The influence of the polyaniline coatings on corrosion protection of mild steel in different environments
Subject and scientific goal of this dissertation was to investigate the corrosion behavior of mild steel as the most widespread and the price very acceptable structural material based on polyaniline coatings in different corrosive environments: corrosion in sea water (3% NaCl), atmospheric corrosion...
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| description | Subject and scientific goal of this dissertation was to investigate the corrosion behavior of mild steel as the most widespread and the price very acceptable structural material based on polyaniline coatings in different corrosive environments: corrosion in sea water (3% NaCl), atmospheric corrosion and corrosion in soil (Sahara sand). In the first part was investigated the electrodeposition of polyaniline using galvanostatic technique on mild steel in of sodium benzoate solution in order to determine the corrosion behavior. It was also examined the potential role of polyaniline coating in cathodic protection of mild steel, especially in the case of the failure, and it was found that partial polyaniline coatings provide adequate corrosion protection. It was shown that partial polyaniline films can offer good corrosion protection of mild steel in Sahara sand and against atmospheric corrosion. Based on these studies of a model system, the „switching zone mechanism” has been proposed. For the first time it was discovered that corrosion processes of mild steel covered with polyaniline is affected with light, even the mild illumination was applied (4 mW cm-2). Since the electrochemical method of of synthesis on mild steel is suitable only for relatively small objects, in the second part of the dissertation has investigated the electrochemical and chemical synthesis polyaniline powder. In this sense, it is determined the yield of the synthesis, the obtained form of polyaniline and its morphology. By the chemical dedoping and doping, polyaniline powder was formed in the form of emeraldine salts or emeraldin base, since there is controversy in the literature which form gives better protection against corrosion of the mild steel. With such obtained and characterized powders the composite coatings with different content of PANI powder (1-10 wt%) was prepared, and applied on the mild steel samples, and the corrosion behavior was investigated using electrochemical impedance technique and the method of moist chamber for samples with artificially induced defects. It was found that chemically synthesized polyaniline in the form of emeraldin salts offers the best protection with the optimal concentration of polyaniline about 5 wt.%. The content of phenazine and azane determined by UV-vis spectroscopy in the investigated samples are connected with corrosion protection ability. The proposed mechanism of corrosion protection of mild steel in a real system was also confirmed. |
| format | Dissertation |
| fullrecord | <record><control><sourceid>europeana_1GC</sourceid><recordid>TN_cdi_europeana_collections_9200447_BibliographicResource_3000095542609</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>9200447_BibliographicResource_3000095542609</sourcerecordid><originalsourceid>FETCH-europeana_collections_9200447_BibliographicResource_30000955426093</originalsourceid><addsrcrecordid>eNqtjE0KwjAQhbtxIeodcgEh9EfpVlG6FvclppN2YDoTklTw9kb0CL7N-3jwvnWB9wkUsqMF2IISp1IevNDLMBIyKCsmIY9RCWcOQSJm8kES2PTB_JmRBhUTAGWXGtA5CMBJAT8xCM-Z47ZYOUMRdr_eFN31cj93e1iCeDBseitEX2ns21Lruj72J3wQyhiMn9DeIMoSLPSVzmmbpi4Puq3-qHoD0yRdkA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>dissertation</recordtype></control><display><type>dissertation</type><title>The influence of the polyaniline coatings on corrosion protection of mild steel in different environments</title><source>Europeana Collections</source><creator>Alkais Ali</creator><creatorcontrib>Alkais Ali ; Grgur Branimir ; Jugović Branimir ; Gvozdenović Milica</creatorcontrib><description>Subject and scientific goal of this dissertation was to investigate the corrosion behavior of mild steel as the most widespread and the price very acceptable structural material based on polyaniline coatings in different corrosive environments: corrosion in sea water (3% NaCl), atmospheric corrosion and corrosion in soil (Sahara sand). In the first part was investigated the electrodeposition of polyaniline using galvanostatic technique on mild steel in of sodium benzoate solution in order to determine the corrosion behavior. It was also examined the potential role of polyaniline coating in cathodic protection of mild steel, especially in the case of the failure, and it was found that partial polyaniline coatings provide adequate corrosion protection. It was shown that partial polyaniline films can offer good corrosion protection of mild steel in Sahara sand and against atmospheric corrosion. Based on these studies of a model system, the „switching zone mechanism” has been proposed. For the first time it was discovered that corrosion processes of mild steel covered with polyaniline is affected with light, even the mild illumination was applied (4 mW cm-2). Since the electrochemical method of of synthesis on mild steel is suitable only for relatively small objects, in the second part of the dissertation has investigated the electrochemical and chemical synthesis polyaniline powder. In this sense, it is determined the yield of the synthesis, the obtained form of polyaniline and its morphology. By the chemical dedoping and doping, polyaniline powder was formed in the form of emeraldine salts or emeraldin base, since there is controversy in the literature which form gives better protection against corrosion of the mild steel. With such obtained and characterized powders the composite coatings with different content of PANI powder (1-10 wt%) was prepared, and applied on the mild steel samples, and the corrosion behavior was investigated using electrochemical impedance technique and the method of moist chamber for samples with artificially induced defects. It was found that chemically synthesized polyaniline in the form of emeraldin salts offers the best protection with the optimal concentration of polyaniline about 5 wt.%. The content of phenazine and azane determined by UV-vis spectroscopy in the investigated samples are connected with corrosion protection ability. The proposed mechanism of corrosion protection of mild steel in a real system was also confirmed.
Predmet i naučni cilj rada ove doktorske disertacije je bilo ispitivanje korozionog ponašanja mekog čelika kao najraširenijeg i po ceni veoma prihvatljivog konstrukcionog materijala sa prevlakama na bazi polianilina u različitim korozionim sredinama: korozija u morskoj vodi (3% NaCl), atmosferskoj koroziji i koroziji u zemljištu (Saharski pesak). U prvom delu je ispitivano elektrohemijsko taloženje polianilina galvanostatskom tehnikom na mekom čeliku iy rastvora natrijum-benzoata u cilju određivanje korozionog ponašanja. Takođe, ispitivana je i potencijalna uloga prevlaka polianilina u katodnoj zaštiti mekog čelika, posebno u slučajevima njenog otkazivanja i ustanovljeno je da parcijalna prevlaka polianilina pruža adekvatnu zaštitu od korozije. Pokazano je da delimično naneta prevlaka polianilina ostvaruje dobru zaštitu od korozije čelika u pesku Sahare i od atmosferske korozije Na osnovu ovih ispitivanja, kao model sistema, predložen je mehanizam zamene katodnih i anodnih zona. Po prvi put je otkriveno da i relativno blego osvetljenje (4 mW cm-2) ima uticaja na koroziju čelika prekrivenog polianilinom. Sa obzirom da je elektrohemijski metod sinteze polianilina na mekom čeliku pogodan samo za relativno male predmete, u drugom delu disertacije je ispitivano elektrohemijsko i hemijsko dobijanje prahova polianilina. U tom smislu je određen prinos sinteze, oblik dobijenog polianilina i njegova morfologija. Primenom metoda hemijskog dedopovanja i dopovanja dobijeni su uzorci elektrohemijski odnosno hemijski formiranih prahova u obliku emeraldin soli odnosno emeraldin baze, pošto u literaturi postoje kontraverze koji oblik pruža bolju zaštitu od korozije mekom čeliku. Sa tako dobijenim, okarakterisanim prahovima priprmljene su kompozitna premazna sredstva sa različitim sadržajem prah polianilina (1-10 mas%). Ovakvim premaznim sredstvima su bili zaštićeni uzorci mekog čelika, a koroziono ponašanje je ispitivano primenom elektrohemijske impedansne tehnike i metodom vlažne komore za uzorke sa veštački izazvanim oštećenjima. Ustanovljeno je da hemijski sintetisani polianilin u obliku emeraldin soli pruža najbolju zaštitu pri čemu je optimalna koncentracija polianilina oko 5 mas.%. Primenom UV-vis spektroskopije pokazano je da sadržaj fenazina i anizina u strukturi polianilina određuje kvalitet antikorozione zaštite. Takođe, je potvrđen i predloženi mehanizam zaštite od korozije mekog čelika na realnom sistemu.</description><language>srp</language><publisher>University of Belgrade, Faculty of Technology and Metallurgy</publisher><subject>benzoates ; benzoati ; cathodic protection ; composite coatings ; corrosion ; katodna zaštita ; kompozitne prevlake ; korozija ; meki čelik ; mild steel ; polianilin ; polyaniline</subject><creationdate>2013</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://data.europeana.eu/item/9200447/BibliographicResource_3000095542609$$EHTML$$P50$$Geuropeana$$Hfree_for_read</linktohtml><link.rule.ids>311,780,38515,75946</link.rule.ids><linktorsrc>$$Uhttps://data.europeana.eu/item/9200447/BibliographicResource_3000095542609$$EView_record_in_Europeana$$FView_record_in_$$GEuropeana$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Alkais Ali</creatorcontrib><title>The influence of the polyaniline coatings on corrosion protection of mild steel in different environments</title><description>Subject and scientific goal of this dissertation was to investigate the corrosion behavior of mild steel as the most widespread and the price very acceptable structural material based on polyaniline coatings in different corrosive environments: corrosion in sea water (3% NaCl), atmospheric corrosion and corrosion in soil (Sahara sand). In the first part was investigated the electrodeposition of polyaniline using galvanostatic technique on mild steel in of sodium benzoate solution in order to determine the corrosion behavior. It was also examined the potential role of polyaniline coating in cathodic protection of mild steel, especially in the case of the failure, and it was found that partial polyaniline coatings provide adequate corrosion protection. It was shown that partial polyaniline films can offer good corrosion protection of mild steel in Sahara sand and against atmospheric corrosion. Based on these studies of a model system, the „switching zone mechanism” has been proposed. For the first time it was discovered that corrosion processes of mild steel covered with polyaniline is affected with light, even the mild illumination was applied (4 mW cm-2). Since the electrochemical method of of synthesis on mild steel is suitable only for relatively small objects, in the second part of the dissertation has investigated the electrochemical and chemical synthesis polyaniline powder. In this sense, it is determined the yield of the synthesis, the obtained form of polyaniline and its morphology. By the chemical dedoping and doping, polyaniline powder was formed in the form of emeraldine salts or emeraldin base, since there is controversy in the literature which form gives better protection against corrosion of the mild steel. With such obtained and characterized powders the composite coatings with different content of PANI powder (1-10 wt%) was prepared, and applied on the mild steel samples, and the corrosion behavior was investigated using electrochemical impedance technique and the method of moist chamber for samples with artificially induced defects. It was found that chemically synthesized polyaniline in the form of emeraldin salts offers the best protection with the optimal concentration of polyaniline about 5 wt.%. The content of phenazine and azane determined by UV-vis spectroscopy in the investigated samples are connected with corrosion protection ability. The proposed mechanism of corrosion protection of mild steel in a real system was also confirmed.
Predmet i naučni cilj rada ove doktorske disertacije je bilo ispitivanje korozionog ponašanja mekog čelika kao najraširenijeg i po ceni veoma prihvatljivog konstrukcionog materijala sa prevlakama na bazi polianilina u različitim korozionim sredinama: korozija u morskoj vodi (3% NaCl), atmosferskoj koroziji i koroziji u zemljištu (Saharski pesak). U prvom delu je ispitivano elektrohemijsko taloženje polianilina galvanostatskom tehnikom na mekom čeliku iy rastvora natrijum-benzoata u cilju određivanje korozionog ponašanja. Takođe, ispitivana je i potencijalna uloga prevlaka polianilina u katodnoj zaštiti mekog čelika, posebno u slučajevima njenog otkazivanja i ustanovljeno je da parcijalna prevlaka polianilina pruža adekvatnu zaštitu od korozije. Pokazano je da delimično naneta prevlaka polianilina ostvaruje dobru zaštitu od korozije čelika u pesku Sahare i od atmosferske korozije Na osnovu ovih ispitivanja, kao model sistema, predložen je mehanizam zamene katodnih i anodnih zona. Po prvi put je otkriveno da i relativno blego osvetljenje (4 mW cm-2) ima uticaja na koroziju čelika prekrivenog polianilinom. Sa obzirom da je elektrohemijski metod sinteze polianilina na mekom čeliku pogodan samo za relativno male predmete, u drugom delu disertacije je ispitivano elektrohemijsko i hemijsko dobijanje prahova polianilina. U tom smislu je određen prinos sinteze, oblik dobijenog polianilina i njegova morfologija. Primenom metoda hemijskog dedopovanja i dopovanja dobijeni su uzorci elektrohemijski odnosno hemijski formiranih prahova u obliku emeraldin soli odnosno emeraldin baze, pošto u literaturi postoje kontraverze koji oblik pruža bolju zaštitu od korozije mekom čeliku. Sa tako dobijenim, okarakterisanim prahovima priprmljene su kompozitna premazna sredstva sa različitim sadržajem prah polianilina (1-10 mas%). Ovakvim premaznim sredstvima su bili zaštićeni uzorci mekog čelika, a koroziono ponašanje je ispitivano primenom elektrohemijske impedansne tehnike i metodom vlažne komore za uzorke sa veštački izazvanim oštećenjima. Ustanovljeno je da hemijski sintetisani polianilin u obliku emeraldin soli pruža najbolju zaštitu pri čemu je optimalna koncentracija polianilina oko 5 mas.%. Primenom UV-vis spektroskopije pokazano je da sadržaj fenazina i anizina u strukturi polianilina određuje kvalitet antikorozione zaštite. Takođe, je potvrđen i predloženi mehanizam zaštite od korozije mekog čelika na realnom sistemu.</description><subject>benzoates</subject><subject>benzoati</subject><subject>cathodic protection</subject><subject>composite coatings</subject><subject>corrosion</subject><subject>katodna zaštita</subject><subject>kompozitne prevlake</subject><subject>korozija</subject><subject>meki čelik</subject><subject>mild steel</subject><subject>polianilin</subject><subject>polyaniline</subject><fulltext>true</fulltext><rsrctype>dissertation</rsrctype><creationdate>2013</creationdate><recordtype>dissertation</recordtype><sourceid>1GC</sourceid><recordid>eNqtjE0KwjAQhbtxIeodcgEh9EfpVlG6FvclppN2YDoTklTw9kb0CL7N-3jwvnWB9wkUsqMF2IISp1IevNDLMBIyKCsmIY9RCWcOQSJm8kES2PTB_JmRBhUTAGWXGtA5CMBJAT8xCM-Z47ZYOUMRdr_eFN31cj93e1iCeDBseitEX2ns21Lruj72J3wQyhiMn9DeIMoSLPSVzmmbpi4Puq3-qHoD0yRdkA</recordid><startdate>20131126</startdate><enddate>20131126</enddate><creator>Alkais Ali</creator><general>University of Belgrade, Faculty of Technology and Metallurgy</general><scope>1GC</scope></search><sort><creationdate>20131126</creationdate><title>The influence of the polyaniline coatings on corrosion protection of mild steel in different environments</title><author>Alkais Ali</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-europeana_collections_9200447_BibliographicResource_30000955426093</frbrgroupid><rsrctype>dissertations</rsrctype><prefilter>dissertations</prefilter><language>srp</language><creationdate>2013</creationdate><topic>benzoates</topic><topic>benzoati</topic><topic>cathodic protection</topic><topic>composite coatings</topic><topic>corrosion</topic><topic>katodna zaštita</topic><topic>kompozitne prevlake</topic><topic>korozija</topic><topic>meki čelik</topic><topic>mild steel</topic><topic>polianilin</topic><topic>polyaniline</topic><toplevel>online_resources</toplevel><creatorcontrib>Alkais Ali</creatorcontrib><collection>Europeana Collections</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Alkais Ali</au><format>dissertation</format><genre>dissertation</genre><ristype>THES</ristype><Advisor>Grgur Branimir</Advisor><Advisor>Jugović Branimir</Advisor><Advisor>Gvozdenović Milica</Advisor><btitle>The influence of the polyaniline coatings on corrosion protection of mild steel in different environments</btitle><date>2013-11-26</date><risdate>2013</risdate><abstract>Subject and scientific goal of this dissertation was to investigate the corrosion behavior of mild steel as the most widespread and the price very acceptable structural material based on polyaniline coatings in different corrosive environments: corrosion in sea water (3% NaCl), atmospheric corrosion and corrosion in soil (Sahara sand). In the first part was investigated the electrodeposition of polyaniline using galvanostatic technique on mild steel in of sodium benzoate solution in order to determine the corrosion behavior. It was also examined the potential role of polyaniline coating in cathodic protection of mild steel, especially in the case of the failure, and it was found that partial polyaniline coatings provide adequate corrosion protection. It was shown that partial polyaniline films can offer good corrosion protection of mild steel in Sahara sand and against atmospheric corrosion. Based on these studies of a model system, the „switching zone mechanism” has been proposed. For the first time it was discovered that corrosion processes of mild steel covered with polyaniline is affected with light, even the mild illumination was applied (4 mW cm-2). Since the electrochemical method of of synthesis on mild steel is suitable only for relatively small objects, in the second part of the dissertation has investigated the electrochemical and chemical synthesis polyaniline powder. In this sense, it is determined the yield of the synthesis, the obtained form of polyaniline and its morphology. By the chemical dedoping and doping, polyaniline powder was formed in the form of emeraldine salts or emeraldin base, since there is controversy in the literature which form gives better protection against corrosion of the mild steel. With such obtained and characterized powders the composite coatings with different content of PANI powder (1-10 wt%) was prepared, and applied on the mild steel samples, and the corrosion behavior was investigated using electrochemical impedance technique and the method of moist chamber for samples with artificially induced defects. It was found that chemically synthesized polyaniline in the form of emeraldin salts offers the best protection with the optimal concentration of polyaniline about 5 wt.%. The content of phenazine and azane determined by UV-vis spectroscopy in the investigated samples are connected with corrosion protection ability. The proposed mechanism of corrosion protection of mild steel in a real system was also confirmed.
Predmet i naučni cilj rada ove doktorske disertacije je bilo ispitivanje korozionog ponašanja mekog čelika kao najraširenijeg i po ceni veoma prihvatljivog konstrukcionog materijala sa prevlakama na bazi polianilina u različitim korozionim sredinama: korozija u morskoj vodi (3% NaCl), atmosferskoj koroziji i koroziji u zemljištu (Saharski pesak). U prvom delu je ispitivano elektrohemijsko taloženje polianilina galvanostatskom tehnikom na mekom čeliku iy rastvora natrijum-benzoata u cilju određivanje korozionog ponašanja. Takođe, ispitivana je i potencijalna uloga prevlaka polianilina u katodnoj zaštiti mekog čelika, posebno u slučajevima njenog otkazivanja i ustanovljeno je da parcijalna prevlaka polianilina pruža adekvatnu zaštitu od korozije. Pokazano je da delimično naneta prevlaka polianilina ostvaruje dobru zaštitu od korozije čelika u pesku Sahare i od atmosferske korozije Na osnovu ovih ispitivanja, kao model sistema, predložen je mehanizam zamene katodnih i anodnih zona. Po prvi put je otkriveno da i relativno blego osvetljenje (4 mW cm-2) ima uticaja na koroziju čelika prekrivenog polianilinom. Sa obzirom da je elektrohemijski metod sinteze polianilina na mekom čeliku pogodan samo za relativno male predmete, u drugom delu disertacije je ispitivano elektrohemijsko i hemijsko dobijanje prahova polianilina. U tom smislu je određen prinos sinteze, oblik dobijenog polianilina i njegova morfologija. Primenom metoda hemijskog dedopovanja i dopovanja dobijeni su uzorci elektrohemijski odnosno hemijski formiranih prahova u obliku emeraldin soli odnosno emeraldin baze, pošto u literaturi postoje kontraverze koji oblik pruža bolju zaštitu od korozije mekom čeliku. Sa tako dobijenim, okarakterisanim prahovima priprmljene su kompozitna premazna sredstva sa različitim sadržajem prah polianilina (1-10 mas%). Ovakvim premaznim sredstvima su bili zaštićeni uzorci mekog čelika, a koroziono ponašanje je ispitivano primenom elektrohemijske impedansne tehnike i metodom vlažne komore za uzorke sa veštački izazvanim oštećenjima. Ustanovljeno je da hemijski sintetisani polianilin u obliku emeraldin soli pruža najbolju zaštitu pri čemu je optimalna koncentracija polianilina oko 5 mas.%. Primenom UV-vis spektroskopije pokazano je da sadržaj fenazina i anizina u strukturi polianilina određuje kvalitet antikorozione zaštite. Takođe, je potvrđen i predloženi mehanizam zaštite od korozije mekog čelika na realnom sistemu.</abstract><pub>University of Belgrade, Faculty of Technology and Metallurgy</pub><oa>free_for_read</oa></addata></record> |
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| subjects | benzoates benzoati cathodic protection composite coatings corrosion katodna zaštita kompozitne prevlake korozija meki čelik mild steel polianilin polyaniline |
| title | The influence of the polyaniline coatings on corrosion protection of mild steel in different environments |
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