Local Electrochemical Studies and Surface Analysis on Worn Surfaces

Krawiec, H.; Vignal, V.; Heintz, O.; Ponthiaux, Pierre; Wenger, F.

doi:10.1149/1.2830954

Cited by 31 publications

(10 citation statements)

References 19 publications

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“…In reality, local variations in galvanic current can be expected due to the deformed state of the rubbed metal. Indeed, H. Krawiec et al [20] observed, using SRET, heterogeneities in anodic current distribution within wear tracks formed on stainless steel.…”

Section: A Galvanic Cell Model For Tribocorrosion At Open Circuit Potmentioning

confidence: 99%

Mechanical and electrochemical deterioration mechanisms in the tribocorrosion of Al alloys in NaCl and in NaNO3 solutions

et al. 2012

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Tribocorrosion of Al-Si-Cu-Mg alloys was investigated in 0.05 M NaCl and 0.1 M NaNO3 solutions under severe sliding and controlled electrochemical conditions. A simple galvanic coupling model was developed to analyze and quantitatively predict the evolution potential of the open circuit potential during tribocorrosion. According to this model and the obtained results, galvanic coupling was established in the NaNO3 solution within the wear track between passive and mechanically depassivated areas. In the NaCl solution, galvanic coupling was established between the whole depassivated wear track and the surrounding area. This difference was attributed to different mechanical properties of the passive surfaces.

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Section: A Galvanic Cell Model For Tribocorrosion At Open Circuit Potmentioning

confidence: 99%

Mechanical and electrochemical deterioration mechanisms in the tribocorrosion of Al alloys in NaCl and in NaNO3 solutions

et al. 2012

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“…In reality, much localized variations in galvanic current can be expected because of the deformed state of the rubbed metal. Indeed, Krawiec et al [19] observed, using SVET, heterogeneities in anodic current distribution within wear tracks formed on stainless steel. The relation between cathode potential E c and the current density i c can be determined empirically by a Tafel extrapolation of the linear part of the cathodic branch of the polarization curve:…”

Section: Galvanic Cell Model For Tribocorrosion At Openmentioning

confidence: 99%

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Papageorgiou

Mischler

2012

Tribol Lett

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Valuable insights into the wear-corrosion behavior of metals, as well as into the tribocorrosion field through the development of simulation models of tribocorrosion experiments, can contribute in rationalizing wearaccelerated experiments and their open circuit potential (OCP) behavior under rubbing. These results demonstrate that mathematical models of controlled tribo-electrochemical contacts can complement the physical experiment and add valuable understanding to the tribological behavior of metals, alloys, and generally to materials in an electrochemically active environment. The excellent agreement of experimental wear data and the experimental OCP curves with the OCP simulations with time establishes the concepts underlying the galvanic coupling model as a valid methodological approach toward a quantitative description and mechanistic understanding of the tribo-electrochemical experiment. Besides analyzing stellite tribocorrosion, application of the model to Al alloy data has helped us quantify the relative contributions of chemical and mechanical wear and reveal the underlying synergy. Ti metal tribocorrosion under variable load has revealed that the contact pressure P av , can reach much lower values within the experimental time domain and finally be the cause of interruption of the initial wear mechanism.

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“…In corrosion studies, SECM offers an arsenal of modes for the direct detection of ionic/molecular uxes produced at the corroding interface, 3 to probe corrosion mechanisms, 4 coatings 5,6 and surface modications. 7 Recently, the potentiometric, 8,9 feedback, 10,11 and generation-collection modes 10,[12][13][14] of SECM have been applied to study the corrosion of Mg alloys which, given their light-weight properties and low cost, are of interest for automotive applications. 15 An important challenge when performing such SECM measurements is the ability to decouple and resolve variations in topography in order to quantify local corrosion rates.…”

Section: Introductionmentioning

confidence: 99%

Determination of the local corrosion rate of magnesium alloys using a shear force mounted scanning microcapillary method

et al. 2015

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The successful development of scanning probe techniques to characterize corrosion in situ using multifunctional probes is intrinsically tied to surface topography signal decoupling from the measured electrochemical fluxes. One viable strategy is the shear force controlled scanning microcapillary method. Using this method, pulled quartz micropipettes with an aperture of 500 nm diameter were used to resolve small and large variations in topography in order to quantify the local corrosion rate of microgalvanically and galvanically corroded Mg alloys. To achieve topography monitoring of corroded surfaces, shear force feedback was employed to position the micropipette at a reproducible working height above the substrate. We present proof of concept measurements over a galvanic couple of a magnesium alloy (AE44) and mild steel along with a microgalvanically corroded ZEK100 Mg alloy, which illustrates the ability of shear force to track small (1.4 μm) and large (700 μm) topographic variations from high aspect ratio features. Furthermore, we demonstrate the robustness of the technique by acquiring topographic data for 4 mm along the magnesium-steel galvanic couple sample and a 250 × 30 μm topography map over the ZEK100 Mg alloy. All topography results were benchmarked using standard optical microscopies (profilometry and confocal laser scanning microscopy).

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Local Electrochemical Studies and Surface Analysis on Worn Surfaces

Cited by 31 publications

References 19 publications

Mechanical and electrochemical deterioration mechanisms in the tribocorrosion of Al alloys in NaCl and in NaNO3 solutions

Mechanical and electrochemical deterioration mechanisms in the tribocorrosion of Al alloys in NaCl and in NaNO3 solutions

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Determination of the local corrosion rate of magnesium alloys using a shear force mounted scanning microcapillary method

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