TY  - JOUR
AU  - Stevanovic, Sanja
AU  - Tripkovic, Dusan
AU  - Gavrilovic-Wohlmuther, Aleksandra
AU  - Rogan, Jelena
AU  - Lačnjevac, Uroš C.
AU  - Jovanovic, Vladislava
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4897
AB  - Pt, PtSn and PtSnO2 catalysts supported on high surface area carbon synthesized by microwave assisted polyol procedure were tested for methanol oxidation. Based on TGA, EDX and XRD analysis, PtSn/C is composed of Pt and Pt3Sn phase while the rest of Sn is present in a form of very small tin oxide particles. This paper focuses on structure-activity relationships for CO tolerance and methanol oxidation reactions after addition of Sn to Pt catalysts. Alloying of Sn with Pt improves the rate of CO oxidation despite the fact that the pure Sn does not react with CO and therefore activity for methanol oxidation increases similar to 2 times in comparison to Pt/C catalyst. PtSn/C catalyst shows small advantage in comparison with PtSnO2/C catalyst due to the alloyed Sn and its electronic effect. Long term stability tests also confirmed that PtSn/C catalyst is somewhat better in comparison to PtSnO2/C.
T2  - International Journal of Electrochemical Science
T1  - Carbon Supported PtSn versus PtSnO2 Catalysts in Methanol Oxidation
IS  - 2
VL  - 16
DO  - 10.20964/2021.02.55
ER  - 

@article{
author = "Stevanovic, Sanja and Tripkovic, Dusan and Gavrilovic-Wohlmuther, Aleksandra and Rogan, Jelena and Lačnjevac, Uroš C. and Jovanovic, Vladislava",
year = "2021",
abstract = "Pt, PtSn and PtSnO2 catalysts supported on high surface area carbon synthesized by microwave assisted polyol procedure were tested for methanol oxidation. Based on TGA, EDX and XRD analysis, PtSn/C is composed of Pt and Pt3Sn phase while the rest of Sn is present in a form of very small tin oxide particles. This paper focuses on structure-activity relationships for CO tolerance and methanol oxidation reactions after addition of Sn to Pt catalysts. Alloying of Sn with Pt improves the rate of CO oxidation despite the fact that the pure Sn does not react with CO and therefore activity for methanol oxidation increases similar to 2 times in comparison to Pt/C catalyst. PtSn/C catalyst shows small advantage in comparison with PtSnO2/C catalyst due to the alloyed Sn and its electronic effect. Long term stability tests also confirmed that PtSn/C catalyst is somewhat better in comparison to PtSnO2/C.",
journal = "International Journal of Electrochemical Science",
title = "Carbon Supported PtSn versus PtSnO2 Catalysts in Methanol Oxidation",
number = "2",
volume = "16",
doi = "10.20964/2021.02.55"
}

Stevanovic, S., Tripkovic, D., Gavrilovic-Wohlmuther, A., Rogan, J., Lačnjevac, U. C.,& Jovanovic, V.. (2021). Carbon Supported PtSn versus PtSnO2 Catalysts in Methanol Oxidation. in International Journal of Electrochemical Science, 16(2).
https://doi.org/10.20964/2021.02.55

Stevanovic S, Tripkovic D, Gavrilovic-Wohlmuther A, Rogan J, Lačnjevac UC, Jovanovic V. Carbon Supported PtSn versus PtSnO2 Catalysts in Methanol Oxidation. in International Journal of Electrochemical Science. 2021;16(2).
doi:10.20964/2021.02.55 .

Stevanovic, Sanja, Tripkovic, Dusan, Gavrilovic-Wohlmuther, Aleksandra, Rogan, Jelena, Lačnjevac, Uroš C., Jovanovic, Vladislava, "Carbon Supported PtSn versus PtSnO2 Catalysts in Methanol Oxidation" in International Journal of Electrochemical Science, 16, no. 2 (2021),
https://doi.org/10.20964/2021.02.55 . .

TY  - JOUR
AU  - Kovacina, Jovanka
AU  - Jegdic, Bore
AU  - Radojkovic, Bojana
AU  - Marunkic, Dunja
AU  - Stevanovic, Sanja
AU  - Simović, Anđela
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4964
AB  - The influence of microstructure and surface roughness of the X5CrNi18-10 austenitic stainless steel-welded joint on resistance to uniform, pitting, and intergranular corrosion, as well as on the stability of the passive film, was evaluated. The microstructure was revealed by optical microscopy and scanning electron microscopy, whereas surface topography and roughness levels were determined by atomic force microscopy. Corrosion characteristics were obtained by the electrochemical potentiokinetic reactivation method with double loop, electrochemical impedance spectroscopy method, as well as by potentiodynamic measurements. The degree of sensitization of heat-affected zone (HAZ) was significantly lower than the threshold value required for the occurrence of intergranular corrosion. However, HAZ showed a significantly greater tendency to pitting and uniform corrosion compared to weld metal and base metal. No effect of roughness levels (RMS from 3.6 to 54 nm) on the pitting potential value of the welded joint was observed (unlike in HAZ). The polished surface shows significantly higher corrosion resistance than the grinded surface. Generally, polishing improved corrosion resistance, especially in HAZ, which is very important because HAZ is a critical place for the occurrence of pitting and other types of corrosion.
T2  - Materials and Corrosion-Werkstoffe Und Korrosion
T1  - Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint
EP  - 1231
IS  - 7
SP  - 1215
VL  - 72
DO  - 10.1002/maco.202012241
ER  - 

@article{
author = "Kovacina, Jovanka and Jegdic, Bore and Radojkovic, Bojana and Marunkic, Dunja and Stevanovic, Sanja and Simović, Anđela",
year = "2021",
abstract = "The influence of microstructure and surface roughness of the X5CrNi18-10 austenitic stainless steel-welded joint on resistance to uniform, pitting, and intergranular corrosion, as well as on the stability of the passive film, was evaluated. The microstructure was revealed by optical microscopy and scanning electron microscopy, whereas surface topography and roughness levels were determined by atomic force microscopy. Corrosion characteristics were obtained by the electrochemical potentiokinetic reactivation method with double loop, electrochemical impedance spectroscopy method, as well as by potentiodynamic measurements. The degree of sensitization of heat-affected zone (HAZ) was significantly lower than the threshold value required for the occurrence of intergranular corrosion. However, HAZ showed a significantly greater tendency to pitting and uniform corrosion compared to weld metal and base metal. No effect of roughness levels (RMS from 3.6 to 54 nm) on the pitting potential value of the welded joint was observed (unlike in HAZ). The polished surface shows significantly higher corrosion resistance than the grinded surface. Generally, polishing improved corrosion resistance, especially in HAZ, which is very important because HAZ is a critical place for the occurrence of pitting and other types of corrosion.",
journal = "Materials and Corrosion-Werkstoffe Und Korrosion",
title = "Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint",
pages = "1231-1215",
number = "7",
volume = "72",
doi = "10.1002/maco.202012241"
}

Kovacina, J., Jegdic, B., Radojkovic, B., Marunkic, D., Stevanovic, S.,& Simović, A.. (2021). Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint. in Materials and Corrosion-Werkstoffe Und Korrosion, 72(7), 1215-1231.
https://doi.org/10.1002/maco.202012241

Kovacina J, Jegdic B, Radojkovic B, Marunkic D, Stevanovic S, Simović A. Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint. in Materials and Corrosion-Werkstoffe Und Korrosion. 2021;72(7):1215-1231.
doi:10.1002/maco.202012241 .

Kovacina, Jovanka, Jegdic, Bore, Radojkovic, Bojana, Marunkic, Dunja, Stevanovic, Sanja, Simović, Anđela, "Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint" in Materials and Corrosion-Werkstoffe Und Korrosion, 72, no. 7 (2021):1215-1231,
https://doi.org/10.1002/maco.202012241 . .

TY  - JOUR
AU  - Volkov-Husović, Tatjana
AU  - Ivanic, Ivana
AU  - Kozuh, Stjepan
AU  - Stevanovic, Sanja
AU  - Vlahovic, Milica
AU  - Martinovic, Sanja
AU  - Stopic, Srecko
AU  - Gojic, Mirko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4862
AB  - Microstructural and cavitation erosion testing was carried out on Cu-12.8Al-4.1Ni (wt. %) shape memory alloy (SMA) samples produced by continuous casting followed by heat treatment consisting of solution annealing at 885 degrees C for 60 min and, later, water quenching. Cavitation resistance testing was applied using a standard ultrasonic vibratory cavitation set up with stationary specimen. Surface changes during the cavitation were monitored by metallographic analysis using an optical microscope (OM), atomic force microscope (AFM), and scanning electron microscope (SEM) as well as by weight measurements. The results revealed a martensite microstructure after both casting and quenching. Microhardness value was higher after water quenching than in the as-cast state. After 420 min of cavitation exposure, a negligible mass loss was noticed for both samples. Based on the obtained results, both samples showed excellent cavitation resistance. Mass loss and morphological analysis of the formed pits indicated better cavitation resistance for the as-cast state (L).
T2  - Metals
T1  - Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy
IS  - 7
VL  - 11
DO  - 10.3390/met11070997
ER  - 

@article{
author = "Volkov-Husović, Tatjana and Ivanic, Ivana and Kozuh, Stjepan and Stevanovic, Sanja and Vlahovic, Milica and Martinovic, Sanja and Stopic, Srecko and Gojic, Mirko",
year = "2021",
abstract = "Microstructural and cavitation erosion testing was carried out on Cu-12.8Al-4.1Ni (wt. %) shape memory alloy (SMA) samples produced by continuous casting followed by heat treatment consisting of solution annealing at 885 degrees C for 60 min and, later, water quenching. Cavitation resistance testing was applied using a standard ultrasonic vibratory cavitation set up with stationary specimen. Surface changes during the cavitation were monitored by metallographic analysis using an optical microscope (OM), atomic force microscope (AFM), and scanning electron microscope (SEM) as well as by weight measurements. The results revealed a martensite microstructure after both casting and quenching. Microhardness value was higher after water quenching than in the as-cast state. After 420 min of cavitation exposure, a negligible mass loss was noticed for both samples. Based on the obtained results, both samples showed excellent cavitation resistance. Mass loss and morphological analysis of the formed pits indicated better cavitation resistance for the as-cast state (L).",
journal = "Metals",
title = "Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy",
number = "7",
volume = "11",
doi = "10.3390/met11070997"
}

Volkov-Husović, T., Ivanic, I., Kozuh, S., Stevanovic, S., Vlahovic, M., Martinovic, S., Stopic, S.,& Gojic, M.. (2021). Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy. in Metals, 11(7).
https://doi.org/10.3390/met11070997

Volkov-Husović T, Ivanic I, Kozuh S, Stevanovic S, Vlahovic M, Martinovic S, Stopic S, Gojic M. Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy. in Metals. 2021;11(7).
doi:10.3390/met11070997 .

Volkov-Husović, Tatjana, Ivanic, Ivana, Kozuh, Stjepan, Stevanovic, Sanja, Vlahovic, Milica, Martinovic, Sanja, Stopic, Srecko, Gojic, Mirko, "Microstructural and Cavitation Erosion Behavior of the CuAlNi Shape Memory Alloy" in Metals, 11, no. 7 (2021),
https://doi.org/10.3390/met11070997 . .