Metallurgical factors influencing the corrosion of aluminum, Al-Cu, and Al-Si alloy thin films in dilute hydrofluoric solution

Scully, John R.; Peebles, D.E.; Romig, A. D.; Frear, D. R.; Hills, C. R.

doi:10.1007/bf02658068

Cited by 56 publications

(45 citation statements)

References 41 publications

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“…ETRs on this Al oxide are not well-supported and the kinetics of ORR decrease with increasing Al oxide thickness. 27 During cathodic polarization, even though the Al oxide film was already thinned by cathodic corrosion, the kinetics of ORR on pure Al and Al-4Cu were still controlled by electron transfer through the Al oxide. On the other hand, the high oxygen reduction rates on Al 2 Cu can be attributed to the Cu content of the surface oxide film.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of conducting metallic Cu 0 was detected in the Al-rich native oxide on Al 2 Cu and Al 2 CuMg. 4,27,28 This metallic Cu 0 in the Al oxide changes the conductivity of the oxide film on Al 2 Cu, and enhances the kinetics of ORR on this phase to the extent that the limiting step of this phase can be mass-transport-limited O 2 reduction.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Quartz Crystal Microbalance Study of Corrosion of Phases in AA2024

Baek¹,

Frankel²

2003

J. Electrochem. Soc.

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The electrochemical quartz crystal microbalance (EQCM) was used to directly measure the dissolution rate at cathodic potentials, and thus the cathodic corrosion rate, of thin-film analogs of phases in AA2024. Thin films of pure Al, Al-4% Cu, and Al 2 Cu were studied in 0.1 M NaCl containing 0, 10 -4 , or 10 -2 M Cr 2 O 7 . A range of cathodic potentials was studied for each material. The true cathodic current density was calculated from the difference of the net current density and the dissolution rate, which was determined by the EQCM. For pure Al and Al-4Cu, the cathodic corrosion rate was large relative to the net current density, so the true cathodic current density was considerably larger than the measured net current density. The cathodic current density was almost identical to the net current density for Al 2 Cu because the dissolution rate was very small compared to the cathodic reaction rate. Various potentials in the limiting oxygen reduction reaction region were examined, but the effect of the applied potential was small. The presence of dichromate in solution decreased both the cathodic corrosion rate and the cathodic current density on these thin-film analogs. In particular, it decreased more effectively the cathodic reaction rate on Al 2 Cu, which can support faster cathodic reaction rates.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrochemical Quartz Crystal Microbalance Study of Corrosion of Phases in AA2024

Baek¹,

Frankel²

2003

J. Electrochem. Soc.

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“…Then, the Cu-rich matrix becomes noble relative to the remote matrix. This leads to galvanic corrosion of matrix areas that are remote from the original particles [78]. Hence, the presence of Cu in IMC particles is detrimental to corrosion resistance, while Cu dissolved in the matrix is beneficial.…”

Section: Al-cu Solid Solutionmentioning

confidence: 99%

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Dang

2017

Metals

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Abstract:The heterogeneous structure of Al alloys renders them susceptible to localized corrosion due to the different electrochemical properties existing in the Al-rich solid solution matrix and secondary phase particles. The galvanic interactions between these two phases can result in pit formation either through dissolution of the particles or corrosion of the matrix adjacent to the particles. This detrimentally localized corrosion behavior is closely related to the corrosion properties of the particles and the Al-rich matrix. The comprehensive characterization of this behavior under various and varying conditions is critical to understanding the mechanism of pit formation, selecting appropriate inhibitors, and developing protection strategies. The corrosion properties (corrosion potential, pitting potential and corrosion rate) of both secondary phase particles and Al-solid solutions in Al alloys are summarized in this review, aiming to provide a database for corrosion research applicable to the localized corrosion of Al alloys.

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“…21 Cu-rich IMC and replated Cu have been shown to contribute significantly to the overall oxygen reduction reaction (ORR) rate on AA2024-T3. 18,[20][21][23][24][25][26][27][28][29] Therefore, a cathodic reaction is readily available from a coating defect in the case of underpaint corrosion to support the operating anodic corrosion process at the head of a coating delamination front.…”

Section: Performing Organization Name(s) and Address(es)mentioning

confidence: 99%

Effect of Surface Pretreatment on the Underpaint Corrosion of AA2024-T3 at Various Temperatures

2006

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Metallurgical factors influencing the corrosion of aluminum, Al-Cu, and Al-Si alloy thin films in dilute hydrofluoric solution

Cited by 56 publications

References 41 publications

Electrochemical Quartz Crystal Microbalance Study of Corrosion of Phases in AA2024

Electrochemical Quartz Crystal Microbalance Study of Corrosion of Phases in AA2024

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Effect of Surface Pretreatment on the Underpaint Corrosion of AA2024-T3 at Various Temperatures

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