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2. Comparative evaluation of corrosion resistance of AISI 316L and Ti6Al4V dental materials under simulated inflammatory conditionsMojca Slemnik, 2025, original scientific article Abstract: Titanium and its alloys, as well as stainless steel, are commonly used materials for implants in the human body due to their excellent biocompatibility, corrosion resistance, and mechanical properties. However, the long-term performance of these materials in the oral cavity can be affected by the complex oral environment, including the ingestion of food, beverages, and oral hygiene products, leading to the presence of various ions, pH fluctuations, and inflammatory processes. In this study, the corrosion properties of two biocompatible materials, Ti6Al4V and AISI 316L stainless steel, are investigated under varying oral inflammatory conditions. Using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), SEM, and EDS analysis, the corrosion behaviour of both materials was analysed in environments simulating mild and severe inflammation. Results indicate that Ti6Al4V exhibits superior corrosion resistance at low H2O2 concentrations mimicking mild inflammation, with significantly lower corrosion rates compared to AISI 316L. However, at higher H2O2 concentrations, which correspond to severe inflammation, AISI 316L shows better resistance despite its susceptibility to pitting corrosion. Both alloys show reduced passivation after 72 h, with corrosion products accumulating on the surface after 96 h, contributing to repassivation. These results emphasise the need for individualized material selection in dental applications based on a patient’s susceptibility to oral inflammation.
Keywords: corrosion, EIS, inflammatory conditions, titanium, stainless steel, dental materials
Published in DKUM: 19.05.2025; Views: 0; Downloads: 1
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3. A nonlinear probabilistic pitting corrosion model of Ni–Ti alloy immersed in shallow seawaterŠpiro Ivošević, Gyöngyi Vastag, Nataša Kovač, Peter Majerič, Rebeka Rudolf, 2022, original scientific article Abstract: The degradation of metal materials in a marine environment represents the consequence
of the electrochemical corrosion of metals under the influence of the environment. The application
of new materials in the maritime industry requires experimental, real-world research on the form
of corrosive damage and the intensity of the corrosion. This paper analyses the pitting corrosion of
a rod-shaped nickel–titanium (Ni–Ti) alloy that was produced by means of the continuous casting
method. In total, three samples were posted in a real seawater environment and analysed after 6,
12, and 18 months. Pits were detected on the Ni–Ti alloy after 18 months of exposure to the marine
environment. The database on pitting corrosion was created by measuring depth in mm, which was
performed by means of a nonlinear method, and by the generation of an artificial database of a total
of 120, gauged in critical pit areas. The data were obtained by the application of a nonlinear model,
and under the assumption that corrosion starts after 12 months of exposure in the corrosive marine
environment. The EDX analysis of the Ni–Ti alloy composition inside the pits and on the edges of the
pits indicated that the corrosion process in the hole of the pit occurs due to the degradation of the Ni.
Keywords: Ni–Ti alloy, pitting corrosion, seawater, EDX analysis, nonlinear, probabilistic
Published in DKUM: 24.03.2025; Views: 0; Downloads: 11
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4. Development of a new AuCuZnGe alloy and determination of its corrosion propertiesRebeka Rudolf, Peter Majerič, Vojkan Lazić, Branimir Grgur, 2022, original scientific article Abstract: In this paper, we present the idea and development of a new gold-copper-zinc-germanium
(AuCuZnGe) alloy, which is related to the method of production and research of its key properties, so
that the new Au alloy could be used for jewelry production and in dental technology. The research
design was associated with the determination of appropriate chemical composition, manufacturing
technology, and performing the characterization. Melting and casting technologies were used to cast
the AuCuZnGe alloy while rolling was used to prepare the cylinders and cutting to make square
plates with a = 10 mm and thickness of 1 mm. Such plates were provided for corrosion testing.
Observation of the plate0
s microstructure was performed with Scanning Electron Microscopy (SEM)
equipped by Energy-Dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD). Corrosion
testing involved performing the following measurements: Polarization, the open circuit potentials,
and linear polarization resistance. Based on the SEM, EDS, XRD, and results of corrosion testing it can
be concluded that the new AuCuZnGe alloy possesses high corrosion stability and can be classified
as a high noble alloy.
Keywords: gold alloy, germanium, production, characterization, corrosion properties
Published in DKUM: 24.03.2025; Views: 0; Downloads: 9
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5. Corrosion of NiTiDiscs in different seawater environmentsJelena Pješčić-Šćepanović, Gyöngyi Vastag, Špiro Ivošević, Nataša Kovač, Rebeka Rudolf, 2022, original scientific article Abstract: This paper gives an approach to the corrosion resistance analysis and changes in the
chemical composition of anNiTi alloy in the shape of a disc, depending on different real seawater
environments. The NiTi discs were analysed after 6 months of exposure in real seawater environments:
the atmosphere, a tidal zone, and seawater. The corrosion tests showed that the highest corrosion rate
for the discs is in seawater because this had the highest value of current density, and the initial disc
had the most negative potential. Measuring the chemical composition of the discs using inductively
coupled plasma and X-ray fluorescence before the experiment and semiquantitative analysis after
the experiment showed the chemical composition after 6 months of exposure. Furthermore, the
applied principal component analysis and cluster analysis revealed the influence of the different
environments on the changes in the chemical composition of the discs. Cluster analysis detected small
differences between the similar corrosive influences of the analysed types of environments during the
period of exposure. The obtained results confirm that PCA can detect subtle quantitative differences
among the corrosive influences of the types of marine environments, although the examined corrosive
influences are quite similar. The applied chemometric methods (CA and PCA) are, therefore, sensitive
enough to register the existence of slight differences among corrosive environmental influences on
the analysed NiTi SMA.
Keywords: NiTi discs, corrosion rate, real seawater environment, cluster analysis (CA), principal component analysis (PCA)
Published in DKUM: 20.03.2025; Views: 0; Downloads: 11
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6. Corrosion characterization and ion release in SLM-manufactured and wrought Ti6Al4V alloy in an oral environmentMirjam Bajt Leban, Tadeja Kosec, Matjaž Finšgar, 2022, original scientific article Abstract: As-produced and heat-treated TiAlV samples were prepared by selective laser melting and compared to wrought samples of identical chemical composition. Microstructural, corrosion, and spectroscopic studies of additively manufactured samples in artificial saliva at 37 °C, with NaF and at pH 2.3 were as a novelty combined with metal ion release during 42 days immersion. In artificial saliva higher amount of ions was released on SLM specimen when compared to wrought alloy. The total amount of ions released from SLM specimen in AS containing NaF was 10-times higher than in AS, while in AS with lactic acid it was 100-times higher.
Keywords: Ti6Al4V, SLM, corrosion, ion release, XPS, ToF-SIMS
Published in DKUM: 05.12.2024; Views: 0; Downloads: 22
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7. Flower-like superhydrophobic surfaces fabricated on stainless steel as a barrier against corrosion in simulated acid rainRegina Fuchs-Godec, 2022, original scientific article Abstract: Functionalisation of the metal surface of low-carbon ferritic stainless steel (from hydrophilic to hydrophobic properties) was achieved by flower-like hierarchical structures on a steel substrate prepared by a low-cost immersion method. The flower-like structured hydrophobic layers on the steel substrate were obtained by immersing the samples in an ethanolic solution of stearic acid with the addition of various concentrations of expired vitamin E ((+)α-tocopherol). The stability and corrosion-inhibiting effect of the hierarchically structured (such as natural cornflower) hydrophobic layers were studied systematically during short and long immersion tests, 120 h (five days) in an acidic environment (pH = 3) using potentiodynamic measurements, electrochemical impedance spectroscopy and chronopotentiometry. The surfaces of the samples, their wettability, surface morphology and chemical composition were characterised by contact angle measurements, SEM, ATR-FTIR and EDAX. After 120 h of immersion, the inhibition efficiency of the flower-like structured hydrophobic layers on the steel substrate in the selected corrosion medium remained above 99%, and the hierarchical structure (flower-like structure) was also retained on the surface.
Keywords: acid rain, corrosion, flower-like structure, inhibition, stainless steel
Published in DKUM: 05.12.2024; Views: 0; Downloads: 9
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8. ǂThe ǂcorrosion resistance of dental Ti6Al4V with differing microstructures in oral environmentsMirjam Bajt Leban, Tadeja Kosec, Matjaž Finšgar, 2023, original scientific article Abstract: The impact of the microstructural properties of a Ti6Al4V alloy on its electrochemical properties, as well as the effect of the α- and β-phases present within it, is still unclear. With the introduction of new, emerging technologies, such as selective laser melting and post heat treatments, the effect of the microstructure on an alloy's corrosion properties has become increasingly interesting from a scientific perspective. When these alloys are produced through different methods, despite an identical chemical composition they have diverse microstructures, and consequently display varying resistance to corrosion. In the present research study, Ti–6Al–4V alloy specimens produced by three different processes, leading to the formation of three different microstructures were investigated: heat treated specimen fabricated by selective laser melting, wrought and cast specimens. The impact of the microstructure of these alloys when immersed in artificial saliva was studied through the use of various electrochemical techniques, by microscopical examinations, and time-of-flight secondary ion mass spectrometry. Corrosion properties were investigated by the measurement of open circuit potential, linear polarization, and potentiodynamic curve measurements followed by microscopical examinations, and time-of-flight secondary ion mass spectrometry examination was conducted to reveal spatial distribution of alloying species on oxide film. It was found that the difference between specimens containing an α+β microstructure was small and not dependent on the aspect ratio of the β-phase, alloy grain size, and vanadium partitioning coefficient, but rather on the size, shape, and content of this phase.
Keywords: Ti6Al4V, dental alloy, microstructure, corrosion resistance, heat treatment, ToF-SIMS
Published in DKUM: 07.05.2024; Views: 198; Downloads: 45
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9. In Vitro Bioelectrochemical Properties of Second-Generation Oxide Nanotubes on Ti–13Zr–13Nb Biomedical AlloyAgnieszka Stróż, Thomas Luxbacher, Karolina Dudek, Bartosz Chmiela, Patrycja Osak, Bożena Łosiewicz, 2023, original scientific article Keywords: anodizing, corrosion resistance, oxide nanotubes, Ti–13Zr–13Nb alloy, zeta potential
Published in DKUM: 04.04.2024; Views: 193; Downloads: 15
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10. High-Order Fiber Bragg Grating Corrosion Sensor Based on the Detection of a Local Surface ExpansionVedran Budinski, Matej Njegovec, Simon Pevec, Boris Macuh, Denis Đonlagić, 2023, original scientific article Abstract: This paper presents a fiber optic sensor for the detection of corrosion processes that occur on metal surfaces. In the proposed sensor design, a sensing fiber with an inscribed high-order Bragg grating is attached to the observed metal surface. A broadening of high-order Bragg grating spectral characteristics is observed and used to detect small and highly localized longitudinal strain variations that occur along the fiber as a result of corrosive rust flakes' formations beneath the sensing fiber. The proposed approach provides a straightforward fabrication method, the possibility for unobtrusive mounting, including mounting of the sensor beneath the corrosion-protective layers, and consistent corrosion detection yields.
Keywords: optical fiber sensors, corrosion, impact of corrosion, optic sensors
Published in DKUM: 09.02.2024; Views: 320; Downloads: 35
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