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

Producción científica: Article › revisión exhaustiva

37 Citas (Scopus)

Resumen

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.

Idioma original	English
Páginas (desde-hasta)	C520-C529
Publicación	Journal of the Electrochemical Society
Volumen	166
N.º	14
DOI	https://doi.org/10.1149/2.0911914jes
Estado	Published - 2019

Nota bibliográfica

Publisher Copyright:
© The Author(s) 2019.

Financiación

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. 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.

Financiadores	Número del financiador
U.S. Government
National Science Foundation Arctic Social Science Program	0639163
DEVCOM Army Research Laboratory	W911NF-14-2-0004

ODS de las Naciones Unidas

Este resultado contribuye a los siguientes Objetivos de Desarrollo Sostenible

Affordable and clean energy

ASJC Scopus subject areas

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

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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.",

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AU - Yang, Zi

AU - Hwang, Jinwoo

AU - Buchheit, Rudolph

PY - 2019

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