Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Ataturk University, Mühendislik Fakültesi, Makine Mühendisliği, Turkey
Approval Date: 2022
Thesis Language: Turkish
Student: Kubilay Şenel
Supervisor: Halim Kovacı
Abstract:
Purpose: In this study; by applying the anodic oxidation (anodization) process with the same parameters to Cp-Ti, Ti6Al4V and Ti45Nb titanium alloys, it is aimed to improve the tribological properties of these materials by increasing the surface hardness and to increase their electrochemical corrosion resistance thanks to the TiO2 anodic film obtained. Method: Cp-Ti, Ti6Al4V and Ti45Nb alloys in bar form were cut in 20×20×4 mm dimensions. After the surfaces of the cut samples were polished with SiC abrasive sandpapers, the surfaces were polished with Al2O3 powders. Afterwards, the surfaces of all samples were cleaned by washing with ethyl alcohol. The prepared samples were subjected to anodization process. After the anodization process, XRD, Raman, surface and cross-section SEM, hardness, surface roughness, contact angle analyzes were performed on both untreated and anodized samples. Finally, wear and corrosion tests of the samples were carried out. Findings: As a result of the studies, it was observed that an oxide layer containing anatase phase was formed on the surface of the material after the anodization process, and the anatase phase density and oxide thickness increased with increasing potential. Due to the different electrical resistances of Cp-Ti, Ti6Al4V and Ti45Nb titanium alloys, the TiO2 anodic film thicknesses formed on the surface differed, and it was observed that the morphological structures on the surfaces changed after the anodization process. It was observed that different shapes of porous structures were formed in the samples and the surface roughness values changed due to the difference in electrical resistance. While the thickest film was obtained from Ti45Nb samples, the thinnest films were obtained from Cp-Ti samples. The thickness of the obtained anodic films, the surface hardness and the density of the anatase phase as determined from the results of XRD and Raman analysis played a decisive role in the tribological and electrochemical performances. The lowest wear rate was obtained from the Ti45Nb sample with the highest surface hardness. The highest corrosion resistance was obtained by obtaining the thickest anodic film from the Ti45Nb sample. Results: The tribological and electrochemical properties of the materials increased as the surface hardness/thickness of the anodic films increased and the anatase phase density increased with the increase in the voltage applied to the Cp-Ti, Ti6Al4V and Ti45Nb samples in the anodization process.