An Introduction to Corrosion Mechanisms and Models

Taylor, Christopher D.; Gale, Julian D.; Strehblow, Hans‐Henning; Marcus, Philippe

doi:10.1002/9781119057666.ch1

Cited by 7 publications

(9 citation statements)

References 190 publications

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“…By comparing the E b (H 2 O–H 2 O) values for random and ordered water, we find that the thermal effect reduces its internal binding energy by 6-fold (from −0.36(±0.04) to −0.06(±0.01) eV). A nanofilm surface ( S ) is defined to be hydrophilic (hydrophobic) when it has a E b (H 2 O– S ) larger (smaller) than the E b (H 2 O–H 2 O) for random liquid water . According to the calculated E b values in Figure e, we conclude that both the NiO and NiOOH surfaces are hydrophilic, while the Ni(OH) 2 and NiO 2 surfaces are hydrophobic.…”

Section: Resultsmentioning

confidence: 87%

“…During the oxidation processes on a metal surface, the fast early stage oxidation may result in a passive film with a nanoscale thickness, for example, ≲2 nm as for Al 2 O 3 , which is followed by an exponentially slower late-stage oxidation. − The corrosion resistance of the metal substrates in aqueous environments is usually determined by the electrochemical stabilities of these (hydr)oxide nanofilms. For example, many corrosion processes (e.g., pitting corrosion) are always initiated by the localized breakdown of that nanoscale passivating film, which is in contact with the aqueous environments. ,− …”

Section: Introductionmentioning

confidence: 99%

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Understanding Electrochemical Stabilities of Ni-Based Nanofilms from a Comparative Theory–Experiment Approach

Huang

Cwalina

et al. 2019

J. Phys. Chem. C

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The electrochemical stabilities of nanofilms of Ni oxides and hydroxides are of special importance to the diverse fields of catalysis, energy storage and conversion, and alloy corrosion resistance. Many coexisting intrinsic and environmental factors may simultaneously become significant when the material size is reduced to ultrathin dimensions, making it challenging to unravel the multiple interacting mechanisms active in complex nanoscale structural architectures. Here we establish a comparative theory–experiment approach to accurately study the stabilities of nanoscale Ni-based compounds against oxidation under various electrochemical conditions and use it to quantitatively reveal the roles of surface termination, thickness, water adsorption, and supporting substrate on phase stability. We use density functional theory to calculate the energies of Ni-based nanofilms at different thicknesses subjected to various boundary conditions and environments, including free-standing, suspended in water, and substrate-supported nanofilm geometries. We use this data to simulate the corresponding nanofilm electrochemical phase diagrams and comprehensively explain various reported electrochemical phenomena. Our theoretical findings are further validated by an electrochemical experiment designed here, where the potential-driven growth of (hydr)oxide nanofilms on Ni substrates in different solutions is precisely characterized using in situ polarized neutron reflectometry. The obtained quantitative results and insights into the microscopic corrosion mechanisms will be useful for the design, synthesis, and application of other nanoscale transition-metal compounds; in addition, the comparative theory–experiment approach can be readily translated to accurately study the electrochemical properties of other complex nanoscale systems.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Understanding Electrochemical Stabilities of Ni-Based Nanofilms from a Comparative Theory–Experiment Approach

Huang

Cwalina

et al. 2019

J. Phys. Chem. C

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“…The generation of analytical forms for the asphaltene molecule–atom interaction has been previously discussed through use of specific molecular mechanics (MM) numerical estimates of the interaction potential between Fe, Al, and Cr atoms and a known asphaltene molecular structure, such as using the COMPASS force field. Recently, − it has also been pointed out that the use of the COMPASS force field to model interactions in organic molecules/metal systems is adequate.…”

Section: Modelmentioning

confidence: 99%

Study of the Adhesion Force of Asphaltene Aggregates to Metallic Surfaces of Fe and Al

et al. 2015

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Atomic force microscopy (AFM) was used to measure the adhesion force of asphaltene aggregates to metallic surfaces of aluminum (Al) and iron (Fe) at room temperature and atmospheric pressure. A simple analytical expression based on Lindhard's continuum planar potential (CPP) approximation that incorporates the effect of the surrounding fluid (a solvent) and has no fitting parameters was developed and tested with the experimental results. This expression provided predictions in good agreement with measured data.

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“…Since reinforcement, such as concrete, is one of the components of reinforced concrete constructions, its corrosion has been studied by many scientists [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Corrosion mechanisms depend on the great number of external factors, including the following: aggressive environment features, the element stress–strain state, the presence of initial stresses, corrosion spread state, the potential difference, local impairments and damages, uniformity of concrete protective layer and the presence of regions with heterogeneous chemical characteristics. It is important to take into consideration existing defects, cohesion and adhesion properties of the coating, thermal effects and grain size [ 1 , 2 ].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Corrosion Fatigue Damages of Rebars under Loading in Time

2021

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Nowadays, a relatively small number of studies concern the study of corrosion processes in reinforced concrete structures under load. Additionally, rather little research has been carried out concerning changes in the stress–strain state parameters of structures under the simultaneous action of aggressive environment and load. This issue requires additional experimental and theoretical investigation. Determination of mechanical properties, fatigue characteristics and susceptibility to corrosion cracking was performed on samples of reinforcing St3GPF steel. The chemical composition of steel was determined by structural analysis. The spectral method for the determination of alloying elements and impurities in steels is based on the excitation of iron atoms and admixtures by electric discharge, decomposition of radiation into a spectrum, followed by its registration on photoplate with the use of electrograph. Experimental tests of samples in an aggressive environment under the action of statically applied tensile force showed that corrosion damage has little effect on the strength characteristics. At the same time, the decrease in area reduction and the decrease in strain were recorded. Additionally, the action of cyclic loads in an aggressive environment leads to a significant reduction in the fatigue limit to values from 20 to 24% of the yield strength of the original samples, which is 2–3 times lower than the fatigue limit of undamaged samples.

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An Introduction to Corrosion Mechanisms and Models

Cited by 7 publications

References 190 publications

Understanding Electrochemical Stabilities of Ni-Based Nanofilms from a Comparative Theory–Experiment Approach

Understanding Electrochemical Stabilities of Ni-Based Nanofilms from a Comparative Theory–Experiment Approach

Study of the Adhesion Force of Asphaltene Aggregates to Metallic Surfaces of Fe and Al

Corrosion Fatigue Damages of Rebars under Loading in Time

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