Electrochemical corrosion behaviour of dental/implant alloys in saline medium.
Dental alloys implanted in mouth are exposed to various aggressive conditions. Keeping this in view, corrosion behaviour of various dental alloys viz. Ni-Cr, Co-Cr, Cu-Ni-Al and commercially pure Ti (c.p. Ti) were studied in 3% NaCl medium by using Tafel polarization, cyclic polarization and electrochemical impedance spectroscopy techniques. EIS studies were carried out for different duration viz. 1 h, 1 day and 7 days to evaluate the stability of passive film and change in corrosion characteristics with time. It has been found that for Ni-Cr, Co-Cr (DRDO developed) and c.p. Ti the passive film characteristic changed with time whereas for Co-Cr (commercial) and Cu-Ni-Al alloys, the passive film characteristics remained same. From DC electrochemical studies various parameters viz. i(corr), E(corr), i(pass), E(pass) were evaluated. The corrosion rates were observed to be in the order Cu-Ni-Al > Co-Cr (commercial) > Ni-Cr > c.p. Ti > Co-Cr (DRDO).
Sharma
Mohit
M
Defence Materials and Stores Research and Development Establishment, Kanpur, India. kumarmohitsharma@rediffmail.com
Kumar
A V Ramesh
AV
Singh
Nirbhay
N
D000497:Alloys / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry*; D003343:Corrosion; D015921:Dental Implants; D004563:Electrochemistry / Q000379:methods*; D019544:Equipment Failure Analysis; D008422:Materials Testing; D012965:Sodium Chloride / Q000737:chemistry*
D000497:Alloys; D015921:Dental Implants; D012965:Sodium Chloride