Passivation and Performance of Inorganic Aqueous Solutions in a Grooved Aluminum Flat Heat Pipe

Stubblebine, Michael J.; Catton, I.

doi:10.1115/1.4029694

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…According to Pourbaix diagram at different temperatures, metals become more stable in acid solution at high temperatures. 30,49,50 The inconsistency between CSI and experimental assessments of the influence of temperature on localized corrosion might also be the result of properties like pitting potential and repassivation potential being measured from kinetic processes, while CSI is a thermodynamic property. Temperature plays more of a role in the kinetic process of breakdown and repassivation than in the thermodynamic stability of different phases.…”

Section: Pourbaix Diagrammentioning

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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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: Pourbaix Diagrammentioning

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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Designer fluid performance and inclination angle effects in a flat grooved heat pipe

Supowit

Heflinger

Stubblebine

et al. 2016

Applied Thermal Engineering

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A new method for evaluating heat pipe fluid compatibility

Stubblebine¹,

Yao²,

Supowit³

et al. 2016

Applied Thermal Engineering

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While heat pipes are a widely used and highly efficient means of spreading heat or transferring it from one location to another, there are some fluid-casing combinations which cannot be used due to material incompatibilities. These incompatibilities generally result in the generation of non-condensable gases such as the hydrogen gas produced when water is used with aluminum devices. Some attempts at using inhibitors in aqueous solution are found in literature but a method for screening which inhibitors to use that can also predict and assess the performance of different concentrations is not available. Using a thermodynamic approach, principles of corrosion engineering have been applied to the specific application of phase change heat transfer devices. Experimental data from previous tests has been used to show the E-pH diagrams match the reported NCG generation observed experimentally. Using thermodynamic equilibrium diagrams and measurements of heat pipe fluid E and pH can be a valuable tool when investigating passivating fluids for previously incompatible fluid-casing combinations.

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Passivation and Performance of Inorganic Aqueous Solutions in a Grooved Aluminum Flat Heat Pipe

Cited by 9 publications

References 14 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

Designer fluid performance and inclination angle effects in a flat grooved heat pipe

A new method for evaluating heat pipe fluid compatibility

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