Accurate Electrochemical Measurement of Magnesium Corrosion Rates; a Combined Impedance, Mass-Loss and Hydrogen Collection Study

By A. D. King, Nick Birbilis, J. Scully. 2014

582 citations recorded by the source corpus.

Abstract Experiments were conducted to enable the simultaneous measurement of electrochemical impedance and collection of hydrogen gas during the corrosion of pure magnesium in NaCl solutions. These results were then assessed along with the attendant specimen mass loss, providing three unique measures of magnesium corrosion for the same specimen. It was determined that analysis of impedance data, while accounting for a physically justified inductive response at low frequencies, enabled the determination of the polarization resistance, RP at the zero frequency limit. The determination of RP, as evaluated herein from electrochemical testing, provided excellent correlation to the mass loss and volume of hydrogen collected. This finding is elaborated in a broader discussion that critically addresses previous studies which have utilized the impedance behavior of magnesium and which claim electrochemical tests may underestimate Mg corrosion when attempting to use a charge transfer resistance at intermediate frequencies.

Subfields: Biomaterials, Materials Chemistry, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/8088bce89264b71790bcfc6f41d0797362bcf9b3

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Citations in the corpus

Electrochemical Impedance Spectroscopy for the Measurement of the Corrosion Rate of Magnesium Alloys: Brief Review and Challenges (2020, methodology): “While the polarization curves of Mg/Mg alloys have well-defined cathodic branches and the βc can be measured relatively easily [106,107], oftentimes, there is no reasonable linearity of the anodic parts of the polarization curves [9,19].”
Comprehensive screening of Mg corrosion inhibitors (2017, background): “Besides, hydrogen evolution measurements usually correlate well with the weight loss measurement for Mg materials because one mole of dissolved magnesium generates one mole of hydrogen gas [38].”
Fundamentals and advances in magnesium alloy corrosion (2017, methodology): “1 M NaCl solution exhibiting an inductive-type behavior at low frequency values [54].”