Corrosion of Galvanized Steel Under Different Soil Moisture Contents

Pereira, Roseana Florentino da Costa; Oliveira, Edkarlla Sousa Dantas de; Lima, Maria Alice Gomes de Andrade; Brasil, Simone L. D. C.

doi:10.1590/1516-1439.341714

Cited by 27 publications

(18 citation statements)

References 4 publications

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“…In 1979, research showed a direct correlation between the mass loss in pipework and the moisture content of soils [48]. In 2015, the results of a study to evaluate the effect of soil moisture on corrosion confirmed its important influence on corrosion rates [51]. The reason for this is that liquid water represents the essential electrolyte for electrochemical corrosion reactions.…”

Section: Presence Of Watermentioning

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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Section: Presence Of Watermentioning

confidence: 99%

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Arriba-Rodriguez

Balsera

Fernández

et al. 2018

Metals

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“…Otherwise, a corrosion attack would tend to follow localized pits [16]. As reported by Pereira et al, soil moisture less than 20% is associated with high soil resistivity, which decreases until reaching minimum resistivity by adding water [21].…”

Section: Moisture Contentmentioning

confidence: 79%

Statistical Soil Characterization of an Underground Corroded Pipeline Using In-Line Inspections

Amaya-Gómez

Bastidas‐Arteaga

Muñoz

et al. 2021

Metals

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Underground pipelines have a space-dependent condition that arises from various soil properties surrounding the pipeline (e.g., moisture content, pH, aeration) and the efficiency of protection measures. Corrosion is one of the main threats for pipelines and is commonly monitored with in-line inspections (ILI) every 2 to 6 years. Preliminary characterizations of the surrounding soil allow pipeline operators to propose adequate protective measures to prevent any loss of containment (LOC) of the fluid being transported. This characterization usually requires detailed soil measurements, which could be unavailable or very costly. This paper implements categorical measurements of soil properties and defect depth measurements obtained from ILI to characterize the soil in the surroundings of a pipeline. This approach implements an independence test, a multiple correspondence analysis, and a clustering method with K-modes. The approach was applied to a real case study, showing that more severe defects are likely located in poorly drained soils with high acidity.

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“…The moisture content of the studied soil ranges from 14.33% to 29.09% characteristic of moist soils with fair drainage [6]. Low moisture content generally suggests high resistivity and low soil corrosivity [8,23,24]. An increase in soil moisture content lowers soil resistivity and favours corrosion of metallic structures.…”

Section: Resultsmentioning

confidence: 99%

Geoelectrical and Physicochemical Evaluation of Soil Corrosivity on Metallic Pipelines: A Case Study

Akinlabi

Olaiya

2021

JGEESI

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Geoelectrical sounding and physicochemical analyses were conducted on the topsoil underlying Osupa area in Ogbomoso, south western Nigeria to evaluate the soil corrosivity on the metallic water pipelines across the area. Schlumberger electrical resistivity soundings were conducted at 24 stations with electrode spacing varied from 1 to 100 m. The resistivity data were interpreted by using partial curve matching and computer-aided 1D inversion. Physicochemical analyses were also conducted on soil samples collected from about 1 m depth in test pits dug at points coincident with the sounding stations, following the BS/AWWA/ANSI Standards for Corrosivity testing to determine the soil pH, redox potential, moisture content and chloride content. The soil corrosivity was evaluated based on soil resistivity alone and the combined effect of soil pH and resistivity. The studied soils have resistivity ranging from 10 Ωm to 492 Ωm and thickness varying from 0.5 m to 4.6 m. The pH, moisture content, redox potential and chloride content range from 4.22 to 8.41, 14.33% to 29.09%, +50 mV to +97 mV and 102 ppm to 196 ppm respectively. The corrosivity intensity, based on the combined effect of soil pH and resistivity is essentially Medium-to- Medium-High being Medium at 10 locations, Medium-High at 8 locations, and High, Medium-Low, and Low at 2 locations each. More reliable information can be obtained about soil corrosivity toward buried metallic structures if the combined effect of the soil parameters affecting soil corrosion is considered.

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Corrosion of Galvanized Steel Under Different Soil Moisture Contents

Cited by 27 publications

References 4 publications

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Statistical Soil Characterization of an Underground Corroded Pipeline Using In-Line Inspections

Geoelectrical and Physicochemical Evaluation of Soil Corrosivity on Metallic Pipelines: A Case Study

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