Corrosion Resistance of a Plasma-Oxidized Ti6Al4V Alloy for Dental Applications

Abstract

A Ti6Al4V alloy was plasma-oxidized at 600 °C during 1, 2, 3, 5 and 8 h and corroded in an artificial saliva solution. Electrochemical evaluation was performed by using potentiodynamic polarization curves, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements during 100 h. Corroded specimens were characterized by using Raman spectroscopy and scanning electronic microscopy (SEM). All tests indicated that the highest corrosion resistance was obtained for specimen oxidized during 3 h since the noblest free corrosion potential, lowest passive and corrosion current density values, as well as the highest polarization resistance values were obtained under these circumstances. EIS measurements indicated that the highest impedance and phase angle values obtained for this specimen exhibited a high capacitive behavior typical of a very compact passive film.

Using Applied Electrochemistry to Obtain Nanoporous TiO2 Films on Ti6Al4V Implant Alloys and Their Preclinical In Vitro Characterization in Biological Solutions

“…The increase in the polarization resistance values in the case of the nanoporous TiO 2 film electrochemically formed on titanium alloy was due to the presence of the TiO 2 layer that provided superior insulating properties through its electrochemically controlled formation. This behavior has also been observed in the specialized literature by other authors with other biomaterials [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For the electrochemically oxidized grade 5 Ti6Al4V alloy, an increase in the polarization resistance values was observed with increasing immersion time; for the untreated grade 5 Ti6Al4V alloy, it was observed that the polarization resistance values showed a slight decrease after 38 h of immersion in comparison to the value obtained after 360 min, and a slight increase at the end of the immersion period.…”

“…This behavior can be explained by the formation of a more stable and protective thin oxide film on the surface of the electrochemically oxidized alloy, which acts as a protective film to prevent the release of metal ions into the biological environment. The trend toward higher values in the case of different types of materials obtained by electrochemical oxidation compared to different untreated alloys has also been observed by other authors in the specialized literature [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The comparative evolution of the polarization resistance for the untreated grade 5 titanium alloy and for the electrochemically oxidized titanium alloy with the nanoporous film of titanium oxide (TiO 2 ) is presented in Figure 8a-c at three time periods in the total sample immersion period in Hank's biological solution.…”

“…Furthermore, the anodic oxidation process can increase the thickness of the native oxide layer on the surfaces of the titanium materials to develop corrosion resistance and decrease the release of metal ions with toxic properties [20][21][22][23][24][25][26][27][28][29][30]. Various studies are reported in the specialized literature that deal with the subject of modifying the surfaces of titanium alloys by various methods to increase corrosion resistance in different environments that simulate the fluids of the human body [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. In-depth research to study the effect of time on the degradation by the electrochemical corrosion of untreated grade 5 Ti6Al4V alloy compared to electrochemically oxidized grade 5 Ti6Al4V alloy has not been reported in specialized literature.…”

Synthesis, Characterization and Investigation of Anticorrosion Properties of an Innovative Metal–Organic Framework, ZnMOF-BTA, on Carbon Steel in HCl Solution

“…The results showed that adding ZnMOF-BTA to 1M hydrochloric acid solution inhibits corrosion processes and protects carbon steel from degradation. The results also revealed that the inhibition efficiency of ZnMOF-BTA is greater than the inhibition efficiencies of some MOFs reported in the literature [46].…”

A novel microfluidic compact disc to investigate electrochemical property changes between artificial and real salivary samples mixed with mouthwashes using electrical impedance analysis

“…EIS is a method with a wide range of uses, including the detection of biomarkers and cellular deformities in physiological fluids, detection of food-borne pathogens and cancer cells, as well as the investigation of metal corrosion and coated metal surfaces [ 17 ]. In the dentistry field, EIS spectroscopy is primarily used for the examination of dental materials, corrosion and mycosis identification [ 18 – 21 ]. EIS analysis of saliva is limitedly studied despite promising potential as a diagnostic tool for oral and systemic diseases.…”