Mathematical Models for Under-Deposit Corrosion in Aerated Media

Chang, Ya-Chiao; Orazem, Mark E.

doi:10.1149/05031.0181ecst

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…Several studies, both experimental and numerical, have been reported over the years, unmasking some key factors of this phenomenon. [37][38][39] To the best of our knowledge, there is still no PF model that can explicitly study the role of deposits in corrosion.…”

Section: Corrosion In Sensitized Alloysmentioning

confidence: 99%

Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals

2019

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Most metals naturally corrode in an engineering environment and form corrosion products. The corrosion products can be either soluble or insoluble in the aqueous solution. The insoluble corrosion products (ICP) could have profound effects on the corrosion kinetics of the concerned metal. In this study, a multi-phase-field formulation is proposed to investigate the effects of ICP formation on pitting corrosion kinetics. The Gibbs free energy of the metal-electrolyte-insoluble corrosion product system consists of chemical, gradient, and electromigration free energy. The model is validated with experimental results and several representative cases are presented, including the effect of the porosity of ICP, under-deposit corrosion, corrosion of sensitized alloys, and microstructure-dependent pitting corrosion. It is observed that corrosion rate and pit morphology significantly depend on ICP and its porosity for the same applied potential.

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Section: Corrosion In Sensitized Alloysmentioning

confidence: 99%

Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals

2019

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“…Only when imidazoline or O 2 was introduced into the brine, UDC would happen. Some other studies (Chang et al , 2014) found that the dissolved oxygen had a promotion effect on the galvanic effect between the DC steel and the bare steel. Pits or crevice corrosion patterns were found on the DC area with oxygen involved.…”

Section: Introductionmentioning

confidence: 91%

“…Current researches indicate that UDC always presents as localized corrosion patterns, and some kinds of inhibitors may lose effect for UDC (Huang, 2013). To study the mechanism of UDC and the inhibition methods of localized corrosion, various experimental studies have been done, and several relative models were established (Zhang et al , 2014; de Reus et al , 2005; Chang et al , 2014). Some researchers consider that the localized corrosion is caused by the inhomogeneous distribution of the corrosive medium beneath the deposit layer (Huang et al , 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on under-deposit corrosion and its inhibition using electrochemical methods and electronic coupon technique

Huang

Yang

et al. 2017

ACMM

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Purpose In this study the aim was to investigate under-deposit corrosion (UDC) behavior and the action effects of amino trimethylene phosphonic acid (ATMP) in the oxygen-contained solution. Design/methodology/approach Electrochemical methods and wire beam electrode techniques were used for the study of ATMP action effect for X65 steel under silica sand and CaCO3 particle deposit. Electronic coupon technique was used for the study of galvanic effect caused by the deposits and the action effect of ATMP. Findings ATMP would cause localized corrosion for the silica sand-covered steel. However, it could inhibit the localized corrosion of the steel beneath CaCO3 particle deposit. Galvanic effect test showed that the galvanic effect caused by the deposits was an important factor for the acceleration of UDC. ATMP had an obvious promotion effect for the galvanic current between bare coupon and silica sand covered coupon and different degrees of localized corrosion were observed beneath both deposits. Originality/value The authors believe that the paper may be of particular interest to the readers of the journal as the measurement methods for the UDC of X65 pipeline steel. The experiment they did in the laboratory found that the inhibitor ATMP has a good inhibition effect for bare steel, but it would accelerate the UDC. Different kinds of deposits would have different influences for the UDC behavior with inhibitor added.

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“…On the other hand, external features inhibit and promote soil aeration and lead to the cells' formation, causing differential aeration [18,19]. An external feature that may lead to that includes the impermeable covers: vegetation, roots, and paving is on the surfaces [20][21][22][23][24][25]. The waterproof cover formation increases corrosion rate, increasing differential aeration due to the increased ratio of cathode and anode surface area [1,5].…”

Section: Underground Corrosion and Differential Aerationmentioning

confidence: 99%

Corrosion in underground infrastructures

Mukhtar

2021

Koroze a Ochrana Materialu

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There is a significant loss due to corrosion of buried infrastructure. Many pipes have failed due to mistreatment happening within them all around the world. Different soil aeration leads to macro corrosion cells that cause critical levels within the path corrosion leading to a loss of structural integrity of the buried pipes underground. This review paper seeks to address and presents a predetermined model developed by using software COMSOL Multiphysics to identify and characterize the areas experiencing a high rate of corrosion beneath the surface due to differential aeration. The pipe surfaces experience electrochemical reactions and reactant transport mechanisms in the soil and the pipes. Porosity and degree of saturation make the closed-form equations used to create the mass transport properties and electrical properties that constitute three-phase medium using standard soil parameters. The current model enables the study of soil property variations and conditions from the external environment pipeline corrosion. The model results conclude and agree well with the literature and case studies done at pipeline failure sites. The model used in this review will then enable water utilities to develop forecasting tools that may be useful for assessment.

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Mathematical Models for Under-Deposit Corrosion in Aerated Media

Cited by 6 publications

References 7 publications

Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals

Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals

Experimental study on under-deposit corrosion and its inhibition using electrochemical methods and electronic coupon technique

Corrosion in underground infrastructures

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