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Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution
Author(s) -
Colombo Marco,
Buzolin Ricardo H.,
Gariboldi Elisabetta,
Vallant Rudolf,
Sommitsch Christof
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810383
Subject(s) - intermetallic , corrosion , materials science , eutectic system , dielectric spectroscopy , alloy , gravimetric analysis , metallurgy , aqueous solution , electrochemistry , volume fraction , polarization (electrochemistry) , chemical engineering , composite material , chemistry , electrode , organic chemistry , engineering
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 microstructural 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.