Occurrence of Anodic Current and Corrosion of Steel in Aqueous Media Under Fluctuating Cathodic Protection Potentials

Gupta, Rajat; Tan, Yongjun; Esquivel, J.; Forsyth, Maria

doi:10.5006/1637

Cited by 11 publications

(7 citation statements)

References 23 publications

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“…In view of this, the potential fluctuations with time induced by both alternating and direct current sources were simulated by square potential pulses. This method of simulating stray currents has been used in various versions and, accordingly, has been given various names such as the anodic transient test after cathodic protection [ 14 , 15 , 16 ], square wave polarization (SWP) [ 17 , 18 , 19 , 20 , 21 , 22 ], and sign-alternating cycling polarization (SACP) [ 23 ]. SACP is a version of SWP where the potential jumps between its cathodic and anodic values.…”

Section: Introductionmentioning

confidence: 99%

“…When the potential pulses are square, as under the action of an alternating current, the formation of pits is observed [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. The local nature of steel corrosion can be explained by a significant increase in the pH of the near-electrode layer of the solution when the cathodic current is flowing.…”

Section: Introductionmentioning

confidence: 99%

“…On applying an anodic potential in an alkaline environment, passivation of the metal can occur. If the amplitude of the potential jump and the duration of the anodic transient exceed critical values, breakdown of the passive film occurs and the steel dissolves locally [ 14 , 15 , 16 , 17 ]. This concept is consistent with the mechanism of AC corrosion of steel pipes in soil [ 1 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cathodic Protection Potential Fluctuations on the Corrosion of Low-Carbon Steels and Hydrogen Absorption by the Metal in Chloride Solutions with Nearly Neutral pH

Маршаков

Rybkina

2022

Materials

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Considerable fluctuations in the cathodic protection potential under the impact of stray currents lead to the occurrence of local corrosion on steel structures operated in soils and seawater. The potential fluctuations induced by both alternating and direct current sources can be simulated by cycling a square potential step. This paper covers the impact of sign-alternating cyclic polarization (SACP) on the general and local corrosion of carbon steel in 3.5% NaCl solution containing a borate buffer (pH 6.7) and without it. A decrease in the cathodic half-period potential (Ec) of SACP inhibited the general corrosion and accelerates the local corrosion of steel in both solutions, which was associated with an increase in the amount of hydrogen in the metal. Increasing the duration of the SACP cathodic half-period increased the pit density and total area at less negative Ec values. At more negative Ec values, an increase in the duration of cathodic polarization reduced the intensity of steel local corrosion in the unbuffered chloride solution. This effect is explained by blocking of the pit nucleation centers on the metal surface by a layer of steel dissolution products formed in the near-electrode electrolyte layer with a high pH. The combined body of data shows that hydrogen absorption by the metal determines the corrosion behavior of carbon steel under the impact of SACP in chloride solutions, which should be taken into account in the development of models of the corrosion of steel structures under the action of stray currents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Cathodic Protection Potential Fluctuations on the Corrosion of Low-Carbon Steels and Hydrogen Absorption by the Metal in Chloride Solutions with Nearly Neutral pH

Маршаков

Rybkina

2022

Materials

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“…In this work, anodic pitting and the breakdown of passive films formed on a copper‐nickel alloy (constantan) are investigated in model seawater . A mechanism based on strain due to oxidised copper and nickel species and subsequent reactions at the metal|passive film interface is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, anodic pitting and the breakdown of passive films formed on a copper-nickel alloy (constantan) are investigated in model seawater. [38][39][40][41][42] A mechanism based on strain due to oxidised copper and nickel species and subsequent reactions at the metal j passive film interface is proposed. Redox processes responsible for the strain are identified by comparison of data from voltammetry to data in Pourbaix diagrams (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Linking the Cu(II/I) and the Ni(IV/II) Potentials to Subsequent Passive Film Breakdown for a Cu−Ni Alloy in Aqueous 0.5 M NaCl

et al. 2020

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Copper and copper–nickel alloys are known to form partially passive films in marine conditions, both naturally and under positive potential bias. Here, the anodic passivation behaviour of copper and of constantan (Cu54Ni45Mn1) as a model for a copper‐nickel alloy are investigated and compared at high positive overpotentials and in 0.5 M NaCl(aq). Abrupt potential‐dependent passive film breakdown is observed for both Cu and Cu−Ni alloys during voltammetry and during chronoamperometry experiments. For Cu, a single transitions occurs at 0.2 V vs. SCE consistent with a Cu(II/I) process, leading to interfacial stress and breaking of a passive CuCl film. For Cu−Ni alloy, two stages are observed at 0.3 V vs. SCE due to a Cu(II/I) process and at 1.7 V vs. SCE due to a sub‐interfacial Ni(IV/II) process. A breakdown mechanism is proposed based on redox processes at the buried interface at the metallic conductor | passive ion conductor junction.

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Pitting Corrosion of 10Ni8CrMoV High-Strength Steel Induced by a Potential Perturbation

Fan

Ding

Zhang

et al. 2018

J. of Materi Eng and Perform

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Occurrence of Anodic Current and Corrosion of Steel in Aqueous Media Under Fluctuating Cathodic Protection Potentials

Cited by 11 publications

References 23 publications

Effect of Cathodic Protection Potential Fluctuations on the Corrosion of Low-Carbon Steels and Hydrogen Absorption by the Metal in Chloride Solutions with Nearly Neutral pH

Effect of Cathodic Protection Potential Fluctuations on the Corrosion of Low-Carbon Steels and Hydrogen Absorption by the Metal in Chloride Solutions with Nearly Neutral pH

Linking the Cu(II/I) and the Ni(IV/II) Potentials to Subsequent Passive Film Breakdown for a Cu−Ni Alloy in Aqueous 0.5 M NaCl

Pitting Corrosion of 10Ni8CrMoV High-Strength Steel Induced by a Potential Perturbation

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