TITLE

Electrochemical Behaviour of Al, Al–In and Al–Ga–In Alloys in Chloride Solutions Containing Zinc Ions

AUTHOR(S)
El Abedin, S. Zein; Endres, F.
PUB. DATE
October 2004
SOURCE
Journal of Applied Electrochemistry;Oct2004, Vol. 34 Issue 10, p1071
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
electrochemical behaviour of Al, Al-In and Al-Ga-In alloys in 0.6 M NaCl solutions with and without Zn2+ was investigated. The study was performed by means of open circuit potential, potentiodynamic polarization, potentiostatic current-time and electrochemical impedance spectroscopy measurements as well as by SEM-EDAX examination. It was found that the Al-In alloy exhibits the highest negative open circuit potential in 0.6 M NaCl and the corrosion resistance of the tested electrodes decreases in the following order: Al > Al-Ga-In > Al-In. The greater activity of the Al-In alloy was interpreted on the basis of the autocatalytic attack by indium. The potentiostatic current-time measurements in Zn2+ containing electrolyte at potentials above the pitting potential revealed that Zn2+ has an insignificant influence on the Al electrode, while it enhances the corrosion of the Al-Ga- In alloy and improves the attack morphology of the Al-In alloy. Furthermore, the impedance spectra recorded under open circuit conditions showed a decrease in the polarization resistance of Al-In and Al-Ga-In alloys in presence of Zn2+ indicating the activating effect of Zn2+ ions.
ACCESSION #
14526782

 

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