Mechanism of corrosion of cast iron covered by aged corrosion products: Application of electrochemical impedance spectrometry

Sancy, Mamié; Gourbeyre, Y.; Sutter, Éliane; Tribollet, Bernard

doi:10.1016/j.corsci.2009.12.026

Cited by 92 publications

(41 citation statements)

References 13 publications

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“…This Q t value is therefore associated with diffusion impedance combined with a charge transfer process [17]. Moreover, the low frequency loop exhibits an angle θ with respect to the real axis that approaches 45 ○ as the frequency increases, which is in agreement with a diffusion process [43]. In the present case, the diffusion impedance could represent the hindered diffusion of oxygen through a non-conducting layer, where oxygen reduction only occurs after O 2 reaches the metal/film interfase.…”

Section: Of 43supporting

confidence: 57%

“…Ferrous phosphate could be oxidized to ferric phosphate by reaction with oxygen [54]. is a good conductor [30,43], it is quite insoluble and known to inhibit iron dissolution [27][28][29]. In addition, this phosphate layer could delay oxygen diffusion through the duplex interface, hindering the consumption of the electrons produced by the anodic reaction taking place at the metal-film interface [43,54].…”

mentioning

confidence: 99%

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Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Yohai¹,

Vázquez²,

Valcarce³

2013

Electrochimica Acta

142

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Please cite this article as: L. Yohai, M. Vázquez, M.B. Valcarce, Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments, Electrochimica Acta (2013), http://dx.doi.org/10. 1016/j.electacta.2013.03.180 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Micro Raman spectra clearly show the incorporation of phosphates to the passive film.Impedance spectroscopy results can be interpreted assuming a duplex surface film formed in the presence of phosphates. In the conditions of this investigation, phosphate ions behave as mixed-type corrosion inhibitors, protecting steel against corrosion in chloride-contaminated environments.

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Section: Of 43supporting

confidence: 57%

mentioning

confidence: 99%

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Yohai¹,

Vázquez²,

Valcarce³

2013

Electrochimica Acta

142

View full text Add to dashboard Cite

show abstract

“…Under aerobic abiotic conditions, only corrosion products and calcium carbonate varieties were observed without any presence of biofilm. Similar observations were made by Sancy et al for aged cast iron pipe samples after 30 days of immersion in Evian water.…”

Section: Resultssupporting

confidence: 88%

Microbial activity involvement on soil corrosion of ductile iron – Electrochemical & microscopic study

Meroufel

Ayashi

Touzain

et al. 2019

Materials & Corrosion

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Microbial activity involvement on soil corrosion of old ductile iron was studied through electrochemical tests and microscopic analysis. Immersion test was conducted at room temperature under stagnant conditions during 62 days where sterilization and oxygen parameters were considered. Mechanisms were investigated through DC and AC electrochemical measurements combined to microscopic observation of surface products by SEM. The results showed an accelerated corrosion in the case of aerated biotic condition with evidence of oxygen promoting bacterial activity. However, corrosion inhibition was observed under deareated biotic condition. The results imply clearly the role of burying depth and soil compactness on ductile iron water pipe life time.

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“…This shows that the cathodic process, that is, O 2 reduction, has been affected. More precisely, this indicates that coupon WE CP1 behaves like a semi‐infinite porous electrode . This means that O 2 reduction involves, in the present case, the diffusion of O 2 inside the pores of the mineral layer covering the steel surface and its reduction on the walls of these pores.…”

Section: Resultsmentioning

confidence: 72%

Cathodic protection of buried steel structures: Processes occurring at the steel/soil interface during wet/dry cycles

Mahlobo

Olubambi

Jeannin

et al. 2019

Materials & Corrosion

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The behavior of steel coupons buried in soil under cathodic protection (CP) was studied during wet/dry cycles using electrochemical impedance spectroscopy and voltammetry. The coupons were left at open circuit potential for 7 days before applying CP for 51 days at potentials of −0.8 and −1.0 V versus Cu/CuSO4 on coupons 1 and 2, respectively. Wet/dry cycling was achieved by first saturating the soil with an electrolyte inside a sealed electrochemical cell and by allowing the soil to dry by opening the top lid of the cell for various periods in the experiment. Surface analysis was performed after the experiments by X‐ray diffraction and Raman spectroscopy. The soil electrolyte resistance Rs depended mainly on the variations of soil moisture for coupon 1 but was strongly affected by the effects induced by CP for coupon 2. Residual corrosion rates of 17–18 and 7–10 µm/year for coupons 1 and 2, respectively, were estimated via voltammetry. The kinetic parameters vary with the polarization level so that the data obtained with a coupon polarized at a given potential cannot be used to predict the residual corrosion rate of a coupon polarized at another potential.

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Mechanism of corrosion of cast iron covered by aged corrosion products: Application of electrochemical impedance spectrometry

Cited by 92 publications

References 13 publications

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Microbial activity involvement on soil corrosion of ductile iron – Electrochemical & microscopic study

Cathodic protection of buried steel structures: Processes occurring at the steel/soil interface during wet/dry cycles

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