Acar, Muhammet Taha

Since AISI 316L stainless steel has excellent mechanical qualities and resistance to corrosion, it is widely used in many different industries. Surface treatments like etching and sandblasting are frequently used to improve the surface properties for certain uses. It is still difficult to comprehend how these treatments affect the material’s resistance to corrosion and wear, though. In this work, we methodically examine how sandblasting and etching affect AISI 316L stainless steel’s resistance to corrosion and wear. We assess the morphological, chemical, and performance changes brought about by these treatments using X-ray diffraction, scanning electron microscopy, microhardness testing, and tribological analysis. Our findings show that the surface morphology and chemistry are dramatically changed by both treatments, which has an impact on the corrosion and wear behavior of the material. The best wear resistance was obtained from the sandblasted sample (0.64 x10−3 mm3/Nm) and the best corrosion resistance was obtained from the untreated sample. The optimization of surface treatment techniques for stainless steel alloys in many industrial applications is facilitated by these findings.

Acar, Muhammet Taha

This study investigates the structural, corrosion, and tribocorrosion properties of Ti45Nb alloy coated with monolayer and bilayer films. Ti45Nb samples were ultrasonically degreased, anodized in a H2SO4 and H3PO4 solution, and coated with graphene oxide (GO) films via spin coating and subsequent annealing. The anodized samples exhibited anatase and rutile phases, while GO films displayed characteristic Raman shifts indicating graphite oxidation. Corrosion tests in simulated body fluid (SBF) revealed enhanced corrosion resistance in bilayer samples, evidenced by a lower corrosion current density (2.28×10-6 A/cm2) and a higher corrosion potential (10 mV) compared to monolayer and untreated samples. Electrochemical impedance spectroscopy (EIS) indicated superior charge transfer resistance (9.72 Ωcm2) for bilayer coatings. Tribocorrosion tests demonstrated reduced wear rates and coefficient of friction (COF) in bilayer films, attributed to increased surface hardness and load-carrying capacity. The findings suggest that the bilayer coating significantly enhances the corrosion and tribocorrosion resistance of Ti45Nb, making it a promising material for biomedical applications.

Acar, Muhammet Taha

In this study, manganese (Mn) and strontium (Sr) were doped into TiO2 nanotubes (TNT), which are frequently used in energy storage equipment. The aim of this study is to compare the corrosion tribocorrosion and cyclic voltammetry performances of doped TNTs after examining their structural characteristics. XRD and SEM were used to characterize the nanotubes. After the anodization processes, the inclusion of Mn and Sr in the TNT structure was confirmed by XRD analysis. In SEM analysis, it was observed that with the addition of Mn and Sr into the solution, longer nanotubes were formed with increased electrical conductivity. Increasing the nanotube length and shrinking the nanotube's inner diameter provided increased corrosion resistance. Increased surface hardness resulted in increased tribocorrosion resistance. In cyclic voltammetry experiments, the capacitance increased approximately 5 times in Sr-doped TNT compared to undoped TNT, while it increased 10 times in Mn-doped TNT.