20.500.12556/DKUM-90118-53f2ce70-d9f4-01c1-e203-124828f8ffbd Korozijske lastnosti cirkonija v agresivnem mediju in umetni slini s simulacijo vnetnih procesov diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje Corrosion properties of zirconium in aggressive media and artificial saliva by simulation of inflammatory processes Proučevali smo korozijsko hitrost in primerjali odpornosti cirkonija korodiranega v agresivnem mediju in umetni slini s simulacijo vnetnih procesov. Vzorce smo potopili v čisto umetno slino in v raztopine vodikovega peroksida različnih koncentracij. Pripravljenim raztopinam vodikovega peroksida smo dodajali mlečno kislino, da bi dosegli pH vrednost 4,5, ki je enak pH vrednosti plaka v ustni votlini. S tem smo želeli dobiti čim bolj podobno okolje, ki so jim vsakodnevno izpostavljeni naši zobje in ustna votlina. Vzorce smo potopili v pripravljene raztopine pri 37°C in jih pasivirali 24, 48, 72 in 96 ur. Rezultate smo dobili na osnovi gravimetrične metode in vzorcem izračunali korozijsko hitrost. Izgube mase vzorca cirkonija v umetni slini v raztopinah z različnimi koncentracijami vodikovega peroksida so zelo majhne. Posledično so tudi korozijske hitrosti nizke. Korozijska hitrost po 24 urah pasiviranja je bila relativno visoka. Znižanje korozijske hitrosti smo opazili že po 48 urah pasiviranja. Pri raztopinah H2O2 s 5% in 10% koncentracijo in pH=4,5, predpostavljamo, da se je po 72 urah izpostavljenosti zaščitna plast malenkost porušila, saj se je korozijska hitrost nekoliko zvišala, dokler ni nastopila - t.i. repasivacija, kar prikazuje ponovno znižanje korozijske hitrosti po 96 urah pasiviranja. Izračunane korozijske hitrosti so še vedno relativno majhne in zato je cirkonij z vidika korozije primeren za izdelavo dentalnih implantatov. The aim of the diploma thesis is to determine the corrosion rate and compare the resistance of corroded zirconium in an aggressive media and artificial saliva by simulating inflammatory processes. The samples were studied in pure artificial saliva and in solutions of different concentrations of hydrogen peroxide. By adding lactic acid to hydrogen peroxide solutions, we reached a pH value of 4.5, which is the pH value of the oral cavity, in order to obtain as similar as possible the conditions to which our teeth and oral cavity are exposed on a daily basis. The samples were immersed in different solutions at 37°C for 24, 48, 72 and 96 hours, where they were passivated. The measurements were carried out using the gravimetric method. Based on the results we obtained, we calculated the corrosion rate. The results showed that the mass loss of the zirconium sample in artificial saliva and different hydrogen peroxide solutions is generally very small. As a result, corrosion rates were very low. The corrosion rate was initially high after 24 hours, but after the formation of a protective oxide layer after 48 hours, the corrosion rate decreased. For H2O2 solutions with 5% and 10% concentration and pH=4.5, it is assumed that after 72 hours of exposure, the protective layer has been slightly degraded, as the corrosion rate has slightly increased. After that the so-called repassivation occured, which is expressed as a decrease in the corrosion rate again after 96 hours of passivation. The calculated corrosion rates are still relatively low, so we have confirmed that zirconium is suitable for use in dental implantology. korozija cirkonij umetna slina vodikov peroksid pasivni film corrosion zirconium artificial saliva hydrogen peroxide passive film true true false [N. Klačinski] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-08-22 19:38:37 2024-09-05 10:51:18 2024-11-22 03:10:21 0000-00-00 00:00:00 2024 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (VIII, 32 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.193.4:669.296(043.2) 215930883 VS_Klacinski_Nensy_2024.pdf VS_Klacinski_Nensy_2024.pdf 1 4C13246A9BA75CBB6A6F1D570501058A f16b42998b01846367d9bba1c11be6128fe3d0545415399fcfbcca55321a95c3 fb2fe6a3-6b54-11ef-b541-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=184441 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0