title: Effects of Peracetic Acid on the Corrosion Resistance of Commercially Pure Titanium (grade 4).
abstract: The aim of this study was to evaluate the corrosion resistance of pure titanium grade 4 (cp-Ti-4), subjected to disinfection with 0.2% and 2% peracetic acid during different immersion periods using anodic potentiodynamic polarization test in acid and neutral artificial saliva. Cylindrical samples of cp-Ti-4 (5 mm x 5 mm) were used to fabricate 24 working electrodes, which were mechanically polished and divided into eight groups (n=3) for disinfection in 2% and 0.2% peracetic acid for 30 and 120 min. After disinfection, anodic polarization was performed in artificial saliva with pH 4.8 and 6.8 to assess the electrochemical behavior of the electrodes. A conventional electrochemical cell, constituting a reference electrode, a platinum counter electrode, and the working electrode (cp-Ti specimens) were used with a scanning rate of 1 mV/s. Three curves were obtained for each working electrode, and corrosion was characterized by using scanning electron microscopy (SEM) and energy dispersive x-ray spectrometry (EDS). Data of corrosion potential (Ecorr) and passive current (Ipass) obtained by the polarization curves were analyzed statistically by Student's t-test (a=0.05). The statistical analysis showed no significant differences (p>0.05) between artificial saliva types at different concentrations and periods of disinfection, as well as between control and experimental groups. No surface changes were observed in all groups evaluated. In conclusion, disinfection with 0.2% and 2% peracetic acid concentrations did not cause corrosion in samples manufactured with cp-Ti-4.
authors.affiliation: UNMES - Universidade Metropolitana de Santos, Santos, SP, Brazil.
authors.forename: Lariça B
authors.initials: LB
authors.lastname: Raimundo
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, USP - Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Iara A
authors.initials: IA
authors.lastname: Orsi
authors.affiliation: Department of Materials Engineering, UFSCar - Universidade Federal de São Carlos, São Carlos, SP, Brazil.
authors.forename: Sebastião E
authors.initials: SE
authors.lastname: Kuri
authors.affiliation: Department of Materials Engineering, UFSCar - Universidade Federal de São Carlos, São Carlos, SP, Brazil.
authors.forename: Carlos Alberto D
authors.initials: CA
authors.lastname: Rovere
authors.affiliation: Department of Materials Engineering, UFSCar - Universidade Federal de São Carlos, São Carlos, SP, Brazil.
authors.forename: Thaís P
authors.initials: TP
authors.lastname: Busquim
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, USP - Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Borie
mesh_terms: D003343:Corrosion; D008855:Microscopy, Electron, Scanning; D010463:Peracetic Acid / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D014025:Titanium / Q000737:chemistry*
chemical_list: D014025:Titanium; D010463:Peracetic Acid