Investigation on the corrosion and hydrogen evolution for AZ91D magnesium alloy in single and anion-containing oxalate solutions
F. El-Taib Heakal; O.S. Shehata; Noura Saad tantawy; A.M. Fekry;
Abstract
Corrosion characterization of AZ91D alloy was studied in aqueous sodium oxalate solutions
with various concentrations using different electrochemical techniques (open circuit
potential, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)). The
corrosion rate and consequently the rate and extent of hydrogen evolution were found to
increase significantly with increasing oxalate anion concentration and temperature or with
decreasing the pH of solution. Increasing additions of various anions over the lower
concentration range (0.001e1.0 mM) in the blank oxalate solution increases to a varying
extent the corrosion rate of the alloy and hence increases the hydrogen evolution rate and
decreases surface film stability in the following order Cl
> SO4 2
> F . On the other hand,
addition of phosphate anion exhibits a reverse trend, where the active corrosion rate
decreases with increasing PO4 3 anion concentration, implying that this anion acts as
a passivator for AZ91D alloy. The obtained electrochemical results are further confirmed by
scanning electron microscopy (SEM) analysis.
with various concentrations using different electrochemical techniques (open circuit
potential, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)). The
corrosion rate and consequently the rate and extent of hydrogen evolution were found to
increase significantly with increasing oxalate anion concentration and temperature or with
decreasing the pH of solution. Increasing additions of various anions over the lower
concentration range (0.001e1.0 mM) in the blank oxalate solution increases to a varying
extent the corrosion rate of the alloy and hence increases the hydrogen evolution rate and
decreases surface film stability in the following order Cl
> SO4 2
> F . On the other hand,
addition of phosphate anion exhibits a reverse trend, where the active corrosion rate
decreases with increasing PO4 3 anion concentration, implying that this anion acts as
a passivator for AZ91D alloy. The obtained electrochemical results are further confirmed by
scanning electron microscopy (SEM) analysis.
Other data
Title | Investigation on the corrosion and hydrogen evolution for AZ91D magnesium alloy in single and anion-containing oxalate solutions | Authors | F. El-Taib Heakal; O.S. Shehata; Noura Saad tantawy ; A.M. Fekry | Keywords | AZ91D;Oxalate;EIS;CV;SEM | Issue Date | 2012 | Publisher | Elsevier Ltd. | Journal | International Journal of Hydrogen Energy | Volume | 37 | Start page | 84 | End page | 94 |
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