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.
- aluminium alloy, electrochemical impednace spectroscopy (EIS), erbium and zirconium additions, localized corrosion, potentiodynamic polarization
ASJC Scopus subject areas
- Materials Science(all)
Fields of Expertise
- Advanced Materials Science