Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy
Porovnání elektrochemických metod pro hodnocení lité hořčíkové slitiny AZ91
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Linear polarization is a potentiodynamic method used for electrochemical characterization of materials. Obtained values of corrosion potential and corrosion current density offer information about material behavior in corrosion environments from the thermodynamic and kinetic points of view, respectively. The present study offers a comparison of applications of the linear polarization method (from 100 mV to +200 mV vs. EOCP), the cathodic polarization of the specimen (100 mV vs. EOCP), and the anodic polarization of the specimen (+100 mV vs. EOCP), and a discussion of the differences in the obtained values of the electrochemical characteristics of cast AZ91 magnesium alloy. The corrosion current density obtained by cathodic polarization was similar to the corrosion current density obtained by linear polarization, while a lower value was obtained by anodic polarization. Signs of corrosion attack were observed only in the case of linear polarization including cathodic and anodic polarization of the specimen.
KeywordsAZ91 magnesium alloy, cathodic polarization curve, anodic polarization curve, linear polarization curve, Hořčíková slitina AZ91, katodická polarizační křivka, anodická polarizační křivka, lineární polarizační křivka
Document typePeer reviewed
Document versionFinal PDF
SourceMaterials . 2016, vol. 11, issue 9, p. 1-14.