scholarly journals Effects of Soil Properties to Corrosion of Underground Pipelines: A Review

2015 ◽  
Vol 3 (1) ◽  
pp. 14-18
Author(s):  
S.R.A. Saupi ◽  
M.A. Sulaiman ◽  
M.N. Masri
Keyword(s):  
Galvanic Corrosion ◽  
Soil Environment ◽  
Corrosion Attack ◽  
Outward Appearance ◽  
Corrosion Properties ◽  
Soil Medium ◽  
Underground Pipelines ◽  
Corrosion Pitting ◽  
Porous Soil ◽  
External Corrosion

This review concentrates on corrosion properties that expose to soil environment. Forms of corrosion classified with respect to outward appearance and altered physical properties are uniform attack, galvanic corrosion, erosion corrosion, stress corrosion, crevice corrosion, pitting and inter-granular corrosion. A porous soil may retain moisture for a longer period for optimum aeration and indirectly increase the initial corrosion rate. External corrosion is corrosion attack upon the outside of the pipe soil medium and the most failure mechanisms experienced by buried steel pipelines. Many systems possibly in contact with soil have risk to be corroded such as storage tanks and pipelines.

Effects of Soil Physical Properties to the Corrosion of Underground Pipelines

2016 ◽  
Vol 840 ◽  
pp. 309-314 ◽  
Author(s):  
Siti Rumaisha Ahmad Saupi ◽  
Nur Ain Haris Abdul Haris ◽  
Mohamad Najmi Masri ◽  
Muhammad Azwadi Sulaiman ◽  
Bashree Abu Bakar ◽  
...  
Keyword(s):  
Rate Increase ◽  
Ph Value ◽  
Soil Physical Properties ◽  
Soil Environment ◽  
Buried Pipelines ◽  
Corrosion Attack ◽  
Corrosion Properties ◽  
Material Loss ◽  
Underground Pipelines ◽  
Numerical Scale

Corrosion of metals in soil be able to change from comparatively fast material loss to insignificant effects, depending on soil environment. Corrosion is a process of deterioration of metal surfaces degraded into another compound. Soil is one of the medium known to have constituted to corrosion of metals. The soil creates an environment for the corrosion to react. The buried pipelines are exposed to the soil that may experience corrosion attack. The study of the soil as corrosion environment is important to mitigate the problem due to the environment and economy. There are factors that contribute to the corrosion process. This study concentrates on corrosion properties that expose to soil environment particularly underground pipelines. The mild steel coupons taken from actual pipelines, stimulating and analyzing the physic-chemical characteristics of the soil environment. The soil is sandy clay in natural. A total summed index of 2 numerical scale, thus, indicates that the soil tested was mildly to non-corrosive. The corrosion rate increase with increasing of moisture content and pH value. The observations on the coupon surface also did in order to study the morphology.

Effects of Surface Oxide Coating on Corrosion Behavior of Ti-1023/LY12 Galvanic Couple

2013 ◽  
Vol 668 ◽  
pp. 880-884 ◽  
Author(s):  
Jun Xiu Shi ◽  
Jian Hua Liu
Keyword(s):  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Oxide Coating ◽  
Optical Microscope ◽  
Open Circuit ◽  
Localized Corrosion ◽  
Corrosion Attack ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Galvanic Couple

Galvanic corrosion behavior of Ti-1023 titanium alloy coupled to LY12 aluminum alloy was investigated in 3.5% NaCl solution. Particular attention was given to the effect of anodized coatings on corrosion behaviors of Ti-1023/LY12 galvanic couple. Galvanic test was conducted on the following couples: Ti-1023/LY12, Ti-1023/anodized LY12 and anodized Ti-1023/anodized LY12, respectively. Corrosion properties including open circuit potential (Eoc) of each material, galvanic corrosion potential (Eg) and galvanic corrosion current (Ig) of the couples were monitored. Corrosion morphology was observed by optical microscope (OM) and corrosion mechanisms were analyzed and discussed. It was showed that anodized coatings significantly decreased Eg and Īg of the couples and provide effective protection of the anode from suffering corrosion attack. Only slight localized corrosion was detected on anodized LY12 alloy in the two anodized couples and the LY12 in anodized Ti-1023/anodized LY12 couple was found to be least susceptible to galvanic corrosion. The LY12 alloy in the bare couple: Ti-1023/LY12, was found to be highly susceptible to galvanic corrosion and suffered severe uniform and localized corrosion attack

scholarly journals Corrosion Behavior in External Surface of API 5L X52 Underground Pipelines in Buzurgan Region/ Missan province

2021 ◽  
Vol 11 (1) ◽  
pp. 36-52
Author(s):  
Dr. Kadhim F. Alsultani ◽  
Zahraa Qasim Mutasher
Keyword(s):  
Field Survey ◽  
External Surface ◽  
Soil Environment ◽  
Buried Pipes ◽  
Oil Pipeline ◽  
Underground Pipelines ◽  
Corrosion Phenomenon ◽  
Weight Loss Method ◽  
Loss Method ◽  
External Corrosion

External corrosion of underground pipeline is one of the most common damage mechanismsassociated with the soil environment particularly in ageing pipelines. This study investigatesthe external corrosion phenomenon for exporting crude oil pipeline (28'') in Buzurgan region /Missan province. Corrosion rate was measured by using weight loss method, and Tafelextrapolation. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS)were also used in this work. During the field survey, soil sample was taken from Buzurganregion (collected as close as possible to buried pipes at 1.2 m) for tests were carried out for soilthat included: pH, moisture content, resistivity and chemical composition (XRF, XRD, andsoluble salts). It was found that the environment of the areahas a low soil resistivity value(870) ohm.cm. On other hand, the samples that were immersed in Buzurgan soil showed thethat highest damage was by pitting corrosion due to the high soluble salts content particularlychlorides (7388 )ppm and sulfates (2570) ppm.

Galvanic corrosion properties of differently PVD-treated magnesium die cast alloy AZ91

2005 ◽  
Vol 193 (1-3) ◽  
pp. 223-229 ◽  
Author(s):  
H. Hoche ◽  
C. Blawert ◽  
E. Broszeit ◽  
C. Berger
Keyword(s):  
Cast Alloy ◽  
Galvanic Corrosion ◽  
Corrosion Properties ◽  
Alloy Az91 ◽  
Die Cast

scholarly journals Acrylate-Based Hybrid Sol-Gel Coating for Corrosion Protection of AA7075-T6 in Aircraft Applications: The Effect of Copolymerization Time

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 948 ◽  
Author(s):  
Peter Rodič ◽  
Romana Cerc Korošec ◽  
Barbara Kapun ◽  
Alenka Mertelj ◽  
Ingrid Milošev
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Condensation Reaction ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
Gel Permeation Chromatography ◽  
Corrosion Attack ◽  
Scanning Calorimetry ◽  
Corrosion Properties ◽  
Pressure Differential Scanning Calorimetry

Pre-hydrolysed/condensed tetraethyl orthosilicate (TEOS) was added to a solution of methyl methacrylate (MMA) and 3-methacryloxypropyltrimethoxysilane (MAPTMS), and then copolymerised for various times to study the influence of the latter on the structure of hybrid sol-gel coatings as corrosion protection of aluminium alloy 7075-T6. The reactions taking place during preparation were characterised using real-time Fourier transform infrared spectroscopy, dynamic light scattering and gel permeation chromatography. The solution characteristics were evaluated, using viscosimetry, followed by measurements of thermal stability determined by thermogravimetric analysis. The optimal temperature for the condensation reaction was determined with the help of high-pressure differential scanning calorimetry. Once deposited on 7075-T6 substrates, the coatings were evaluated using a field emission scanning electron microscope coupled to an energy dispersive spectrometer to determine surface morphology, topography, composition and coating thickness. Corrosion properties were tested in dilute Harrison’s solution (3.5 g/L (NH4)2SO4 and 0.5 g/L NaCl) using electrochemical impedance spectroscopy. The copolymerization of MMA and MAPTMS over 4 h was optimal for obtaining 1.4 µm thick coating with superior barrier protection against corrosion attack (|Z10 mHz| ~ 1 GΩ cm2) during three months of exposure to the corrosive medium.

scholarly journals Thickness dimensions of the contact layer of soil-rigid body interaction

2019 ◽  
Vol 97 ◽  
pp. 04040 ◽  
Author(s):  
Bakhtiyar Khusanov ◽  
Barno Rikhsieva
Keyword(s):  
Rigid Body ◽  
Structural Changes ◽  
Soil Layer ◽  
Contact Layer ◽  
Interaction Process ◽  
Soil Medium ◽  
One Dimensional ◽  
Underground Pipelines ◽  
The Finite Difference Method ◽  
Dimensional Statement

Solution of the problems of longitudinal interaction of underground pipelines with soil in a one-dimensional statement requires precise measurements of the thickness of the soil layer contacting with the pipeline. In order to determine the dimensions of the contact layer of soil, the behavior of soil medium under shear interaction of a rigid body with soil is studied. Under straining in soil medium, structural changes denoted by the coefficient of structural destruction are taken into account; the condition of complete adhesion is taken in the contact rigid body – soil boundary. The interaction process under consideration is investigated numerically by the finite difference method. The results of the calculations are presented in the form of graphs and are analyzed. From the obtained results, the maximum values of the thickness of soil contact layer are determined as well as the layers with the corresponding degree of structural destruction depending on the geometric dimensions of the rigid body.

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