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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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DOI

10.1007/bf02607785

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1433-0768

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Electrochemical behavior of passive films on Al–17

Authors: E E CoralEscobar M A PechCanul M I PechCanul
Publish Date: 2009/05/12
Volume: 14, Issue: 5, Pages: 803-810
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Abstract

The anodic polarization behavior of alloy Al–17Si–14Mg in borate solutions with and without 001 M NaCl was compared to that for pure Al Results showed that for the alloy the passive current density increased but the pitting susceptibility decreased The first effect was ascribed to a significant electrochemical activity of the Mg2Si intermetallics and the second to improved stability of the oxide film Xray photoelectron spectroscopy analysis of potentiostatically formed passive film on the alloy showed that it consisted of aluminum oxyhydroxide with incorporation of silicon in its elemental and two oxidized states +3 and +4 Mott–Schottky analysis showed that trivalent silicon ion acted as an ntype dopant in the film The interrelationship between passive film composition electronic properties and pitting behavior has been discussedThe authors are grateful to Conacyt National Council of Science and Technology México for the financial support under grant no 51303Y E CoralEscobar is thankful to Universidad del Atlántico Colombia for granting the leave of absence to do doctoral research at CinvestavMérida The authors also thank Dr P BartoloPérez for the useful discussions on surface analytical investigations and to Ms Dora Huerta and W Cauich for the technical assistance during the analysis by SEM and XPS respectively

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