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

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

doi:10.1149/2.0911914jes

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 journal › Article › peer-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 language	English
Pages (from-to)	C520-C529
Journal	Journal of the Electrochemical Society
Volume	166
Issue number	14
DOIs	https://doi.org/10.1149/2.0911914jes
State	Published - 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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10.1149/2.0911914jes

Cite this

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title = "Corrosion inhibition of AZ31 Mg alloy by aqueous selenite (SeO3 2−)",

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.",

author = "Zhiyuan Feng and Belinda Hurley and Menglin Zhu and Zi Yang and Jinwoo Hwang and Rudolph Buchheit",

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: {\textcopyright} The Author(s) 2019.",

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AU - Hurley, Belinda

AU - Zhu, Menglin

AU - Yang, Zi

AU - Hwang, Jinwoo

AU - Buchheit, Rudolph

N1 - 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.

PY - 2019

Y1 - 2019

N2 - 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.

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