Quantification of Tafel coefficients according to passive/active state of steel carbonation‐induced corrosion in concrete - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Materials and Corrosion / Werkstoffe und Korrosion Year : 2019

Quantification of Tafel coefficients according to passive/active state of steel carbonation‐induced corrosion in concrete

Abstract

Statistical quantification of Tafel coefficients is investigated in this study for isolated steel rebar embedded in concrete. The survey is supported by a wide experimental campaign carried out earlier to characterize the passive and active states of carbonation‐induced corrosion of steel. Electrochemical measurements (polarization resistance, corrosion potential, Tafel coefficients) and gravimetric estimations of iron loss were regularly conducted over 417 days on 108 concrete specimens. The statistical analysis reveals that the mean value of Tafel coefficients, both cathodic and anodic, is higher under active corrosion, which seems to contradict the general tendency found for chloride‐induced corrosion, while their coefficient of variation is smaller. The statistical inference was based on the first step of distributions fitting the experimental data and then on the second step of goodness‐of‐fit tests. The most suitable of the distributions proposed were the Burr, Rayleigh, and Gamma distributions. A similar analysis was made for the corrosion potential and polarization resistance. The findings of the study will be valuable for probabilistic approaches to corrosion where probabilistic distributions are required.
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Dates and versions

hal-02278758 , version 1 (04-09-2019)

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Frederic Duprat, Thomas de Larrard, Ngoc Tru Vu. Quantification of Tafel coefficients according to passive/active state of steel carbonation‐induced corrosion in concrete. Materials and Corrosion / Werkstoffe und Korrosion, 2019, ⟨10.1002/maco.201910962⟩. ⟨hal-02278758⟩
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