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Materials 2016, 9(11), 925; doi:10.3390/ma9110925

Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy

1
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic
2
Institute of Physics of Materials, Academy of Sciences of the Czech Republic v. v. i., Žižkova 22, Brno 616 62, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Regine Willumeit-Römer
Received: 15 September 2016 / Revised: 3 November 2016 / Accepted: 10 November 2016 / Published: 15 November 2016
(This article belongs to the Special Issue Degradable Biomaterials Based on Magnesium Alloys)
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Abstract

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. View Full-Text
Keywords: AZ91 magnesium alloy; cathodic polarization curve; anodic polarization curve; linear polarization curve AZ91 magnesium alloy; cathodic polarization curve; anodic polarization curve; linear polarization curve
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Tkacz, J.; Minda, J.; Fintová, S.; Wasserbauer, J. Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy. Materials 2016, 9, 925.

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