Corrosion inhibition of AZ31 Mg alloy by aqueous selenite (SeO3 2−)

Zhiyuan Feng, Belinda Hurley, Menglin Zhu, Zi Yang, Jinwoo Hwang, Rudolph Buchheit

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

An investigation was undertaken to study aqueous selenite as a possible corrosion inhibitor for magnesium alloys. Exposure experiments, anodic and cathodic polarization studies, electrochemical impedance spectroscopy (EIS) studies, morphological analysis, X-ray photoelectron spectroscopy (XPS) and Raman surface analysis were performed on alloy AZ31 during and after exposure in different concentrations of sodium selenite (0.5 mM to 50.0 mM) dissolved in 0.1 M NaCl. Formation of a Se0 film consisting of both amorphous and crystalline Se0 was observed after exposure to solutions independent of the selenite concentration. In the case of the highest concentration, precipitation of MgSeO3 was observed on the surface of the Mg alloy samples. Both anodic and cathodic inhibition was observed across the range of concentrations examined. Cathodic inhibition was observed independent of selenite concentration and appeared to arise from the presence of a surface film formed on both the matrix and on Al-Mn particles that inhibited water reduction. Anodic inhibition in electrochemical measurements was evident at lower selenite concentrations. Characterization of the film morphology suggested that film structure was detrimentally affected as concentration of the inhibitor increased.

Original languageEnglish
Pages (from-to)C520-C529
JournalJournal of the Electrochemical Society
Volume166
Issue number14
DOIs
StatePublished - 2019

Bibliographical note

Funding Information:
This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-14-2-0004. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Purchase of the Ra-man microprobe was supported by the National Science Foundation under grant No. 0639163.

Funding Information:
This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-14-2-0004. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Purchase of the Raman microprobe was supported by the National Science Foundation under grant No. 0639163.

Publisher Copyright:
© The Author(s) 2019.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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