Depassivation of iron by straining and by abrasion: an A.C. impedance study

Keddam, M.; Oltra, R.; Colson, J.C.; Desestret, A.

doi:10.1016/0010-938x(83)90072-0

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…As shown by other researchers, a current will flow from the surrounding passive surface to the damaged surface when the surface is scratched. [14][15][16]29 This electric coupling tends to decrease the maximum current density, i m , and decrease the repassivation rate (increase n). Since the static load procedure was much slower (lasting about 1 s compared to 3 ms for the bounce test), there was more time for current to flow between the scratched surface and the passive surface.…”

Section: Results Of the Deconvolutionsmentioning

confidence: 99%

“…The effect of the local cells has been analyzed by other researchers. [14][15][16]29 Their analyses showed the local cells caused the current passing through the scratch to differ from the current measured by the external circuit. Upon scratching the surface, there was a rapid discharge of the capacitance of the passive film near the scratch.…”

Section: Analysis Of the Current Transientsmentioning

confidence: 99%

“…The combined effects of corrosion and wear involved the removal of the passive film during the wear process and the regrowth of the passive film. The process of removal (or disruption) and regrowth has been studied using several methods in the past, including scratch, 1-7 scraping, [8][9][10] straining, [11][12][13] erosion, [14][15][16] abrasion, [17][18][19] and fracture. 20,21 Reformation of the passive film was measured by recording the current that resulted when a bare surface was formed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Repassivation of 304 Stainless Steel Investigated with a Single Scratch Test

Adler¹,

Walters²

1993

CORROSION

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Reformation of the passive film on 304 stainless steel (UNS S 30400) was investigated with a scratch test. Regrowth of the passive film was measured by recording the current that resulted from forming the scratch. Charge consumed during the reformation of the film was compared to wear produced by the scratch. The current density from an incremental area of the scratch was extracted from the measured current transients using the width of the scratch as a function of time. The maximum current density and the charge density were dependent linearly on the area fraction of bare surface. Other parameters used in the model of current transients did not change as the area fraction of bare surface changed. Results showed the passive film remained adherent to the surface of the stainless steel during the rubbing mode of wear.

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Section: Results Of the Deconvolutionsmentioning

confidence: 99%

Section: Analysis Of the Current Transientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Repassivation of 304 Stainless Steel Investigated with a Single Scratch Test

Adler¹,

Walters²

1993

CORROSION

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“…The application of potentiostatic and potentiodynamic polarization in tribocorrosion studies, although not standardized, has been well documented [3,5]. In contrast, the use of methods such as electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN), the latter especially promising in shedding light on the tribocorrosion of multiphase alloys, has not been formalized yet [16][17][18][19]. Also, well-researched tribo-electrochemical techniques able to measure in situ localized phenomena are lacking [11].…”

Section: Introductionmentioning

confidence: 99%

Three-Body Abrasion Corrosion Studies of High-Cr Cast Irons: Benefits and Limitations of Tribo-electrochemical Methods

Salasi

Stachowiak

2015

J Bio Tribo Corros

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High-Cr white cast irons (WCIs) are multiphase alloys commonly used in aqueous industrial environments in applications that require both high abrasion and high corrosion resistance. Various electrochemical techniques can be useful in elucidating tribocorrosion characteristics of metallic materials undergoing wear in a corrosive environment. This study is focused on the interpretation of electrochemical measurements applied to three-body abrasion corrosion contacts of high-Cr WCIs. Particular attention has been paid to determine whether tribo-electrochemical data can pick up any effects that the multiphase microstructure of WCIs may have on the tribocorrosion characteristics, especially in environments containing chloride ions. Since both wear and corrosion of multiphase alloys are usually not uniform, their tribocorrosion behaviour is difficult to study and is still poorly understood. The experimental results are discussed in terms of benefits and limitations of tribo-electrochemical techniques such as polarization (potentiostatic, potentiodynamic) and electrochemical noise (galvanic coupling, potentiostatic) in studying abrasion corrosion behaviour of high-Cr WCIs. The application of high-resolution surface analysis techniques (microprobe, NanoSIMS, C-AFM and SKPFM), used in support of the electrochemical data interpretation, is also demonstrated.

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“…From impedance measurements, Keddam et al. [7] have compared, the anodic current transients produced by straining and abrasion. They have suggested that the mechanical behaviour of the passive film formed on iron in sulfuric acid is ductile.…”

Section: Introductionmentioning

confidence: 99%