Corrosion Failure of the Rocky Point Viaduct

Covino, Bernard S.; Cramer, Stephen D.; Holcomb, Gordon R.; Bullard, Sophie J.; Summers, Cathy A.; Dahlin, C. L.; Laylor, H.M.; McGill, Galen E.

doi:10.31399/asm.fach.bldgs.c9001702

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…These findings are consistent with the observation that adding such solute elements usually increases the corrosion resistance of alloys, while Cu and Fe are usually considered to decrease the corrosion resistance of alloys. 19,29,30 Of course, solubility of the elements, mechanical properties and other considerations should also be considered in alloy design. 31,32…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, a framework for linking atomistic properties with environmental conditions is built to study the competitive adsorption of different species (Cl, H 2 O, OH and O) onto alloy surfaces. Nibased alloys, which represent an important class of CRAs, [14][15][16][17][18][19] are used as an example to develop and validate the framework. In the first part of the work, 20 the adsorption energies of O and Cl were calculated using density functional theory (DFT) for Ni-Cr-X (X = Co, Cu, Fe, Mn, Mo, Ru and W) ternary alloys.…”

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confidence: 99%

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First-Principles Modeling of the Repassivation of Corrosion Resistant Alloys: Part II. Surface Adsorption Isotherms for Alloys and the Chloride Susceptibility Index

Ke¹,

Li²,

Lü³

et al. 2020

J. Electrochem. Soc.

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Quantitatively predicting the corrosion resistance of alloys is vital to the design and application of the next generation of superior corrosion resistant alloys (CRAs). Here, the Chloride Susceptibility Index (CSI), a scientifically based quantitative descriptor for repassivation tendency of CRAs, is proposed as a metric constructed through combining atomistically resolved information regarding adsorption and alloy surface composition with environmental conditions such as applied potential, temperature, pH, and Cl − concentration. Using this method, the response of CRAs to relevant environments can be predicted. CSI is determined by: (1) estimation of thermoequilibrium surface coverages of O and Cl by a Langmuir isotherm model using adsorption energies of different species (O, Cl, OH, H 2 O) obtained from DFT. (2) determination of CSI by integrating Cl surface coverage over a realistic window of applied potentials, thereby incorporating the effect of Cl surface coverage and electrochemical environment simultaneously. A series of Ni-Cr-X alloys was used as an example to develop and validate the method through studying the effect of different alloy solutes X on chloride resistance. The trends and relations predicted by CSI are in qualitative agreements with experimental observations. Moreover, a quantitative correlation is found between CSI and the repassivation potential.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

First-Principles Modeling of the Repassivation of Corrosion Resistant Alloys: Part II. Surface Adsorption Isotherms for Alloys and the Chloride Susceptibility Index

Ke¹,

Li²,

Lü³

et al. 2020

J. Electrochem. Soc.

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“…The ones specific for the 2XXX alloys are: θ (Al 2 Cu) and S (Al 2 MgCu). They both influence the corrosion behaviour of the 2024 alloy; however, the latter is more important [6]. The mechanism of the corrosion of the alloy was mainly investigated in the neutral solutions containing Cl − .…”

Section: Introductionmentioning

confidence: 99%

The replacement of chromate by molybdate in phosphoric acid-based etch solutions for aluminium alloys

Dychtoń

Kwolek

2018

Corrosion Engineering, Science and Technology

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Corrosion inhibition of aluminium alloys in the acidic solutions is important in the aluminium finishing industry (stripping solutions for anodic films). Sodium molybdate is a potential replacement for chromate-containing species used in the stripping solutions. It was tested as the corrosion inhibitor of 2024 aluminium alloy in orthophosphoric acid solutions. A corrosion rate of the alloy as a function of an initial concentration of sodium molybdate and temperature was determined by using gravimetric and gasometric methods. The corrosion rate was significantly lower in the solutions containing over 5 mM of sodium molybdate when compared to the uninhibited solution. The inhibition efficiency decreased with the increase of the temperature for the constant concentration of sodium molybdate. Sodium molybdate reduced the corrosion of the alloy by adsorption as well as formation of insoluble corrosion products on the alloy.

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Corrosion Failure of the Rocky Point Viaduct

Cited by 2 publications

References 9 publications

First-Principles Modeling of the Repassivation of Corrosion Resistant Alloys: Part II. Surface Adsorption Isotherms for Alloys and the Chloride Susceptibility Index

First-Principles Modeling of the Repassivation of Corrosion Resistant Alloys: Part II. Surface Adsorption Isotherms for Alloys and the Chloride Susceptibility Index

The replacement of chromate by molybdate in phosphoric acid-based etch solutions for aluminium alloys

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