Influence of carbon on stress corrosion cracking of high strength pipeline steel

Wang, Li Wei; Du, Cuiwei; Liu, Z.Y.; Wang, X.H.; Li, X.G.

doi:10.1016/j.corsci.2013.06.051

Cited by 40 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As discussed in Section 4.2 , ferrite grains are preferentially attacked when the X70 steel is immersed in the testing solution. Therefore, the electrochemical driving force for cracks to propagate within a grain is higher than that at grain boundaries [ 32 , 41 ], resulting in the transgranular stress corrosion cracking (TGSCC). When the X70 steel is protected by a CP potential of −0.775 V SCE , the anodic reaction is inhibited.…”

Section: Discussionmentioning

confidence: 99%

Combined Effect of Alternating Current Interference and Cathodic Protection on Pitting Corrosion and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in Near-Neutral pH Environment

Wang

Cheng

et al. 2018

Materials

View full text Add to dashboard Cite

Influence of alternating current (AC) on pitting corrosion and stress corrosion cracking (SCC) behavior of X70 pipeline steel in the near-neutral pH environment under cathodic protection (CP) was investigated. Both corrosion and SCC are inhibited by −0.775 VSCE CP without AC interference. With the superimposition of AC current (1–10 mA/cm2), the direct current (DC) potential shifts negatively under the CP of −0.775 VSCE and the cathodic DC current decreases and shifts to the anodic direction. Under the CP potential of −0.95 VSCE and −1.2 VSCE, the applied AC current promotes the cathodic reaction and leads to the positive shift of DC potential and increase of cathodic current. Local anodic dissolution occurs attributing to the generated anodic current transients in the positive half-cycle of the AC current, resulting in the initiation of corrosion pits (0.6–2 μm in diameter). AC enhances the SCC susceptibility of X70 steel under −0.775 VSCE CP, attributing to the promotion of anodic dissolution and hydrogen evolution. Even an AC current as low as 1 mA/cm2 can enhance the SCC susceptibility.

show abstract

Section: Discussionmentioning

confidence: 99%

Combined Effect of Alternating Current Interference and Cathodic Protection on Pitting Corrosion and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in Near-Neutral pH Environment

Wang

Cheng

et al. 2018

Materials

View full text Add to dashboard Cite

show abstract

“…Stress corrosion cracking (SCC) is one of the most important causes of failures in buried pipelines, mainly in the transport of hydrocarbons [1,2]. The environments that generate SCC in the pipelines are generally electrolytes caught between the detached coating and the surface of the pipeline 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

“…Previous studies have shown that the electrochemical methods and slow strain rate tensile (SSRT) tests are the effective ways to study the corrosion resistance with or without applied stress [4,5,13,14]. In this study, polarization curve of X80 pipeline steel in high-pH solution was tested, from which the corrosion potential and the stable passivity region can be determined.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, pipelines mainly experience two types of SCC, high-pH and near-neutral-pH SCC respectively, though SCC in acid environment has been found in recent years [4,5]. The mechanism of high-pH SCC is mainly attributed to anodic metal dissolution and repeated rupture and re-passivation of passive films that form over the crack tip [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects Of Anodic Protection On SCC Behavior Of X80 Pipeline Steel In High-pH Carbonate-Bicarbonate Solution

Zhao¹,

Zou²,

Xia³

et al. 2015

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The potentiodynamic polarization test and slow strain rate tensile tests of X80 pipeline steel were performed in 0.5M Na 2 CO 3 -1M NaHCO 3 solution to study the electrochemical and stress corrosion cracking properties. The results of potentiodynamic polarization test show that there is an obvious stable passive region, about from 0v to 0.8V (SCE), indicating that anodic protection is feasible. The results of slow strain rate tensile tests show that the stress corrosion cracking sensibility is high and cathodic protection effect is restricted due to the hydrogen permeation. However, the elongation, yielding strength and tensile strength all increase with anodic protection. The higher anodic protection potential in the stable passive region is benefit to improve tensile strength and yielding strength. However, the higher elongation is obtained at 0.5V (SCE) anodic protection potential.Keywords: X80 pipeline steel, stress corrosion cracking, high-pH solution, anodic protection Badania polaryzacji potencjodyniamicznej oraz próby powolnego rozciągania (SSRT) przeprowadzono na stali typu X80 w roztworze 0,5M Na 2 CO 3 -1M NaHCO 3 . Określono odporność na korozję elektrochemiczną oraz zbadano zjawisko naprężenio-wego pękania korozyjnego. Rezultaty badań polaryzacji potencjodynamicznej wykazały istnienie stabilnego obszaru pasywacji w zakresie potencjału od 0V do 0,8V (SCE: półogniwo odniesienia -elektroda kalomelowa). Próby powolnego rozciągania pokazały wysoką wrażliwość materiału na naprężeniowe pękanie korozyjne i ograniczenia ochrony katodowej w związku z przenikaniem wodoru. Ochrona anodowa natomiast, zwiększa znacząco wydłużenie próbki, granicę plastyczności oraz wytrzymałość na rozciąganie. Ponadto zwiększanie wartości potencjału w stabilnym obszarze pasywacji dodatkowo poprawia te właściwości.

show abstract

Influence of carbon on stress corrosion cracking of high strength pipeline steel

Cited by 40 publications

References 42 publications

Combined Effect of Alternating Current Interference and Cathodic Protection on Pitting Corrosion and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in Near-Neutral pH Environment

Combined Effect of Alternating Current Interference and Cathodic Protection on Pitting Corrosion and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in Near-Neutral pH Environment

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

Effects Of Anodic Protection On SCC Behavior Of X80 Pipeline Steel In High-pH Carbonate-Bicarbonate Solution

Contact Info

Product

Resources

About