Kovačina, Jovanka N.

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  • Kovačina, Jovanka N. (5)
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Author's Bibliography

Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6

Kovačina, Jovanka N.; Marunkić, Dunja D.; Simović, Anđela; Radojković, Bojana; Jegdić, Bore; Marinković, Aleksandar

(Belgrade : Military Technical Institute, 2020)

TY  - CONF
AU  - Kovačina, Jovanka N.
AU  - Marunkić, Dunja D.
AU  - Simović, Anđela
AU  - Radojković, Bojana
AU  - Jegdić, Bore
AU  - Marinković, Aleksandar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4409
AB  - Aluminium AA7075 alloy with its low density and good mechanical properties, widely responds to the requirements of aerospace, navy, and defense industries. However, corrosion is the most common problem that affects the reliability and service life of components and constructions based on this alloy. One of the most practical methods for protecting metals from corrosion is the use of inhibitors. Chromates are known as excellent inhibitors but chromate compounds are highly toxic, carcinogenic, and thus hazardous to humans and the environment. The aim of this study was to synthesize an organic eco-friendly compound (cerium-cysteine) and to investigate its inhibitory property on aluminum alloy AA7075-T6. Rare-earth metals are effective and environmentally friendly substances for aluminium protection as well as cysteine that can be found in many proteins and enzymes such as the keratin in hair. The synthesized inhibitor was confirmed and analyzed by FTIR. The survey of samples corrosion resistance was conducted by three electrochemical methods: linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and polarization measurements (Epit) in a 0.1M NaCl solution at room temperature. Different concentrations of ceriumcysteine were used to find the best efficiency. The best results were then tested for time dependence (up to 72 h). The inhibitory effectiveness of the cerium complex is shown to depend on a variety of factors such as concentration and time dependence.
PB  - Belgrade : Military Technical Institute
C3  - 9th International Scientific Conference od Defensive Technologies OTEH 2020
T1  - Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4409
ER  - 
@conference{
author = "Kovačina, Jovanka N. and Marunkić, Dunja D. and Simović, Anđela and Radojković, Bojana and Jegdić, Bore and Marinković, Aleksandar",
year = "2020",
abstract = "Aluminium AA7075 alloy with its low density and good mechanical properties, widely responds to the requirements of aerospace, navy, and defense industries. However, corrosion is the most common problem that affects the reliability and service life of components and constructions based on this alloy. One of the most practical methods for protecting metals from corrosion is the use of inhibitors. Chromates are known as excellent inhibitors but chromate compounds are highly toxic, carcinogenic, and thus hazardous to humans and the environment. The aim of this study was to synthesize an organic eco-friendly compound (cerium-cysteine) and to investigate its inhibitory property on aluminum alloy AA7075-T6. Rare-earth metals are effective and environmentally friendly substances for aluminium protection as well as cysteine that can be found in many proteins and enzymes such as the keratin in hair. The synthesized inhibitor was confirmed and analyzed by FTIR. The survey of samples corrosion resistance was conducted by three electrochemical methods: linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and polarization measurements (Epit) in a 0.1M NaCl solution at room temperature. Different concentrations of ceriumcysteine were used to find the best efficiency. The best results were then tested for time dependence (up to 72 h). The inhibitory effectiveness of the cerium complex is shown to depend on a variety of factors such as concentration and time dependence.",
publisher = "Belgrade : Military Technical Institute",
journal = "9th International Scientific Conference od Defensive Technologies OTEH 2020",
title = "Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4409"
}
Kovačina, J. N., Marunkić, D. D., Simović, A., Radojković, B., Jegdić, B.,& Marinković, A.. (2020). Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6. in 9th International Scientific Conference od Defensive Technologies OTEH 2020
Belgrade : Military Technical Institute..
https://hdl.handle.net/21.15107/rcub_technorep_4409
Kovačina JN, Marunkić DD, Simović A, Radojković B, Jegdić B, Marinković A. Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6. in 9th International Scientific Conference od Defensive Technologies OTEH 2020. 2020;.
https://hdl.handle.net/21.15107/rcub_technorep_4409 .
Kovačina, Jovanka N., Marunkić, Dunja D., Simović, Anđela, Radojković, Bojana, Jegdić, Bore, Marinković, Aleksandar, "Cerium-cysteine complex inhibitor for aluminium alloy AA7075-T6" in 9th International Scientific Conference od Defensive Technologies OTEH 2020 (2020),
https://hdl.handle.net/21.15107/rcub_technorep_4409 .

Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići

Jovanović, Aleksandar; Kovačina, Jovanka N.; Marinković, Aleksandar; Onjia, Antonije; Povrenović, Dragan; Trišović, Tomislav

(University of Belgrade, Faculty of Technology and Metallurgy, 2019)


                                            

                                            
Jovanović, A., Kovačina, J. N., Marinković, A., Onjia, A., Povrenović, D.,& Trišović, T.. (2019). Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići. 
University of Belgrade, Faculty of Technology and Metallurgy..
https://hdl.handle.net/21.15107/rcub_technorep_4176
Jovanović A, Kovačina JN, Marinković A, Onjia A, Povrenović D, Trišović T. Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići. 2019;.
https://hdl.handle.net/21.15107/rcub_technorep_4176 .
Jovanović, Aleksandar, Kovačina, Jovanka N., Marinković, Aleksandar, Onjia, Antonije, Povrenović, Dragan, Trišović, Tomislav, "Optimizacija procesa prečišćavanja otpadnih voda iz Fabrike streljačke municije Uzići" (2019),
https://hdl.handle.net/21.15107/rcub_technorep_4176 .

Razvoj novih antikorozivnih organo-metalnih jedinjenja na bazi Cerijuma za primenu u alkidnim premazima

Marinković, Aleksandar; Tomić, Nataša; Vuksanović, Marija M.; Kovačina, Jovanka N.; Marunkić, Dunja D.; Milošević, Milena D.; Perendija, Jovana

(Univerzitet u Beogradu, Tehnološko-metalurški fakultet, 2019)


                                            

                                            
Marinković, A., Tomić, N., Vuksanović, M. M., Kovačina, J. N., Marunkić, D. D., Milošević, M. D.,& Perendija, J.. (2019). Razvoj novih antikorozivnih organo-metalnih jedinjenja na bazi Cerijuma za primenu u alkidnim premazima. 
Univerzitet u Beogradu, Tehnološko-metalurški fakultet..
https://hdl.handle.net/21.15107/rcub_technorep_4148
Marinković A, Tomić N, Vuksanović MM, Kovačina JN, Marunkić DD, Milošević MD, Perendija J. Razvoj novih antikorozivnih organo-metalnih jedinjenja na bazi Cerijuma za primenu u alkidnim premazima. 2019;.
https://hdl.handle.net/21.15107/rcub_technorep_4148 .
Marinković, Aleksandar, Tomić, Nataša, Vuksanović, Marija M., Kovačina, Jovanka N., Marunkić, Dunja D., Milošević, Milena D., Perendija, Jovana, "Razvoj novih antikorozivnih organo-metalnih jedinjenja na bazi Cerijuma za primenu u alkidnim premazima" (2019),
https://hdl.handle.net/21.15107/rcub_technorep_4148 .

Purification of waste water using ozonization

Kovačina, Jovanka N.; Milošević, Milena D.; Božić, Aleksandra R.; Jovanović, Aleksandar; Marinković, Aleksandar; Onjia, Antonije; Povrenović, Dragan

(Beograd : Beogradska politehnika, 2019)

TY  - CONF
AU  - Kovačina, Jovanka N.
AU  - Milošević, Milena D.
AU  - Božić, Aleksandra R.
AU  - Jovanović, Aleksandar
AU  - Marinković, Aleksandar
AU  - Onjia, Antonije
AU  - Povrenović, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4171
AB  - Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum).
AB  - Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).
PB  - Beograd : Beogradska politehnika
C3  - Zbornik radova - Peti naučno-stručni skup politehnika
T1  - Purification of waste water using ozonization
T1  - Prečišćavanje otpadnih voda primenom ozonizacije
EP  - 147
SP  - 142
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4171
ER  - 
@conference{
author = "Kovačina, Jovanka N. and Milošević, Milena D. and Božić, Aleksandra R. and Jovanović, Aleksandar and Marinković, Aleksandar and Onjia, Antonije and Povrenović, Dragan",
year = "2019",
abstract = "Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum)., Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).",
publisher = "Beograd : Beogradska politehnika",
journal = "Zbornik radova - Peti naučno-stručni skup politehnika",
title = "Purification of waste water using ozonization, Prečišćavanje otpadnih voda primenom ozonizacije",
pages = "147-142",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4171"
}
Kovačina, J. N., Milošević, M. D., Božić, A. R., Jovanović, A., Marinković, A., Onjia, A.,& Povrenović, D.. (2019). Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika
Beograd : Beogradska politehnika., 142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171
Kovačina JN, Milošević MD, Božić AR, Jovanović A, Marinković A, Onjia A, Povrenović D. Purification of waste water using ozonization. in Zbornik radova - Peti naučno-stručni skup politehnika. 2019;:142-147.
https://hdl.handle.net/21.15107/rcub_technorep_4171 .
Kovačina, Jovanka N., Milošević, Milena D., Božić, Aleksandra R., Jovanović, Aleksandar, Marinković, Aleksandar, Onjia, Antonije, Povrenović, Dragan, "Purification of waste water using ozonization" in Zbornik radova - Peti naučno-stručni skup politehnika (2019):142-147,
https://hdl.handle.net/21.15107/rcub_technorep_4171 .

Modified tannins for alkyd based anticorrosive coatings

Milošević, Milena D.; Daničić, Dunja; Kovačina, Jovanka N.; Bugarčić, Mladen; Rusmirović, Jelena; Kovačević, Tihomir; Marinković, Aleksandar

(Engineering Society for Corrosion, Belgrade, Serbia, 2019)

TY  - JOUR
AU  - Milošević, Milena D.
AU  - Daničić, Dunja
AU  - Kovačina, Jovanka N.
AU  - Bugarčić, Mladen
AU  - Rusmirović, Jelena
AU  - Kovačević, Tihomir
AU  - Marinković, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4271
AB  - The study of the synthesis of anticorrosive inhibitors, based on chemically modified tannins, and their use in alkyd based coatings to improve anticorrosive properties is presented in this work. Two methods of tannin modification were applied: direct method using ammonium hydroxide, ammonium hydroxide/ammonium chloride buffer or diethylenetriamine (DETA); and a two-step method including tannin modification with epichlorohydrin (ECH) in first step to produce epoxy modified tannin, ET, and further modification with heteroaromatic amines or linseed oil fatty acids (LFA) in second step. The obtained anticorrosive additives were characterized using ATR-FTIR, 1H and 13C NMR spectroscopies and elemental analysis. Epoxy, amino, hydroxyl, acid and iodine values of the synthesized inhibitors were determined according to standard methods. The prepared alkyd coating with tannin inhibitors was tested according to standard SRPS EN ISO 4628 method. Anticorrosive coating containing modified tannin based additive showed increased anticorrosive properties, good adhesion and coverage comparing to the coating with zinc phosphate additive. The alkyd coating films based on ET-LFA and ET modified with 2-amino-5-mercapto-1,3,4-thiadiazole showed best anticorrosive results.
AB  - U ovom radu prikazana je sinteza antikorozionih aditiva na bazi hemijski modifikovanog tanina i njihova primena u alkidnim premazima u cilju poboljšanja antikorozionih svojstava. Prikazane su dve metode modifikacije tanina: direktna modifikacija tanina primenom amonijum-hidroksida, amonijum-hidroksid/amonijum-hlorid pufera ili dietilentriamina (DETA); i dvostepena modifikacija tanina koja u prvom stupnju uključuje modifikaciju epihlorhidrinom sa ciljem da se dobije tannin sa epoksi terminiranim funkcionalnim grupama, ET, i modifikaciju ET tanina sa heteroaromatičnim aminima ili masnim kiselinama izolovanim iz lanenog ulja (LFA) u drugom stupnju. Sintetisani antikorozioni aditivi su okarakterisani primenom ATR-FTIR, 1H i 13C NMR spektroskopija, i elementalnom analizom. Sadržaj epoksi, amino, hidroksilnih i karboksilnih grupa i vrednost jodnog broja sintetisanih aditiva određen je prema standardnim metodama. Alkidni premazi koji sadrže antikorozione aditive na bazi modifikovanog tanina ispitani su prema standardnoj SRPS EN ISO 4628 metodi. Antikorozivni alkidni premazi na bazi modfikovanih tanina pokazali su poboljšane antikorozione karakteristike i adheziju u poređenju sa alkidnim premazom na bazi cink-fosfata. Alkidni premazi koji sadrže dvostepeno modifikovani tanin sa LFA i 2-amino-5-merkapto-1,3,4-tiadiazolom pokazali su najbolje antikorozione karakteristike.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Modified tannins for alkyd based anticorrosive coatings
T1  - Primena modifikovanih tanina u antikorozionim alkidnim premazima
EP  - 95
IS  - 1
SP  - 81
VL  - 60
DO  - 10.5937/zasmat1901081M
ER  - 
@article{
author = "Milošević, Milena D. and Daničić, Dunja and Kovačina, Jovanka N. and Bugarčić, Mladen and Rusmirović, Jelena and Kovačević, Tihomir and Marinković, Aleksandar",
year = "2019",
abstract = "The study of the synthesis of anticorrosive inhibitors, based on chemically modified tannins, and their use in alkyd based coatings to improve anticorrosive properties is presented in this work. Two methods of tannin modification were applied: direct method using ammonium hydroxide, ammonium hydroxide/ammonium chloride buffer or diethylenetriamine (DETA); and a two-step method including tannin modification with epichlorohydrin (ECH) in first step to produce epoxy modified tannin, ET, and further modification with heteroaromatic amines or linseed oil fatty acids (LFA) in second step. The obtained anticorrosive additives were characterized using ATR-FTIR, 1H and 13C NMR spectroscopies and elemental analysis. Epoxy, amino, hydroxyl, acid and iodine values of the synthesized inhibitors were determined according to standard methods. The prepared alkyd coating with tannin inhibitors was tested according to standard SRPS EN ISO 4628 method. Anticorrosive coating containing modified tannin based additive showed increased anticorrosive properties, good adhesion and coverage comparing to the coating with zinc phosphate additive. The alkyd coating films based on ET-LFA and ET modified with 2-amino-5-mercapto-1,3,4-thiadiazole showed best anticorrosive results., U ovom radu prikazana je sinteza antikorozionih aditiva na bazi hemijski modifikovanog tanina i njihova primena u alkidnim premazima u cilju poboljšanja antikorozionih svojstava. Prikazane su dve metode modifikacije tanina: direktna modifikacija tanina primenom amonijum-hidroksida, amonijum-hidroksid/amonijum-hlorid pufera ili dietilentriamina (DETA); i dvostepena modifikacija tanina koja u prvom stupnju uključuje modifikaciju epihlorhidrinom sa ciljem da se dobije tannin sa epoksi terminiranim funkcionalnim grupama, ET, i modifikaciju ET tanina sa heteroaromatičnim aminima ili masnim kiselinama izolovanim iz lanenog ulja (LFA) u drugom stupnju. Sintetisani antikorozioni aditivi su okarakterisani primenom ATR-FTIR, 1H i 13C NMR spektroskopija, i elementalnom analizom. Sadržaj epoksi, amino, hidroksilnih i karboksilnih grupa i vrednost jodnog broja sintetisanih aditiva određen je prema standardnim metodama. Alkidni premazi koji sadrže antikorozione aditive na bazi modifikovanog tanina ispitani su prema standardnoj SRPS EN ISO 4628 metodi. Antikorozivni alkidni premazi na bazi modfikovanih tanina pokazali su poboljšane antikorozione karakteristike i adheziju u poređenju sa alkidnim premazom na bazi cink-fosfata. Alkidni premazi koji sadrže dvostepeno modifikovani tanin sa LFA i 2-amino-5-merkapto-1,3,4-tiadiazolom pokazali su najbolje antikorozione karakteristike.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Modified tannins for alkyd based anticorrosive coatings, Primena modifikovanih tanina u antikorozionim alkidnim premazima",
pages = "95-81",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901081M"
}
Milošević, M. D., Daničić, D., Kovačina, J. N., Bugarčić, M., Rusmirović, J., Kovačević, T.,& Marinković, A.. (2019). Modified tannins for alkyd based anticorrosive coatings. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 81-95.
https://doi.org/10.5937/zasmat1901081M
Milošević MD, Daničić D, Kovačina JN, Bugarčić M, Rusmirović J, Kovačević T, Marinković A. Modified tannins for alkyd based anticorrosive coatings. in Zaštita materijala. 2019;60(1):81-95.
doi:10.5937/zasmat1901081M .
Milošević, Milena D., Daničić, Dunja, Kovačina, Jovanka N., Bugarčić, Mladen, Rusmirović, Jelena, Kovačević, Tihomir, Marinković, Aleksandar, "Modified tannins for alkyd based anticorrosive coatings" in Zaštita materijala, 60, no. 1 (2019):81-95,
https://doi.org/10.5937/zasmat1901081M . .
2