On the Shape of Some Polarization Curves in the Vicinity of the Corrosion Potential

Palombarini, G.; Felloni, L.; Cammarota, Gian Paolo

doi:10.5006/0010-9312-29.6.245

Cited by 17 publications

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“…The Bureau of Mines, U.S. Department of the Interior, is conducting corrosion research for the purpose of finding ways to minimize mineral and metal needs. Recent analyses of the error in using the "linear polarization" technique to determine the corrosion current, Ik, from the polarization curve, where the current (i) is plotted vs. potential (~), have concerned the slope of the curve at the corrosion potential, Ck (1)(2)(3)(4)(5)(6). This paper examines several estimates of the slope, including the conventional two-point "linear polarization" equation from the perspective of numerical methods.…”

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confidence: 99%

“…Differentiating with respect to potential and setting Am --0, the theoretical slope of the polarization curve at the corrosion potential, ~k, is 01" 1 9 = 2.3 (l/bh + 1/b~c) [4] 0~ k…”

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confidence: 99%

“…The function sinh(x)/x that appears in this equation but not in Eq. [4] reflects the deviation of Eq. [6c] from the theoretical slope.…”

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confidence: 99%

“…The error term for the three-point equation, obtained by substituting Eq. [4] and [8] into Eq. [9], is given by b~ sinh (Xla)/Xla "~" bla sinh (x2c)/x~c -- [10] bsc "~-bla Since sinh(x)/x ~ I, Eq.…”

mentioning

confidence: 99%

“…[6c] will always be equal to or greater than the theoretical value given by Eq. [4], and the sign and magnitude of the error term will unambiguously be defined by Eq. [10].…”

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confidence: 99%

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Estimation of the Slope of Polarization Curves in the Vicinity of the Corrosion Potential

Cramer

1979

J. Electrochem. Soc.

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Numerical methods were used to derive an improved estimate of the slope of the polarization curve in the vicinity of the corrosion potential. The resulting three'point linear polarization equation has the same form as the conventional two-point equation, but yields a substantially more accurate value for the corrosion current. For JAr I = 10 mV and Tafel constants (bla and b2c) 30 mV or larger, the error in computing the corrosion current from the three-point equation is only 10% or less.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.120.194.195 Downloaded on 2015-02-09 to IP

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confidence: 99%

“…Differentiating with respect to potential and setting Am --0, the theoretical slope of the polarization curve at the corrosion potential, ~k, is 01" 1 9 = 2.3 (l/bh + 1/b~c) [4] 0~ k…”

mentioning

confidence: 99%

“…The function sinh(x)/x that appears in this equation but not in Eq. [4] reflects the deviation of Eq. [6c] from the theoretical slope.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…[6c] will always be equal to or greater than the theoretical value given by Eq. [4], and the sign and magnitude of the error term will unambiguously be defined by Eq. [10].…”

mentioning

confidence: 99%

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Estimation of the Slope of Polarization Curves in the Vicinity of the Corrosion Potential

Cramer

1979

J. Electrochem. Soc.

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Methode und Instrumentierung bei Polarisationwiderstands‐Messungen

Moreland

Rowlands

1977

Materials & Corrosion

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Methode und Instrumentierung bei Polarisationswiderstands-Messungen 249 5. Zusammenfassung i m Rahmen des von der Bundesrepublik Deutschland, dem Land Land Nordrhein-Westfalen und der Schweizerischen Eidgenossenschaft geforderten Entwicklungsprogramms fur ein Kernkraftwerk mit Hochtemperatur-Reaktor und Heliumturbine g r o k r Leistung (HHT) entstanden. Die Entwicklung einer Losung zur gleichzeitigen Dekontaminationsbehandlung verschiedener Werkstoffe in Kernreaktoranlagen setzt die Kenntnis ihres Korrosionsverhaltens voraus. Dieses wird bestimmt durch den aus anodischen und katho-W -1901 dischen Teilreaktionen sich ergebenden Korrosionsmechanismus. Der pH-Wert der Losung kann sowohl die anodische als auch die kathodische Teilreaktion beeinflussen, der Sauerstoffgehalt wirkt rein kathodisch. pH-Wert und Sauerstoffgehalt sind uber den kritischen pH-Wert, der vom Sauerstoffgehalt abhangt , miteinander verknupft. Die Ergebnisse aus elektrochemischen Korrosionsversuchen in Pufferlosungen konnen als Modell dienen, mit dessen Hilfe das Korrosionsverhalten der Werkstoffe in anderen Losungen tendenziell vorausgesagt und gezielt untersucht werden kann. Herrn Prof. Dr. H. Bdhni, ETH Zurich, Jnstitut fur Baustoffe, Werkstoffchemie und Korrosion sei fiir wertvolle Diskussionen gedankt. den Firmen Diese Arbeit ist innerhalb der Zusammenarbeit zwischen Brown Boveri

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DC Electrochemical Techniques for the Measurement of Corrosion Rates

Nagy

1993

Modern Aspects of Electrochemistry

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On the Shape of Some Polarization Curves in the Vicinity of the Corrosion Potential

Cited by 17 publications

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Estimation of the Slope of Polarization Curves in the Vicinity of the Corrosion Potential

Estimation of the Slope of Polarization Curves in the Vicinity of the Corrosion Potential

Methode und Instrumentierung bei Polarisationwiderstands‐Messungen

DC Electrochemical Techniques for the Measurement of Corrosion Rates

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