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overpotential

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Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0006547
EISBN: 978-1-62708-183-2
... Abstract Overpotential is the current-producing potential difference between a nonequilibrium electrode potential and its corresponding equilibrium value for an electrode reaction. This article provides information on overpotential of an electrode reaction. It contains a table that lists...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006679
EISBN: 978-1-62708-213-6
.../deposition currents. where I is the current, I 0 is the exchange current, F is the Faraday constant, R is the gas constant, T is the absolute temperature, and α is the transfer or symmetry coefficient. The term η is the overpotential (Δ U ) defined by: (Eq 8) η = V – U 0 where...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0006540
EISBN: 978-1-62708-183-2
... thermodynamic driving force Δ G Gibbs free energy Δ G o standard Gibbs free energy Δ H change in enthalpy Δ K stress-intensity factor range Δ S entropy change ε p plastic strain range ε t total strain range η overpotential μm...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003830
EISBN: 978-1-62708-183-2
... coatings for corrosion protection of steel are the favorable position in the electromotive force (emf) fast series, dissolution/deposition kinetics, large overpotential for hydrogen evolution, and formation of a porous, tenacious corrosion product film ( Ref 2 ). The favorable position in the (emf) series...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003837
EISBN: 978-1-62708-183-2
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005683
EISBN: 978-1-62708-198-6
... condition of an overpotential (potential difference E − E o ), positive or negative, and is said to be polarized. When a reaction is polarized in the positive (anodic) direction, the oxidation (anodic) rate is higher than at equilibrium, while the reduction (cathodic) rate is lower, and vice versa. Thus...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005653
EISBN: 978-1-62708-198-6
.... 5 , ρ is the oxide film density, V is the volume of film removed, n is the charge per cation, F is Faraday's constant (96,480 C/mol), Mw is the molecular weight of the oxide, i odiss is the dissolution exchange current density, η is the overpotential for active dissolution, A o is the...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003836
EISBN: 978-1-62708-183-2
... constant extension-rate tensile tests and constant strain tests ( Ref 124 ). Stress-corrosion cracking occurred at the corrosion potential and anodic overpotentials, and slight cathodic polarization prevented SCC. Examination of the fracture surfaces led to the conclusion that localized corrosion enhances...