A theoretical study of AC-induced corrosion considering diffusion phenomena

Bosch, Rik-Wouter; Bogaerts, Walter

doi:10.1016/s0010-938x(97)00139-x

Cited by 63 publications

(28 citation statements)

References 16 publications

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“…Some models have been reported to describe corrosion of iron considering oxygen diffusion alone. [21][22] However, in these models, either particular kinetic parameters were given and their results reported qualitatively 10 or the kinetic parameters were simply not stated. [21][22] In the present work, an extensive literature search was performed to find kinetic parameters in order for the model results to have practical significance.…”

Section: Corrosion-february 2002mentioning

confidence: 99%

“…10,[21][22] Since α a in i c 0 = nFk 0 (c Ox ) α a /n (c Re ) α c /n refers to α OH -for hydroxide ion oxidation, α OH -+ α O 2 = n O 2 . For a fixed pH, the following equation is derived based on the expression of i 0 O 2 = nFk 0 (c O 2 ) α OH -/n O2 (c OH -) α O2 /n O2 and because the concentration of hydroxide ion c OH -is constant:…”

Section: Anodic and Cathodic Current Density Expressionsmentioning

confidence: 99%

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Effect of Ferrous Ion Oxidation on Corrosion of Active Iron under an Aerated Solution Layer

Song¹,

Kirk²,

Graydon³

et al. 2002

CORROSION

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A new model was developed to study the effect of ferrous ion oxidation on the corrosion of active iron. When ferrous hydroxide precipitate is present at the iron surface as the result of corrosion, the solution boundary layer near the iron surface is saturated with ferrous hydroxide and the pH and ferrous ion concentration are fixed within the layer. The ferrous hydroxide precipitate and that of ferric hydroxide are often porous and do not provide resistance to the transport of solution species. Since this work deals with active iron corrosion, a passive film at the iron surface is not considered. The results show that ferrous ion oxidation decreases corrosion because it decreases oxygen concentration in the boundary layer. The corrosion rate can be decreased by up to 13.9%. This value is independent of boundary layer thickness, temperature, and saturation factor of ferrous hydroxide. The results indicate that ferrous ion oxidation does have an effect on the rate of iron corrosion and that neglecting ferrous ion oxidation when determining iron corrosion results in an overestimate of the corrosion rate.

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Section: Corrosion-february 2002mentioning

confidence: 99%

Section: Anodic and Cathodic Current Density Expressionsmentioning

confidence: 99%

Effect of Ferrous Ion Oxidation on Corrosion of Active Iron under an Aerated Solution Layer

Song¹,

Kirk²,

Graydon³

et al. 2002

CORROSION

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“…Corrosion is a diffusion-controlled process that occurs on the material surface, especially that of metallic dissimilar joints [1][2][3]. Any mechanical or thermodynamic stress that forms a crack, or any other deficiency, on a system is subject to progressive corrosion, especially at high temperatures [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Predictive Modeling of Corrosion in Al/Mg Dissimilar Joint

et al. 2019

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In the absence of any abnormality (standard conditions), the gradient of any mechanical/thermodynamic stress would be intensified at the dissimilar joint due to an abrupt change in the chemical composition. This paper aims to investigate the effect of delocalizing this stress by imposing an optimum chemical gradient within the dissimilar joint. In this work, we computationally demonstrated that a homogenous distribution of magnesium atoms in the aluminum (100) structure with a specific chemical gradient could potentially reduce the susceptibility of the Mg/Al dissimilar joint towards micro-galvanic corrosion. This is achieved through the minimization of the work function gradient within the dissimilar joint.

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“…Some authors speculate that the formed stone‐hard‐soil “tubercle” may be of lower resistivity and thus behave as an antenna of increased surface area that will pick up both AC and DC currents in the soil and thus escort an autocatalytic corrosion attack by increasing current densities . Enhancement of the cathode reaction (1) by faradaic rectification of the AC current plays a major role in comparison to pure DC conditions . The DC current may be orders of magnitude higher than at regular CP, and thus the alkalization is more pronounced in AC corrosion cases.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stone‐hard‐soil formation from AC corrosion of cathodically protected pipeline

Junker

Belmonte

Kioupis³

et al. 2018

Materials & Corrosion

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A stone‐hard‐soil structure was observed on a metallic pipeline under cathodic protection and subject to alternating current corrosion at a coating defect. Using X‐ray diffraction, energy dispersive X‐ray spectroscopy, ion‐chromatography and inductively coupled plasma optical emission spectroscopy, the stone‐hard‐soil was characterized as being enriched in NaCl. Local alkalization following the cathode reactions caused precipitation of calcite, believed to be partly responsible for the stability of the structure. Very close to the corrosion site at the epicenter, calcite and quartz was depleted, possibly owing to an extremely high pH. Formation of cement‐like minerals and corrosion products is observed.

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A theoretical study of AC-induced corrosion considering diffusion phenomena

Cited by 63 publications

References 16 publications

Effect of Ferrous Ion Oxidation on Corrosion of Active Iron under an Aerated Solution Layer

Effect of Ferrous Ion Oxidation on Corrosion of Active Iron under an Aerated Solution Layer

Predictive Modeling of Corrosion in Al/Mg Dissimilar Joint

Investigation of stone‐hard‐soil formation from AC corrosion of cathodically protected pipeline

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