4.6 Article

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

Journal

ELECTROCHIMICA ACTA
Volume 121, Issue -, Pages 394-406

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.124

Keywords

Magnesium; Corrosion; Monitoring; Polarization; Hydrogen Collection; EIS

Funding

  1. US DoD OUSD Corrosion University Pilot Program
  2. National Science Foundation under NSF DMR [0906663]
  3. US Air Force Academy [FA7000-13-2-0020]
  4. Division Of Materials Research
  5. Direct For Mathematical & Physical Scien [0906663] Funding Source: National Science Foundation

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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, R-P at the zero frequency limit. The determination of R-P, 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. (C) 2014 Elsevier Ltd. All rights reserved.

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