Corrosion Behavior of AlMgSi Alloy in Aqueous Saline Solution

The corrosion behavior of AlMgSi alloy in a solution of 3.5 % NaCl in H2O as a function of time of immersion has been studied and assessed by means of electrochemical techniques. These included potentiodynamic polarization curves, linear polarization resistance (LPR), electrochemical impedance spect...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 10; no. 2; pp. 1792 - 1808
Main Authors Rodríguez-Diaz, R.A., Uruchurtu-chavarín, J., Cotero-Villegas, A.M., Valdez, S., Juárez-Islas, J.A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.02.2015
Subjects
Al-based alloy
AlMgSi alloy
Corrosion
Electrochemical Technique
Mg2Si precipitate
NaCl solution
NaCl solution
Mg2Si precipitate
Electrochemical Technique
Corrosion
AlMgSi alloy
Al-based alloy
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Summary:The corrosion behavior of AlMgSi alloy in a solution of 3.5 % NaCl in H2O as a function of time of immersion has been studied and assessed by means of electrochemical techniques. These included potentiodynamic polarization curves, linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) measurements and electrochemical noise measurements (EN). The corrosion rate expressed in terms of corrosion current density of AlMgSi alloy resulted higher than that of pure Aluminum. The precipitation of Mg2Si phase and the formation of the galvanic couple Al-Mg induced a shift of the current density towards higher values. According to electrochemical noise measurements, the Al-based alloy experienced a localized type of corrosion at virtually all the time of exposure. The hydroxide or oxide films formed over the surface of AlMgSi alloy were not totally protective. The electrochemical behavior of corrosion has been explained in terms of the stability of the corrosion
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)05112-X