.1007/s11665-015-1697-5

Cited by 21 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The percentage of elongation (%η) was lower as the pH of the solution decreased. Cui et al [ 22 ] reported a similar behavior of %η in the same solution, however the pH range (4–6.8) was different from the present study. Also, the elastic modulus (E σ ) of the steel decreased in the test solution in comparison to that obtained in air.…”

Section: Resultscontrasting

confidence: 71%

“…For an approximate physical description of the EIS measurements of the steel in NS4 solution at different pH during SSRT test, equivalent electric circuits (EEC) are suggested as shown in Figure 6 . The first EEC ( Figure 6 a) was employed to fit the EIS data in the acid solution (pH 3), in which the R s is solution resistance, R ct is the charge-transfer resistance, L ads and R ads are the inductance and resistance of the adsorption process, respectively [ 22 , 54 ]. The constant phase element (CPE dl ) is an empirical circuit element that represents the non-ideal capacitive behavior of the electrode.…”

Section: Resultsmentioning

confidence: 99%

“…Their electrochemical measurements showed that corrosion rates of the steel decreased with pH and revealed the involvement of adsorption and parallel adsorption–diffusion in near-neutral and mildly alkaline conditions, respectively. Cui et al [ 22 ] studied the SCC behavior of X70 pipeline steel in dilute bicarbonate solutions at several pH (4–6.8). Their result indicated that when the solution pH decreased from 6.8 to 5.5, SCC susceptibility decreased because of the increment of the anodic dissolution; and when the solution pH decreased from 5.5 to 4.0, SCC susceptibility increases due to the enhancement of cathodic reactions.…”

Section: Introductionmentioning

confidence: 99%

“…Despite mentioned above, the effect of soil solution pH on the SCC behavior of pipeline steels is not well defined and more research should be done on this issue. An important point to note is that most of the works concerning the effect of pH on the SCC behavior in simulated soil solution was performed electrochemical measurements in unstressed samples [ 20 , 21 , 22 , 23 ]. Therefore, it is important to carry out these measurements when the sample is under stress to obtain electrochemical data during the SCC process.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2021

View full text Add to dashboard Cite

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).

show abstract

Section: Resultscontrasting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2021

View full text Add to dashboard Cite

show abstract

“…This mechanism is attributed to selective anodic dissolution of the grain border and to the repeated rupture of the passive film that forms in the tip of the crack. On the other hand, the SCC at almost neutral pH (pH 5-8.5) is associated with diluted solutions generated by the underground water with a transgranular crack morphology; [5][6][7] however, there is no consensus about its mechanism. Some research [8][9][10] proposes that the crack can be induced by the synergic effect between the anodic dissolution and the diffusion of the H in the steel.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Galván-Martínez

Orozco-Cruz

Carmona-Hernandez

et al. 2019

Metals

View full text Add to dashboard Cite

The effect of different cathodic potentials applied to the X70 pipeline steel immersed in acidified and aerated synthetic soil solution under stress using a slow strain rate test (SSRT) and electrochemical impedance spectroscopy (EIS) was studied. According to SSRT results and the fracture surface analysis by scanning electron microscopy (SEM), the steel susceptibility to stress corrosion cracking (SCC) increased as the cathodic polarization increased (Ecp). This behavior is attributed to the anodic dissolution at the tip of the crack and the increment of the cathodic reaction (hydrogen evolution) producing hydrogen embrittlement. Nevertheless, when the Ecp was subjected to the maximum cathodic potential applied (−970 mV), the susceptibility decreased; this behavior is attributed to the fact that the anodic dissolution was suppressed and the process of the SCC was dominated only by hydrogen embrittlement (HE). The EIS results showed that the cathodic process was influenced by the mass transport (hydrogen diffusion) due to the steel undergoing so many changes in the metallic surface as a result of the applied strain that it generated active sites at the surface.

show abstract

Corrosion of Q125 Pipe Steel in Model Stratal Water for Different Temperatures and Pressures of Hydrogen Sulfide and Carbon Dioxide

et al. 2022

View full text Add to dashboard Cite

Effect of pH Value on the Electrochemical and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in the Dilute Bicarbonate Solutions

Cited by 21 publications

References 27 publications

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

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

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Corrosion of Q125 Pipe Steel in Model Stratal Water for Different Temperatures and Pressures of Hydrogen Sulfide and Carbon Dioxide

Contact Info

Product

Resources

About