Characterization of localized corrosion of heat treated Er- and Zr-containing A356 alloys in 3.5 wt% NaCl aqueous solution

Marco Colombo, Ricardo Henrique Buzolin, Elisabetta Gariboldi, Rudolf Vallant, Christoph Sommitsch

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

The influences of Er and Zr additions on the corrosion behavior of A356 (Al-7Si-0.4Mg) alloy are investigated. Electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy), gravimetric analyses, and micro-structural investigations demonstrate that 0,3 wt% Er nominal addition is beneficial for the corrosion resistance of A356 alloy, due to a modified eutectic morphology and a low volume fraction of intermetallic compounds. The further addition of about 0.5 wt% Zr, on the other hand, partially reduces the corrosion resistance of Er-containing A356 alloy, possibly due to a higher amount of intermetallic compounds which promote corrosion localization.
Originalspracheenglisch
Seiten (von - bis)1-13
FachzeitschriftMaterials and corrosion
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 7 Jun 2018

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Corrosion
Intermetallics
Corrosion resistance
Potentiodynamic polarization
Electrochemical impedance spectroscopy
Eutectics
Volume fraction
Hot Temperature

Schlagwörter

  • aluminium alloy, electrochemical impedance spectroscopy (EIS), erbium and zirconium additions, localized corrosion, potentiodynamic polarization

ASJC Scopus subject areas

  • !!Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Dies zitieren

Characterization of localized corrosion of heat treated Er- and Zr-containing A356 alloys in 3.5 wt% NaCl aqueous solution. / Colombo, Marco; Buzolin, Ricardo Henrique; Gariboldi, Elisabetta; Vallant, Rudolf; Sommitsch, Christoph.

in: Materials and corrosion, 07.06.2018, S. 1-13.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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abstract = "The influences of Er and Zr additions on the corrosion behavior of A356 (Al-7Si-0.4Mg) alloy are investigated. Electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy), gravimetric analyses, and micro-structural investigations demonstrate that 0,3 wt{\%} Er nominal addition is beneficial for the corrosion resistance of A356 alloy, due to a modified eutectic morphology and a low volume fraction of intermetallic compounds. The further addition of about 0.5 wt{\%} Zr, on the other hand, partially reduces the corrosion resistance of Er-containing A356 alloy, possibly due to a higher amount of intermetallic compounds which promote corrosion localization.",
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T1 - Characterization of localized corrosion of heat treated Er- and Zr-containing A356 alloys in 3.5 wt% NaCl aqueous solution

AU - Colombo, Marco

AU - Buzolin, Ricardo Henrique

AU - Gariboldi, Elisabetta

AU - Vallant, Rudolf

AU - Sommitsch, Christoph

PY - 2018/6/7

Y1 - 2018/6/7

N2 - The influences of Er and Zr additions on the corrosion behavior of A356 (Al-7Si-0.4Mg) alloy are investigated. Electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy), gravimetric analyses, and micro-structural investigations demonstrate that 0,3 wt% Er nominal addition is beneficial for the corrosion resistance of A356 alloy, due to a modified eutectic morphology and a low volume fraction of intermetallic compounds. The further addition of about 0.5 wt% Zr, on the other hand, partially reduces the corrosion resistance of Er-containing A356 alloy, possibly due to a higher amount of intermetallic compounds which promote corrosion localization.

AB - The influences of Er and Zr additions on the corrosion behavior of A356 (Al-7Si-0.4Mg) alloy are investigated. Electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy), gravimetric analyses, and micro-structural investigations demonstrate that 0,3 wt% Er nominal addition is beneficial for the corrosion resistance of A356 alloy, due to a modified eutectic morphology and a low volume fraction of intermetallic compounds. The further addition of about 0.5 wt% Zr, on the other hand, partially reduces the corrosion resistance of Er-containing A356 alloy, possibly due to a higher amount of intermetallic compounds which promote corrosion localization.

KW - aluminium alloy, electrochemical impedance spectroscopy (EIS), erbium and zirconium additions, localized corrosion, potentiodynamic polarization

KW - aluminium alloy, electrochemical impednace spectroscopy (EIS), erbium and zirconium additions, localized corrosion, potentiodynamic polarization

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JO - Materials and corrosion

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