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

0467734 - ÚFM 2017 RIV CH eng J - Journal Article
Tkacz, J. - Minda, J. - Fintová, Stanislava - Wasserbauer, J.
Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy.
Materials. Roč. 9, č. 11 (2016), č. článku 925. E-ISSN 1996-1944
Institutional support: RVO:68081723
Keywords : AZ91 magnesium alloy * cathodic polarization curve * anodic polarization curve * linear polarization curve
Subject RIV: JK - Corrosion ; Surface Treatment of Materials
Impact factor: 2.654, year: 2016
http://www.mdpi.com/1996-1944/9/11/925

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.
Permanent Link: http://hdl.handle.net/11104/0265781