Empirical models for long-term localised corrosion of cast iron pipes buried in soils

Melchers, Robert E.; Petersen, Robert B.; Wells, T.

doi:10.1080/1478422x.2019.1658427

Cited by 12 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And thus the CR measured under these conditions can be expected to be lower than the long-term rate of localised corrosion penetration of cast iron pipes buried in silty, light and medium clays (which have CR in the range 66-73 μm y −1 ), when the burial environment is less dense since backfill soils are prone to permeation by rainwater, run-of water, etc. This would lead to a great availability of free water at the soil-metal wall interface and therefore to higher CR [52]. The effect of the water content observed in the present study is consistent with that reported earlier by Petersen et al for the effect of moisture content on the corrosion of mild steel buried in clay soils (many studies are available for sandy soils and loams, while few recent studies are for clay soil) [53].…”

Section: Discussionsupporting

confidence: 92%

Electrochemical and characterisation study of corrosion of reinforcing steel embedded in kaolinite: two-year exposure study

Baghdad

Saadi

2020

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

Corrosion of reinforcing steel embedded in kaolinite clay was studied for a two year exposure period. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation (POL) revealed a decrease of the corrosion rate (CR) of the steel bars up to average values of 2.5 μm y −1 . X-ray photoelectron spectroscopy (XPS), and Scanning electron microscope (SEM) equipped with Energydispersive X-ray spectroscopy (EDX) techniques showed the formation of a thick and compacted corrosion layer composed of several iron oxides, namely, Fe 2 O 3 , Fe (OH) 2 , Fe 3 O 4 and FeCO 3 . The external corrosion product is composed mainly of magnetite (Fe 3 O 4 ) and siderite (FeCO 3 ). EDX mapping showed a homogeneous distribution of the elements across the cross-sectional of the corrosion layer.

show abstract

Section: Discussionsupporting

confidence: 92%

Electrochemical and characterisation study of corrosion of reinforcing steel embedded in kaolinite: two-year exposure study

Baghdad

Saadi

2020

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

show abstract

“…In fact, despite the various developments, underground structural failures continue to occur [ 1 , 2 , 3 ]. Here, the corrosion of metallic infrastructures in underground soil is a major issue that presents numerous safety and economic concerns [ 4 , 5 , 6 , 7 , 8 ]. In short, pipelines can be damaged by corrosion, which can lead to the failure of the structures within a soil environment.…”

Section: Introductionmentioning

confidence: 99%

Calibrating the Impressed Anodic Current Density for Accelerated Galvanostatic Testing to Simulate the Long-Term Corrosion Behavior of Buried Pipeline

Hong

Lim

et al. 2021

Materials

View full text Add to dashboard Cite

Various studies have been conducted to better understand the long-term corrosion mechanism for steels in a soil environment. Here, electrochemical acceleration methods present the most efficient way to simulate long-term corrosion. Among the various methods, galvanostatic testing allows for accelerating the surface corrosion reactions through controlling the impressed anodic current density. However, a large deviation from the equilibrium state can induce different corrosion mechanisms to those in actual service. Therefore, applying a suitable anodic current density is important for shortening the test times and maintaining the stable dissolution of steel. In this paper, to calibrate the anodic current density, galvanostatic tests were performed at four different levels of anodic current density and time to accelerate a one-year corrosion reaction of pipeline steel. To validate the appropriate anodic current density, analysis of the potential vs. time curves, thermodynamic analysis, and analysis of the specimen’s cross-sections and products were conducted using a validation algorithm. The results indicated that 0.96 mA/cm2 was the optimal impressed anodic current density in terms of a suitable polarized potential, uniform corrosion, and a valid corrosion product among the evaluated conditions.

show abstract

“…Some of the widely accepted and have been used classification methods to evaluate the corrosive nature of the soil to buried-metallic pipelines are ASTM [23][24][25], NACE [26,27] and ANSI/AWWA [28,29]. The ASTM and NACE systems are practiced previously to assess the degree of soil corrosivity to the buried-metallic pipelines [30][31][32][33][34][35][36]. In both the ASTM and NACE systems, the electrical conductivity/resistivity of soils is believed as the most important parameter for the evaluation of the buried-pipe corrosion, although the effects of other physicochemical soil parameters take account of less significance.…”

Section: Introductionmentioning

confidence: 99%

A Classification Approach for Corrosion Rating of Soil to Buried Water Pipelines: A Case Study in Budhanilkantha-Maharajganj Roadway Areas of Nepal

Poudel¹,

Dahal²,

Dinesh³

et al. 2020

WJAC

View full text Add to dashboard Cite

The present study was focused to estimate six characteristics of soil specimens taken from 0.3 to 1.5 m sampling depth of six sampling sites of Budhanilkantha-Maharajganj roadsides using standard methods, and was assessed their corrosive nature to the buried-metallic pipelines using an empirical corrosion rating model. The estimated soil pH, moisture, resistivity, redox potential (ORP), chloride and sulfate ions were 6.4-7.9, 7-45%, 4.5 × 10 3 -45.5 × 10 3 Ohm. cm, 317-514 mV (SHE), 12-86 ppm, and 40-294 ppm, respectively, in all the soil sample specimens. The experimental results indicated that the soils could be rated as mildly corrosive to less corrosive groups to the buried galvanized-steel and cast iron pipes in the study areas. A good positive or negative correlation coefficient between resistivity, moisture, chloride and sulfate contents implies that these soil parameters have an equal contribution to the rating of soil corrosivity. A polyethylene-sheet wrapping (i.e., encasement) around the galvanized-steel and cast iron water pipelines or the use of non-conducting materials of gravel/sand around the burying ground could be sufficient for the extension of their life up to 50 years or more. The empirical model is successfully applied for the corrosion rating of soil samples and could be progressive in the future for soil corrosion rating of soils to the underground waterworks. Present findings would be insightful and suggestive in making the corrosive land maps of the studied areas which would be helpful for the potable water pipeline works in other urban areas of Nepal.

show abstract

Empirical models for long-term localised corrosion of cast iron pipes buried in soils

Cited by 12 publications

References 23 publications

Electrochemical and characterisation study of corrosion of reinforcing steel embedded in kaolinite: two-year exposure study

Electrochemical and characterisation study of corrosion of reinforcing steel embedded in kaolinite: two-year exposure study

Calibrating the Impressed Anodic Current Density for Accelerated Galvanostatic Testing to Simulate the Long-Term Corrosion Behavior of Buried Pipeline

A Classification Approach for Corrosion Rating of Soil to Buried Water Pipelines: A Case Study in Budhanilkantha-Maharajganj Roadway Areas of Nepal

Contact Info

Product

Resources

About