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41.
An electrochemical and spectroscopic study of surfaces on bronze sculptures exposed to urban environment
Dajana Mikić, Helena Otmačić Ćurković, Tadeja Kosec, Neven Peko, 2021, izvirni znanstveni članek

Povzetek: Polluted urban environment enhances dissolution of patina and underlying bronze material of recent and historical bronze sculptures exposed outdoors. In this work, two bronze statues, situated in one of the most polluted Croatian cities, were examined in order to characterize composition of patina and its electrochemical stability. The composition of patina on several positions on each sculpture was determined by EDS, Raman spectroscopy, and FTIR measurements. Electrochemical impedance spectroscopy measurements were conducted in order to evaluate the corrosion stability of both patina and underlying bronze. Results obtained in this work show that the two examined bronze sculptures were covered with patina layer that was mainly composed of copper sulfides and sulphates, which is in accordance with the high concentrations of H2S and SO2 in the atmosphere. However, the variations in the appearance of FTIR and Raman spectra revealed that the amount of each species differed from spot to spot, as well as the fact that other compounds, such as carbonates, were present at some areas. This difference in patina composition was reflected in electrochemical behavior as observed by electrochemical impedance spectroscopy.
Ključne besede: bronze, corrosion, spectroscopy, FTIR, Raman, EIS, open access
Objavljeno v DiRROS: 16.05.2023; Ogledov: 295; Prenosov: 173
.pdf Celotno besedilo (4,82 MB)
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42.
Comparison of the corrosion properties of CoCrMo dental alloys in artificial saliva
Tadeja Kosec, Mirjam Bajt Leban, Matej Kurnik, Igor Kopač, 2021, izvirni znanstveni članek

Povzetek: CoCrMo alloys are known for their biocompatible properties, which, together with their favorable mechanical properties, mean they can be efficiently used in dentistry. With the development of selective laser melting for the fabrication of 3D-printed ob - jects, interest in the corrosion properties of this alloy has risen in the field of prosthodontics. In the study, CoCrMoW dental al - loys were studied in artificial saliva at body temperature, i.e., 37 °C. Different forms of CoCrMoW alloy were selected: a refer - ence sample, i.e., original material as received from the supplier, a cast sample acquired from an ordinary procedure in a dental laboratory, and two 3D-printed samples made from CoCrMoW powder using the selective laser melting (SLM) method. Electro - chemical, spectroscopic and hardness measurements were conducted. It was shown that the reference and cast samples have similar microstructural and electrochemical properties, while the electrochemical properties of the 3D-printed samples differ, most probably due to the effect of the higher micro porosity and chemical composition of the alloys.
Ključne besede: CoCrMo dentalne zlitine, umetna slina, aditivne tehnologije, precizijsko ulivanje, korozija
Objavljeno v DiRROS: 02.12.2022; Ogledov: 258; Prenosov: 106
.pdf Celotno besedilo (551,43 KB)
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