Visualization of Cathode Activity for Fe-Rich and Cu-Rich Intermetallic Particles via Cathodic Corrosion from Dioxygen Reduction at Aluminum Alloy 2024-T3

Jesse C. Seegmiller; Reinaldo C. Bazito; Daniel A. Buttry

doi:10.1149/1.1625592

Visualization of Cathode Activity for Fe-Rich and Cu-Rich Intermetallic Particles via Cathodic Corrosion from Dioxygen Reduction at Aluminum Alloy 2024-T3

Jesse C. Seegmiller, Reinaldo C. Bazito, Daniel A. Buttry

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

A wall-jet flow cell was used to study O₂ reduction at AA2024-T3. In buffered O₂-saturated solution the current density was 2% of the diffusion-limited value and relatively stable with time. In unbuffered solution the current density was 25-50% of the diffusion-limited value. The higher currents under unbuffered conditions are attributed to production of OH^- via O₂ reduction at the intermetallic particles (IPs) at AA2024-T3. Trenching was observed around both Cu-rich and Fe-rich IPs. This cathodic corrosion was observed in the absence of chloride and when the alloy was held potentiostatically at open-circuit potential demonstrating that both types of IPs can act as cathodes toward O₂ reduction under these conditions.

Original language	English (US)
Pages (from-to)	B1-B4
Journal	Electrochemical and Solid-State Letters
Volume	7
Issue number	1
DOIs	https://doi.org/10.1149/1.1625592
State	Published - Feb 9 2004
Externally published	Yes

ASJC Scopus subject areas

Chemical Engineering(all)
Materials Science(all)
Physical and Theoretical Chemistry
Electrochemistry
Electrical and Electronic Engineering

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title = "Visualization of Cathode Activity for Fe-Rich and Cu-Rich Intermetallic Particles via Cathodic Corrosion from Dioxygen Reduction at Aluminum Alloy 2024-T3",

abstract = "A wall-jet flow cell was used to study O2 reduction at AA2024-T3. In buffered O2-saturated solution the current density was 2% of the diffusion-limited value and relatively stable with time. In unbuffered solution the current density was 25-50% of the diffusion-limited value. The higher currents under unbuffered conditions are attributed to production of OH- via O2 reduction at the intermetallic particles (IPs) at AA2024-T3. Trenching was observed around both Cu-rich and Fe-rich IPs. This cathodic corrosion was observed in the absence of chloride and when the alloy was held potentiostatically at open-circuit potential demonstrating that both types of IPs can act as cathodes toward O2 reduction under these conditions.",

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AU - Buttry, Daniel A.

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AB - A wall-jet flow cell was used to study O2 reduction at AA2024-T3. In buffered O2-saturated solution the current density was 2% of the diffusion-limited value and relatively stable with time. In unbuffered solution the current density was 25-50% of the diffusion-limited value. The higher currents under unbuffered conditions are attributed to production of OH- via O2 reduction at the intermetallic particles (IPs) at AA2024-T3. Trenching was observed around both Cu-rich and Fe-rich IPs. This cathodic corrosion was observed in the absence of chloride and when the alloy was held potentiostatically at open-circuit potential demonstrating that both types of IPs can act as cathodes toward O2 reduction under these conditions.

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Visualization of Cathode Activity for Fe-Rich and Cu-Rich Intermetallic Particles via Cathodic Corrosion from Dioxygen Reduction at Aluminum Alloy 2024-T3

Abstract

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