AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism

Ibrahim, Ibrahim; Meyer, Michel; Takenouti, H.; Tribollet, Bernard

doi:10.5935/0103-5053.20150302

Cited by 4 publications

(3 citation statements)

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“…Thus, below the equilibrium potential, the applied cathodic current makes electrons available to the metal; therefore, no anodic electrochemical reactions can take place. Consequently, if no oxidation reaction takes place, such as iron ion production, this can occur Recently, Ibrahim et al [73][74][75] proposed a theoretical approach (Part 1, 2, 3) to evaluate the effect of double layer capacitance and electrolyte resistance on corrosion current density and potential shift. The authors stated that corrosion rate enhancement is due to the faradaic rectification as a consequence of the nonlinear current-potential relationship [73].…”

Section: Breakdown Of the Passive Film And High-ph Corrosionmentioning

confidence: 99%

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

2020

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Cathodic protection (CP), in combination with an insulating coating, is a preventative system to control corrosion of buried carbon steel pipes. The corrosion protection of coating defects is achieved by means of a cathodic polarization below the protection potential, namely −0.85 V vs. CSE (CSE, copper-copper sulfate reference electrode) for carbon steel in aerated soil. The presence of alternating current (AC) interference, induced by high-voltage power lines (HVPL) or AC-electrified railways, may represent a corrosion threat for coated carbon steel structures, although the potential protection criterion is matched. Nowadays, the protection criteria in the presence of AC, as well as AC corrosion mechanisms in CP condition, are still controversial and discussed. This paper deals with a narrative literature review, which includes selected journal articles, conference proceedings and grey literature, on the assessment, acceptable criteria and corrosion mechanism of carbon steel structures in CP condition with AC interference. The study shows that the assessment of AC corrosion likelihood should be based on the measurement of AC and DC (direct current) related parameters, namely AC voltage, AC and DC densities and potential measurements. Threshold values of the mentioned parameters are discussed. Overprotection (EIR-free < −1.2 V vs. CSE) is the most dangerous condition in the presence of AC: the combination of strong alkalization close to the coating defect due to the high CP current density and the action of AC interference provokes localized corrosion of carbon steel.

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Section: Breakdown Of the Passive Film And High-ph Corrosionmentioning

confidence: 99%

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

2020

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“…In addition, mathematical methods have been applied to illustrate the AC corrosion mechanism. The mathematical models developed by Lalvani [ 11 ], Ibrahim [ 12 ], and Bosch [ 13 ] confirm the existence of higher harmonic components of the faradaic current response when the AC amplitude is large. In addition, Lazzari [ 14 ] and Wang et al [ 15 ] used the harmonic and fundamental current observed via AC voltammetry [ 16 , 17 ] to explore the nature of the electrode process.…”

Section: Introductionmentioning

confidence: 98%

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

Wang

et al. 2017

Materials

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This study employs potential-monitoring techniques, cyclic voltammetry tests, alternating current (AC) voltammetry methods, and surface characterization to investigate the AC corrosion of cathodically protected X80 pipeline steel. In a non-passive neutral solution at pH 7.2, a sufficiently negative potential completely protects steel at an AC current density of 100 A/m2. In an alkaline solution at pH 9.6, more serious AC corrosion occurs at more negative cathodic protection (CP) potential, whereas without CP the steel suffers negligible corrosion. In addition, the interface capacitance increases with AC amplitude. Based on these results, the AC corrosion mechanisms that function under various conditions are analyzed and described.

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“…They found that the AC interference gives the most pronounced effect near the open circuit potential and they also comprehensively discussed the aspects of signal frequency, Tafel slopes and interfacial capacitance. In addition, Ibrahim and Tribollet et al [23][24][25] systematically investigated the AC induced corrosion of underground steel pipelines under cathodic protection. They proposed that the ACinduced corrosion originates from the faradaic rectification, which includes a shift of the DC corrosion potential and an enhancement in the kinetics of the faradaic reactions.…”

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confidence: 99%

Distinction in Corrosion Behaviors of Duplex Stainless Steel 2205 Induced by Different Waveform Alternating Voltages Interference

Dai

Jun

Sun

et al. 2019

J. Electrochem. Soc.

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Anisotropic corrosion behaviors of duplex stainless steel induced by different waveform alternating voltage (AV) interferences have never been elucidated. The results of FeCl 3 pitting immersion tests reveal that the critical pitting temperature (CPT) of 2205 samples is decreased with the interferences of three waveform AV signals. For the AV with equal root mean square (RMS) value on electrode samples, the triangular wave induces much stronger etching on DSS 2205 than the sinusoidal and square ones. However, the sinusoidal and triangular AV interferences trigger the most severe pitting corrosion in high-temperature solution (>50°C). The weight loss induced by pitting corrosion is greater than that by strong etching on samples. Regarding the etching behavior, the austenite in the duplex phase exhibits an inferior corrosion resistance and is preferentially dissolved.

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AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism

Cited by 4 publications

References 0 publications

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

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

Distinction in Corrosion Behaviors of Duplex Stainless Steel 2205 Induced by Different Waveform Alternating Voltages Interference

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