Abstract
Influence of roughness (ra) from 43 to 474nm on corrosion and fretting corrosion of commercially pure titanium (CpTi) was studied in the Ringer’s solution. The anodic polarization and electrochemical impedance spectroscopy (EIS) revealed the highest corrosion resistance of CpTi with ra 43nm and correlated well with the surface energy (SE). The highest potential drop associated with the fretting corrosion is observed for CpTi with ra 43nm followed by 474nm; this is found to correspond with the worn out area. The fretting current density (ifretting) is several order higher than obtained during the potentiodynamic polarization (without fretting) study. Fretting corrosion manifested by the drop in electrochemical potential is simulated with high accuracy using fretting current density and an initial contact area. Fretting corrosion at an applied potential (+250mV(SCE)) is produced much larger fretting corrosion current density than during the open circuit potential (OCP).
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