1. DED-LB manufactured Ti–6Al–4V–4Cu alloy : materials development, characterization, and in vivo biocompatibilityAndrej Jeromen, Anish Nair, Peter Rodič, Denis Sačer, Barbara Kapun, Maša Čater, Ana Brunčić, Katarina Kozlica, Radmila Milačič Ščančar, Andrej Cör, Edvard Govekar, Ingrid Milošev, Simon Horvat, 2025, original scientific article Keywords: Ti–6Al–4V–4Cu alloy, additive manufacturing, laser-based directed energy deposition (DED-LB), microstructure and phase analyses, corrosion, in vivo biocompatibility
Published in DiRROS: 10.11.2025; Views: 51; Downloads: 13
 Full text (18,03 MB)
This document has many files! More... |
2. The importance of chemical transformations of adsorbed molecules for corrosion inhibition : mercaptobenzimidazoles on copperAnton Kokalj, Erik Gregori, Barbara Kapun, Ingrid Milošev, 2025, original scientific article Abstract: This study investigates whether mercaptobenzimidazoles act as thiolates in inhibiting copper corrosion. To this end, we examined three mercaptobenzimidazole derivatives — 2-mercaptobenzimidazole (SH-BimH), 2-mercapto-1-methylbenzimidazole (SH-BimMe), and 2-(methylthio)benzimidazole (Me-S-BimH) — as corrosion inhibitors for copper in 3 wt% NaCl solution using a combined experimental and computational approach. Me-S-BimH has a thiol group (single bondSH) replaced by a methylthio group (single bondSCH ), which should prevent the formation of surface thiolates. In contrast, SH-BimMe has the same molecular formula as Me-S-BimH, but its methyl group does not cap the thiol group. Corrosion experiments reveal that after 1 h of immersion, Me-S-BimH is considerably less effective than SH-BimH and SH-BimMe at inhibiting copper corrosion. However, after 100 h of immersion, Me-S-BimH performs comparably to SH-BimH and SH-BimMe. This delayed effectiveness suggests that a molecular transformation activates Me-S-BimH over time. To explore this phenomenon, we performed a detailed DFT study of potential chemical transformations of adsorbed Me-S-BimH. Most transformations are exothermic, but only molecular deprotonation and Csingle bondS bond cleavage between the azole ring and the methylthio group exhibit sufficiently low activation barriers to occur at room temperature. Similar deprotonation and Csingle bondS bond cleavage reactions occur also for SH-BimH and SH-BimMe, leading to more strongly bound species than their intact molecular forms. Due to these transformations, Me-S-BimH and SH-BimH eventually result in the same strongly bound species, while SH-BimMe forms an analogous species. These findings may explain why, over time, all three compounds exhibit similar corrosion inhibition characteristics, and highlight the importance of chemical transformations of adsorbed molecules in corrosion inhibition.
Keywords: copper, corrosion inhibition, electrochemical measurements
Published in DiRROS: 25.08.2025; Views: 273; Downloads: 145
Full text (4,41 MB)
This document has many files! More... |
3. Zr and Zr-Cr commercial conversion coatings deposited on 3003 aluminium alloy foilMaja Mujdrica Kim, Barbara Kapun, Ingrid Milošev, 2025, original scientific article Abstract: MAVOMcoat MC1300 (Zr-Cr-based coating) and MC1700 (Zr-based coating) on chemically pre-treated aluminium alloy 3003. Conversion times varied from 80 s to 45 min. After deposition, the samples were subjected to three post-treatments: air drying for 15 min, air drying for 24 h, and immersion in 3.5 wt% NaCl solution for 24 h. Corrosion resistance was evaluated using electrochemical measurements, whereas scanning electron microscopy with energy dispersive spectroscopy and X-ray photoelec tron spectroscopy were employed for surface analysis. Based on the evaluation of corrosion parameters, the optimal conversion times for MC1700 and MC1300 were determined to be 10 min and 7 min, respectively. The conversion coatings MC1700 and MC1300 were characterised by distinct elemental compositions, with the former predominantly comprising Zr, O, Al and F, and the latter Zr, O, Al, Cr and F. Notably, the thickness of coatings was between 10 and 170 nm, depending on the type of coating and location (matrix or intermetallic particles). The 24-hour immersion of MC1700 ZrCC in 3.5 wt% NaCl led to progressive build-up of Zr oxide and release of fluoride from the coating.
Published in DiRROS: 10.06.2025; Views: 481; Downloads: 169
Full text (4,77 MB) |
4. Composition, microstructure and corrosion resistance of DED-LB additively manufactured Ti–6Al–4V alloy : comparison with wrought alloyIngrid Milošev, Peter Rodič, Barbara Kapun, Denis Sačer, Anish Nair, Davorin Kramar, Andrej Jeromen, Edvard Govekar, 2025, original scientific article Keywords: titanium alloys, directed-energy deposition by laser beam, simulated physiological solution
Published in DiRROS: 03.06.2025; Views: 509; Downloads: 300
Full text (30,07 MB)
This document has many files! More... |
5. |
6. |
7. |
8. |
9. |
10. |
