Abstract
The corrosion behavior of lead free Sn–3.5Ag and Sn–3.5Ag alloy reinforced with different amounts of CeO2 nanoparticles is investigated in 3.5wt.% NaCl solution. Polarization and electrochemical impedance studies reveal that the corrosion current density (icorr), the corrosion potential (Ecorr), and double layer capacitance (Cdl) decrease, while the charge transfer (Rct)/polarization resistance (Rp) increase with the incorporation of CeO2 nanoparticles (up to an optimum of ~12wt.% of CeO2 nanoparticles). The corrosion product, SnCl2 is detected on the surface of Sn–Ag alloy which is coarse and loosely adherent to the surface, while Sn–Ag/CeO2 possess finer corrosion products intact to the surface and thus increases passivity.
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