Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Wang, Huiru; Du, Cuiwei; Li, Yong; Wang, Luntao; De, Ding

doi:10.3390/ma10080851

Cited by 31 publications

(17 citation statements)

References 64 publications

(91 reference statements)

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“…With the increasing development of high voltage power transmission, its sharing common grid with oil and gas pipelines has brought huge risk to pipeline integrity [ 1 , 2 ]. It has been acknowledged that AC interference can speed up the corrosion rate of most metals [ 3 ], but the actual mechanism of AC corrosion is not clear.…”

Section: Introductionmentioning

confidence: 99%

“…Previous works [ 2 , 18 , 19 , 20 ] showed that AC affected the performance of CP system and caused deviation of CP potential from designed values. Hosokawa et al [ 18 ] and Kajiyama et al [ 19 ] reported that pipelines would suffer serious AC corrosion even if they satisfied the CP criterion potential of −0.85 V CSE (CSE corresponds to the copper sulfate electrode).…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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

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“…The weak adsorption of product has little effect on the cathodic scan. This is due to the adsorption of product which required the electrode reaction to provide more material for both diffusion process and adsorption process; therefore the peak occurred at more anodic potentials, in analogy with the succeeding chemical reaction [16,[22][23][24]. Table 4 lists the linear curve coefficients, f=y0+a*x and R-squared values for Figure 7 and Figure 8.…”

Section: Peak Current Functionmentioning

confidence: 99%

Cyclic voltammetry characterization analysis on the cu/flame retardant 4 fabricated biosensor

Hamzah

Malik

Zulhanip

et al. 2020

IJEECS

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Silicon, glass and ceramic are commonly base substrate used in DNA biosensor fabrication due to its biocompatible, expensive, hard and brittle. However due to the difficulty for drilling and dicing, these materials required expensive equipments and complex methodology of fabrication. Large gap of thermal expansion coefficient (TEC) between silicon/glass and film caused microcracks. Hence, the aim of this work is to investigate the suitability and the application of a non-biocompatible material, flame retardant 4 (FR4) as a base substrate for a label free DNA biosensor. Cyclic voltammetry (CV) reversible method has been implemented to test the fabricated Cu/Au on the FR4. It is found that the fabrication of Au has been made possible by the used of oxide-free Cu as an adhesion layer on the FR4 substrate. The area size of counter electrode (CE), working electrode (WE) and reference electrode (RE) are found to be 6.25 mm2, 0.581 mm2 and 1.04 mm2, respectively, in order to achieve the unity reversible redox relationship and to ensure the sensor’s reliability for 10 mM K3Fe(CN)6 solution in 0.1 M KCl. Thus it can be concluded that the proposed FR4-based substrate fulfilled the CV reversible process characterization.

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“…The existing studies concerning dynamic interference also indicated that the effect of the alternating cathodic process also played an important role in affecting the corrosion rate and corrosion morphology. [34][35][36][37][38][39] According to field measurement results, the fluctuation of pipe-to-soil potential and coupon current density could be beyond normal protection range resulting in increasing corrosion risk when the dynamic interference was severe. In the authors' previous work, [40] the corrosion behavior of X70 steel under the symmetric dynamic stray DC interference was investigated in simulated soil solutions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the corrosion behavior of X70 steel under asymmetric dynamic DC interference

Qin

et al. 2020

Materials & Corrosion

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The corrosion behavior of X70 steel in simulated soil environment under asymmetric dynamic direct current (DC) interference was studied by immersion tests. The experimental results showed that the negatively asymmetric dynamic DC interference would induce localized corrosion. Under the same dynamic period of 160 ±80 s, when the negative half-wave current density remained stable at −10 mA/cm 2 and the positive half-wave one decreased from 7 to 1 mA/cm 2 , the equivalent diameters of the localized corrosion zones became smaller and the steel samples demonstrated typical pitting corrosion morphologies. To further explore the effect of asymmetric dynamic DC interference on the localized corrosion behavior of carbon steel, a variety of experimental measurements were carried out including real-time DC potential monitoring, in-situ near-surface pH measurements, cyclic voltammetry, and Mott-Schottky tests. It was found that the localized corrosion behavior was probably related to the breakdown of passive film formed on the metal surface exposed to negatively asymmetric DC current generated high pH conditions.

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Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Cited by 31 publications

References 64 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

Cyclic voltammetry characterization analysis on the cu/flame retardant 4 fabricated biosensor

Experimental study on the corrosion behavior of X70 steel under asymmetric dynamic DC interference

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