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half-cell reaction

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... Abstract This chapter lays the groundwork for understanding electrode kinetics associated with corrosion. It presents a simple but useful theory relating kinetics to the polarization behavior of half-cell reactions. The theory is based on the observation that electrode potentials vary...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... corrosion rate current density electrode half-cell reaction polarization If two or more electrochemical half-cell reactions can occur simultaneously at a metal surface, the metal acts as a mixed electrode and exhibits a potential relative to a reference electrode that is a function...
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Published: 01 July 2000
Fig. 2.4 Abbreviated cell representation showing E cell and half-cell reactions More
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Published: 01 July 2000
Fig. 2.1 The electrochemical cell with iron and hydrogen half-cell reactions More
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Published: 01 July 2000
Fig. 2.5 Abbreviated cell representation showing current flow when the half-cell reactions are coupled More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
... energies of formation are determined using the oxidation of iron as an example. It then considers how iron reacts with hydrochloric acid, explaining how it can be expressed as two half reactions modeled as electrodes in an electrochemical cell. It goes on to describe the chemical reactions occurring...
Image
Published: 01 July 2000
Fig. 3.1 Polarization curves illustrating charge-transfer polarization (Tafel behavior) for a single half-cell reaction. (a) Anodic polarization. (b) Cathodic polarization. (c) Both anodic and cathodic polarization More
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Published: 01 July 2000
Fig. 1.7 Ranges of half-cell potentials of some electrochemical reactions of importance in corrosion. Vertical bars represent metal ion concentration of 1 molal (approximately 10%) down to 1 ppm. Dashed extensions may apply with precipitated and complexing species. The hydrogen and oxygen More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... in an electrochemical cell. As described in the second half of this chapter (see the section “ The Kinetics of Aqueous Corrosion ”), these concepts include anodic and cathodic reactions, the mixed-potential theory, and the exchange currents. The Thermodynamics of Aqueous Corrosion Thermodynamics is a powerful...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730129
EISBN: 978-1-62708-283-9
.... It gives the electrode potentials for various possible half reactions for solutions with 1 molar concentration. Electromotive series Table 12.1 Electromotive series Anode half-cell reaction (the arrows are reversed for the cathode half-cell reaction) Electrode potential used by electrochemists...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
... of the polarization curve, which results from the polarization curves for the individual anodic and cathodic half-cell reactions occurring on the metal surface. These individual polarization curves, assuming Tafel behavior in all cases, are shown in Fig. 6.2 (dashed curves) with E corr and the corrosion current, I...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... would be reversed and thus so would the anode and cathode of the cell. It is useful to list reduction potentials for half-cell reactions, just as it is useful to list free energy data. However, half-cell potentials (like any electrical potentials) cannot be measured in an absolute sense; only...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... or electrons). These limiting potentials are referred to as equilibrium half-cell potentials , and when conditions of concentration and temperature are standardized, they characterize the standard equilibrium half-cell reactions to which they relate. Equations 1.16 and 1.17 , therefore, indicate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
Image
Published: 01 July 2000
Fig. 5.4 Representative polarization curve for iron in buffered solution of pH = 7. Dashed curve extends to the half-cell potential of iron with a Fe 2+ = 10 –6 . Letters along curves relate to reactions (details can be found in the text) that are dominant in the associated potential range. More
Image
Published: 01 July 2000
Fig. 3.21 Anodic and cathodic polarization curves for nitrite ion on platinum. Assumed reduction reaction is a NO 2 − + 8 H + + 6 e → NH 4 + + 2 H 2 O . Equilibrium half-cell potential corresponds to a NO 2 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310019
EISBN: 978-1-62708-286-0
... as overpotentials η, which are defined by the deviation from the equilibrium half-cell potentials, that is, for the cathode, η c = E cathode − E O2/OH and for the anode, η a = E anode – E Fe 2 + Fe . Effectively, the overpotential reduces the activation energy for the electrode Reactions 3 and 4...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910497
EISBN: 978-1-62708-250-1
... products and reactions are at unit activity on a scale in which the potential for the standard hydrogen half-cell is zero. stray-current corrosion. Corrosion resulting from direct current flow through paths other than the intended circuit. For example, by an ex- traneous current in the earth. stress...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2