Surface evolution of a corroding metal as a moving boundary problem by random assignment of anodic and cathodic sites

Shaik, Liyakhath Ahmed; Thamida, Sunil Kumar

doi:10.1016/j.jelechem.2016.09.048

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…The assignment of the boundary conditions is random and periodic in time, which enables a macroscopic uniform corrosion progress of the surface. The model is independent from the introduced parameters for the microelectrodes, that is, their width

Δ x

or total number

N

and the period for changing their boundary conditions

Δ t

. The new approach is tested by reproducing the rates of uniform corrosion for zinc and steel from the NSS test. In contrast to the work of Shaik and Thamida, the model predicts the corrosion depth for both zinc and steel in the correct order of magnitude. In addition, it reproduces the ratio of corrosion rates for zinc to steel. Galvanic corrosion of a zinc‐steel couple is modeled without computing the concentration of reactants or corrosion products but with consideration of varying cathode activity.…”

Section: Discussioncontrasting

confidence: 71%

“…However, Shaik and Thamida utilize two polarization curves of steel obtained both under the virtually same conditions. Their measurements of 304 stainless steel in pH‐neutral electrolyte yield a potential difference by less than 10 mV and the predicted anodic current is

i_{normala} < 5 E - 5

mA/cm 2 . Thus, the predicted corrosion rate according to Faraday's law is

< 1.6 E - 3 μ m /d

, which is three orders of magnitude smaller compared to the norm.…”

Section: Resultsmentioning

confidence: 94%

“…describe the surface of one metal by exactly one electrode. However, the here presented model follows the same approach proposed by Shaik and Thamida . They model uniform corrosion by dividing the single metal surface into multiple so‐called microelectrodes with width

Δ x

as depicted in the left side of Figure .…”

Section: Computational Modelingmentioning

confidence: 99%

“…A third popular approach is based on the strong assumption of a homogenous conductive electrolyte and employs the mixed potential theory (MPT) . This model is used by Deshpande, Bösch et al, and Shaik and Thamida . Since it is less computational challenging, larger systems can be modeled describing longer time scales of corrosion progress.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced predictive corrosion modeling via randomly distributed boundary conditions

Gießgen

Mittelbach

Höche

et al. 2018

Materials & Corrosion

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An advanced computational model based on the mixed potential theory (MPT) is presented, which is able to predict the progress of uniform as well as galvanic corrosion on car components made of zinc and steel (CR300). Previous approaches based on the MPT are computationally less challenging than other simulation models and are typically suitable for galvanic corrosion. In this work, an approach closer to reality is proposed by considering uniform corrosion aspects. Therefore, the metal surface is characterized by oxygen‐deficient and oxygen‐rich areas to model the anodic and cathodic reactions, respectively. Polarization curves are measured in 5 wt% NaCl electrolyte and are then used during finite element methods (FEM) simulation as respective boundary conditions on the metal surface, leading to a multiple microelectrode system. By randomly defining the microelectrodes as cathodes or anodes, that is, assigning polarization data from the oxygen‐rich or oxygen‐deficient electrolyte, the uniform corrosion is modeled. The independence of the corrosion rates from the arbitrary model parameters and surface width (up to 1 mm) is confirmed. The results from this FEM simulation for zinc and a low‐alloy steel are compared to the normed neutral salt spray (NSS) test and show good qualitative agreement. Further on, the galvanic corrosion of a zinc‐steel couple is modeled and the expected result for varying cathode‐anode surface ratio is reproduced.

show abstract

Δ x

or total number

N

and the period for changing their boundary conditions

Δ t

Section: Discussioncontrasting

confidence: 71%

i_{normala} < 5 E - 5

mA/cm 2 . Thus, the predicted corrosion rate according to Faraday's law is

< 1.6 E - 3 μ m /d

, which is three orders of magnitude smaller compared to the norm.…”

Section: Resultsmentioning

confidence: 94%

Δ x

as depicted in the left side of Figure .…”

Section: Computational Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced predictive corrosion modeling via randomly distributed boundary conditions

Gießgen

Mittelbach

Höche

et al. 2018

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…The current FEM based model originates from for galvanic corrosion model presented by Deshpande and Höche with modifications from Shaik and Thamida and Gießgen et al to account for uniform corrosion. Following assumptions and simplifications are made: …”

Section: Computational Modelingmentioning

confidence: 99%

Enhanced predictive corrosion modeling with implicit corrosion products

Gießgen

Mittelbach

Höche

et al. 2019

Materials & Corrosion

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An advanced mathematical approach to describe the influence of corrosion products on the corrosion rate is presented here. The related model can be used as input equation for numerical predictive corrosion simulations or simply as an empirical model, to extrapolate experimental data of corrosion tests to longer times and to interpret the physical parameters behind. This semiempirical model assumes that a constant share of the dissolved metal precipitates on the surface and hinders the diffusion processes. Hence, the effective corrosion rate decreases exponentially with increasing dissolution. The explicit corrosion progress over time is derived by time integration on a newly developed, time dependent corrosion rate equation. The derived expression can be effortlessly implemented in existing for example finite element method, which is demonstrated for the uniform corrosion of a zinc surface. Furthermore, this approach is qualitatively compared with other empirical models for corrosion products and the validity is demonstrated by fitting of experimental data. A very good agreement between experiment and theory can be achieved for various materials and environments considering no change of the driving corrosion mechanism.K E Y W O R D S corrosion products, corrosion simulation, finite element method, mixed potential theory, uniform corrosion

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Studies on galvanic corrosion of tri-metallic joint of steels in sodium chloride solution

Shaik

Thamida

2019

Materials Today: Proceedings

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Surface evolution of a corroding metal as a moving boundary problem by random assignment of anodic and cathodic sites

Cited by 5 publications

References 13 publications

Enhanced predictive corrosion modeling via randomly distributed boundary conditions

Enhanced predictive corrosion modeling via randomly distributed boundary conditions

Enhanced predictive corrosion modeling with implicit corrosion products

Studies on galvanic corrosion of tri-metallic joint of steels in sodium chloride solution

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