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                <forename type="first">Claude</forename>
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            <idno type="halRefHtml">&lt;i&gt;Matériaux et Techniques&lt;/i&gt;, 2007, 95, pp.385 - 395. &lt;a target="_blank" href="https://dx.doi.org/10.1051/mattech:2008035"&gt;&amp;#x27E8;10.1051/mattech:2008035&amp;#x27E9;&lt;/a&gt;</idno>
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                <term xml:lang="en"> inhibitor</term>
                <term xml:lang="en">Faradic impedance</term>
                <term xml:lang="en"> relaxation</term>
                <term xml:lang="en"> bronze</term>
                <term xml:lang="en"> cultural heritage</term>
                <term xml:lang="fr">relaxation</term>
                <term xml:lang="fr">Impédance faradique</term>
                <term xml:lang="fr">inhibiteur</term>
                <term xml:lang="fr">patrimoine culturel </term>
                <term xml:lang="fr">bronze</term>
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              <p>Electrochemical Impedance spectroscopy applied to the corrosion study. Various applications of the Electrochemical Impedance Spectroscopy over the last 40 years are described. At the beginning of this long history, ac signal has been used simply to determine steady state entity, the polarisation resistance to apply Stern–Geary method. However, it was remarked immediately that the impedance spectrum contains many useful information on the processes taking place at the corroding interface. These processes are revealed by a specific time-constant for each phenomenon, therefore they can be distinguished by analysing the impedance spectrum in the frequency domain. After describing the main difference between the steady-state and impedance methods for the corrosion investigation for the understanding of corrosion mechanism as well as the estimation of corrosion rate, we will show several aspects of the latter method: Electrolyte resistance, protective effect of corrosion inhibitor and the protection of bronze archaeological artefacts covered with patina.</p>
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              <p>Nous allons présenter différentes applications de la spectroscopie d'impédance électrochimique réalisées depuis 40 ans. Au début de cette longue histoire, l'emploi de si-gnaux alternatifs était destiné à remplacer la méthode stationnaire dite de Stern et Geary, c'est-à-dire la mesure de la résistance de polarisation. Cependant, rapidement nous avons constaté que le spectre d'impédance contenait plusieurs informations sur les phénomènes se déroulant à l'interface métal | électrolyte. Ils se manifestent par une constante de temps propre à chaque processus, donc généralement distinguables par une analyse en fréquence. Après avoir présenté la différence majeure entre la méthode stationnaire et la méthode d'impédance dans l'étude de la corrosion à la fois en termes de compréhension des méca-nismes et de prévision de sa vitesse, nous aborderons plusieurs applications de cette der-nière méthode : la résistance d'électrolyte, l'effet protecteur d'inhibiteurs organiques et la protection de bronzes archéologiques recouverts de patine. </p>
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