A comparision between the oxygen reduction rates on zinc in the active and passive state

S. Thomas; I S Cole; N. Birbilis

A comparision between the oxygen reduction rates on zinc in the active and passive state

S. Thomas, I S Cole, N. Birbilis

Materials Science & Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

Abstract

The oxygen consumption by zinc, due to the oxygen reduction reaction (ORR), was measured using a Pt microelectrode, operating in a redox completion mode. These experiments were performed on zinc anodically polarised, in solutions with pH 7 (active state) and pH 13 (passive state). In the electrode potential range -1.05 VSCE to -0.5 VSCE, the anodic currents in the pH 7 solution (range: 2.5-7.5 mA/cm²) are higher than that in a pH 13 solution (range: 0.01 to 0.5 mA/cm²). In the pH 7 solution, when anodically polarised, the oxygen concentration measured (using the Pt microelectrode) at a 50 micron distance from the zinc surface is 15-60% of the bulk oxygen concentration. Therefore at the same position, the oxygen consumption by zinc (due to ORR), is between 40-85% of the bulk oxygen concentration. In a pH 13 solution, as zinc becomes passive, the oxygen consumption by zinc (due to ORR) is around 70-80% of the bulk oxygen concentration. The rate of ORR on zinc oxides (ZnO/Zn(OH)₂) is therefore significant when compared to actively corroding zinc.

Original language	English
Title of host publication	Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013
Subtitle of host publication	Brisbane, Australia; 10-13 November 2013
Place of Publication	Kerrimuir VIC Australia
Publisher	Australasian Corrosion Association (ACA)
Pages	689-696
Number of pages	8
ISBN (Electronic)	9781634394369
Publication status	Published - 2013
Event	Australasian Corrosion Association (ACA) Conference 2013: Corrosion and Prevention - Brisbane, Australia Duration: 10 Nov 2013 → 13 Nov 2013

Conference

Conference	Australasian Corrosion Association (ACA) Conference 2013
Abbreviated title	CP 2013
Country/Territory	Australia
City	Brisbane
Period	10/11/13 → 13/11/13

Keywords

Oxygen reduction reaction
Passivity
Pt microelectrode
SECM
Zinc

Cite this

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title = "A comparision between the oxygen reduction rates on zinc in the active and passive state",

abstract = "The oxygen consumption by zinc, due to the oxygen reduction reaction (ORR), was measured using a Pt microelectrode, operating in a redox completion mode. These experiments were performed on zinc anodically polarised, in solutions with pH 7 (active state) and pH 13 (passive state). In the electrode potential range -1.05 VSCE to -0.5 VSCE, the anodic currents in the pH 7 solution (range: 2.5-7.5 mA/cm2) are higher than that in a pH 13 solution (range: 0.01 to 0.5 mA/cm2). In the pH 7 solution, when anodically polarised, the oxygen concentration measured (using the Pt microelectrode) at a 50 micron distance from the zinc surface is 15-60\% of the bulk oxygen concentration. Therefore at the same position, the oxygen consumption by zinc (due to ORR), is between 40-85\% of the bulk oxygen concentration. In a pH 13 solution, as zinc becomes passive, the oxygen consumption by zinc (due to ORR) is around 70-80\% of the bulk oxygen concentration. The rate of ORR on zinc oxides (ZnO/Zn(OH)2) is therefore significant when compared to actively corroding zinc.",

keywords = "Oxygen reduction reaction, Passivity, Pt microelectrode, SECM, Zinc",

author = "S. Thomas and Cole, \{I S\} and N. Birbilis",

year = "2013",

language = "English",

pages = "689--696",

booktitle = "Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013",

publisher = "Australasian Corrosion Association (ACA)",

address = "Australia",

note = "Australasian Corrosion Association (ACA) Conference 2013 : Corrosion and Prevention, CP 2013 ; Conference date: 10-11-2013 Through 13-11-2013",

}

Thomas, S, Cole, IS & Birbilis, N 2013, A comparision between the oxygen reduction rates on zinc in the active and passive state. in Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013: Brisbane, Australia; 10-13 November 2013., 120, Australasian Corrosion Association (ACA), Kerrimuir VIC Australia, pp. 689-696, Australasian Corrosion Association (ACA) Conference 2013, Brisbane, Queensland, Australia, 10/11/13.

A comparision between the oxygen reduction rates on zinc in the active and passive state. / Thomas, S.; Cole, I S; Birbilis, N.
Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013: Brisbane, Australia; 10-13 November 2013. Kerrimuir VIC Australia: Australasian Corrosion Association (ACA), 2013. p. 689-696 120.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

TY - GEN

T1 - A comparision between the oxygen reduction rates on zinc in the active and passive state

AU - Thomas, S.

AU - Cole, I S

AU - Birbilis, N.

PY - 2013

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N2 - The oxygen consumption by zinc, due to the oxygen reduction reaction (ORR), was measured using a Pt microelectrode, operating in a redox completion mode. These experiments were performed on zinc anodically polarised, in solutions with pH 7 (active state) and pH 13 (passive state). In the electrode potential range -1.05 VSCE to -0.5 VSCE, the anodic currents in the pH 7 solution (range: 2.5-7.5 mA/cm2) are higher than that in a pH 13 solution (range: 0.01 to 0.5 mA/cm2). In the pH 7 solution, when anodically polarised, the oxygen concentration measured (using the Pt microelectrode) at a 50 micron distance from the zinc surface is 15-60% of the bulk oxygen concentration. Therefore at the same position, the oxygen consumption by zinc (due to ORR), is between 40-85% of the bulk oxygen concentration. In a pH 13 solution, as zinc becomes passive, the oxygen consumption by zinc (due to ORR) is around 70-80% of the bulk oxygen concentration. The rate of ORR on zinc oxides (ZnO/Zn(OH)2) is therefore significant when compared to actively corroding zinc.

AB - The oxygen consumption by zinc, due to the oxygen reduction reaction (ORR), was measured using a Pt microelectrode, operating in a redox completion mode. These experiments were performed on zinc anodically polarised, in solutions with pH 7 (active state) and pH 13 (passive state). In the electrode potential range -1.05 VSCE to -0.5 VSCE, the anodic currents in the pH 7 solution (range: 2.5-7.5 mA/cm2) are higher than that in a pH 13 solution (range: 0.01 to 0.5 mA/cm2). In the pH 7 solution, when anodically polarised, the oxygen concentration measured (using the Pt microelectrode) at a 50 micron distance from the zinc surface is 15-60% of the bulk oxygen concentration. Therefore at the same position, the oxygen consumption by zinc (due to ORR), is between 40-85% of the bulk oxygen concentration. In a pH 13 solution, as zinc becomes passive, the oxygen consumption by zinc (due to ORR) is around 70-80% of the bulk oxygen concentration. The rate of ORR on zinc oxides (ZnO/Zn(OH)2) is therefore significant when compared to actively corroding zinc.

KW - Oxygen reduction reaction

KW - Passivity

KW - Pt microelectrode

KW - SECM

KW - Zinc

UR - https://www.scopus.com/pages/publications/84914673231

M3 - Conference Paper

AN - SCOPUS:84914673231

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EP - 696

BT - Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013

PB - Australasian Corrosion Association (ACA)

CY - Kerrimuir VIC Australia

T2 - Australasian Corrosion Association (ACA) Conference 2013

Y2 - 10 November 2013 through 13 November 2013

ER -

A comparision between the oxygen reduction rates on zinc in the active and passive state

Abstract

Conference

Keywords

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Cite this