Influence of soil moisture on the residual corrosion rates of buried carbon steel structures under cathodic protection

Dang, D. Nguyen; Lanarde, L.; Jeannin, Marc; Sabot, R.; Refait, Philippe

doi:10.1016/j.electacta.2015.07.097

Cited by 56 publications

(55 citation statements)

References 25 publications

(34 reference statements)

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“…This has shifted focus into monitoring and surveying the CP system by determining the residual corrosion rate of the buried carbon steel, which quantifies the CP's effectiveness, under various soil properties. A method based on voltammetry was then developed to estimate the actual residual corrosion rate of carbon steel in the presence of CP . The idea was to model the polarization curve with kinetic laws to obtain the expression of the anodic current density as a function of potential.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

“…These studies were all performed at constant soil moisture and it could be observed that, in unsaturated soil (25% sat. ), CP could lead to an increase of the active area of the electrode because of electrocapillarity effects …”

Section: Introductionmentioning

confidence: 99%

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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“…With these methods, it is possible to estimate corrosion from on-site measurements, being very useful for maintenance work, but they do not help in designing structures. Another approach studied the effect of a few variables on corrosion, such as the research of Nguyen et al that investigated the corrosion rate from moisture and polarization [121]. However, it is well known that the final corrosion is due to the combined effect of several factors, so these types of simplifications are not very useful when designing structures.…”

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confidence: 99%

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Arriba-Rodriguez

Balsera

Fernández

et al. 2018

Metals

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Around the world, there are thousands of metal structures completely or partially buried in the soil. The main concern in their design is corrosion. Corrosion is a mechanism that degrades materials and causes structural failures in infrastructures, which can lead to severe effects on the environment and have direct impact on the population health. In addition, corrosion is extremely complex in the underground environment due to the variability of the local conditions. The problem is that there are many methods to its evaluation but none have been clearly established. In order to ensure the useful life of such structures, engineers usually consider an excess thickness that increases the economic cost of manufacturing and does not satisfy the principles of efficiency in the use of resources. In this paper, an extended revision of the existing methods to evaluate corrosion is carried out to optimize the design of buried steel structures according to their service life. Thus, they are classified into two categories depending on the information they provide: qualitative and quantitative methods. As a result, it is concluded that the most exhaustive methodologies for estimating soil corrosion are quantitative methods fed by non-electrochemical data based on experimental studies that measure the mass loss of structures.

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“…While the environment under cathodic protection is depleted of oxygen, it is possible that the presence of an alternating voltage may alternate the oxidation step of available iron from Fe(II) to Fe(III) during the anodic half‐wave, and in that way provide the conditions for pyroaurite formation . The observation of pyroaurite may be an indicator for the right conditions for formation of green rust which is also a layered double hydroxide and is found on carbon steel under cathodic protection …”

Section: Discussionmentioning

confidence: 99%

“…This moisture content is expected to be influenced by the potential gradient field around the negatively charged pipe. It has been demonstrated that cathodic protection increases the moisture content of the soil/steel interface in unsaturated soils . The cathode will attract positive ions in solution, and thereby water by the process of electro‐osmosis, since water molecules are attracted to the cations .…”

Section: Discussionmentioning

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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Influence of soil moisture on the residual corrosion rates of buried carbon steel structures under cathodic protection

Cited by 56 publications

References 25 publications

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

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

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

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

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