{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-G6J5CB2D/de9dde22f19-00f494e-1f912861b-8-77c6/PDF","dcterms:extent":"10928 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-G6J5CB2D/3837c4b4-0fc8-46ef-89b8-b7e1e9243d55/TEXT","dcterms:extent":"366 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-G6J5CB2D/01720bde-e92c-4421-8691-979fdfdf6e81/WEB","dcterms:extent":"0 KB"}],"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-G6J5CB2D","dcterms:issued":"2015","dc:contributor":["Fuchs-Godec, Regina","Milošev, Ingrid"],"dc:creator":"Žerjav, Gregor","dc:format":{"@xml:lang":"sl","#text":"XIX, 155 f., 30 cm"},"dc:identifier":["COBISSID:19179030","URN:URN:NBN:SI:doc-G6J5CB2D"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"G. Žerjav"},"dc:source":{"@xml:lang":"sl","#text":"visokošolska dela"},"dc:subject":[{"@xml:lang":"sl","#text":"2-mercaptobenzimidazole"},{"@xml:lang":"sl","#text":"2-merkaptobenzimidazol"},{"@xml:lang":"sl","#text":"Baker"},{"@xml:lang":"sl","#text":"Bakrove zlitine"},{"@xml:lang":"sl","#text":"benzotriazol"},{"@xml:lang":"sl","#text":"benzotriazole"},{"@xml:lang":"sl","#text":"brass"},{"@xml:lang":"sl","#text":"carboxylic acid"},{"@xml:lang":"sl","#text":"cooper"},{"@xml:lang":"sl","#text":"corrosion"},{"@xml:lang":"sl","#text":"Disertacije"},{"@xml:lang":"sl","#text":"inhibitors"},{"@xml:lang":"sl","#text":"karboksilna kislina"},{"@xml:lang":"sl","#text":"Korozija"},{"@xml:lang":"sl","#text":"korozijski inhibitorji"},{"@xml:lang":"sl","#text":"medenina"},{"@xml:lang":"sl","#text":"simulated urban rain"},{"@xml:lang":"sl","#text":"simuliran umetni dež"},{"@xml:lang":"sl","#text":"Zaščita"}],"dc:title":{"@xml:lang":"sl","#text":"Modified surface of Cu, Zn, Cu10Zn and Cu40Zn with expression of hydrophobic properties for the purpose of corrosion protection| doktorska disertacija|"},"dc:description":[{"@xml:lang":"sl","#text":"Copper and its alloys are soft and malleable metals and are often used for fabricating structures and monuments open to the atmosphere where they are subject to corrosion attack. There are many ways to protect metal against corrosion: corrosion inhibitors, protective layers, hydrophobic layers. He aim was to develop a simple technological process for forming hydrophobic, protective coatings for protection of Cu, Cu10Zn, Cu40Zn and Zn under conditions of atmospheric corrosion as tested in simulated urban rain. Carboxylic acids form self-assembled hydrophobic layers by adsorption to the positively charged metal surfaces via their carboxylic group. Corrosion inhibitors are often used to protect metals against corrosion in closed system. Most used corrosion inhibitors to protect Cu and its alloys is benzotriazole (BTAH) which showed good results in different environments. 2-mercaptobenzimidazole (2-MBI) is a derivative of BTAH with stronger affinity to adsorb on the Cu surface and showed good corrosion protection results in acidic solutions. Corrosion protection properties of the layers were tested with the use of electrochemical methods: potentiodynamic polarization and electrochemical impedance spectroscopy. The results were complement with immersion test where the weight loss was obtained. The properties of the layers were explored with surface-analytical methods: measurement of the contact angles, X-ray photoelectron spectroscopy, scanning electron microscopy with a chemical analysis and glow discharge optical emission spectroscopy. First the optimal conditions to produce hydrophobic coatings with the use of carboxylic acids were explored. The inhibition efficiency increased with increasing carbon chain length, longer preparation time in ethanol solution and increasing concentration of carboxylic acid. The inhibition of corrosion of Cu, Cu10Zn, Cu40Zn and Zn in simulated urban rain was further studied using the self-assembly of BTAH, 2-MBI and SA in ethanol solution, as individual inhibitors and in combinations. The morphology of layers differed greatly. The results of electrochemical measurements and weight loss immersion test ruled out BTAH as a possible inhibitor, unless combined with stearic acid. In the cases of Cu40Zn and Zn it even promoted corrosion. In contrast, 2-MBI gave good results, and even better in combination with stearic acid. SA layers provided the best long term corrosion protection of all tested inhibitors and exhibited the highest contact angles. 2-MBI provided less protection than SA. Combining organic inhibitor and stearic acid improves the corrosion protection properties of the self-assembled layers compare to individual layers. To make the procedure of layer preparation more appropriate for industrial application the time of immersion was decreased. Layers prepared on Cu with 1 min immersion time showed adequate corrosion protection of Cu in simulated urban rain. We also studied the possibility of combining SA with vitamin E in the layer preparation procedure. The modified layers formed with combination of Vitamin E and SA showed better corrosion inhibition properties for Cu and Cu40Zn in simulated urban rain as individual layers. Combining inhibitor and carboxylic acid together to prepare corrosion protective layers has a positive effect on the corrosion properties of the layers. Layers made combining corrosion inhibitor and carboxylic acid showed better corrosion protection than individual layers. The self-assembling process is a fast process shown by the tests made on the Cu layers with shorter immersion time. The addition of Vitamin E in the preparation of layers with carboxylic acids shows a positive effect on the corrosion properties of layers"},{"@xml:lang":"sl","#text":"Cu, Zn in medenine tako kot vse kovine in njihove zlitine korodirajo. Za protikorozijsko zaščito bakra in njegovih zlitin se uporablja več metod: zaščitne plasti, korozijski inhibitorji, hidrofobne prevleke,... Karboksilne kisline se s pomočjo karboksilne skupine povežejo s pozitivno nabito površino kovine in tako tvorijo hidrofobno prevleko. Uporaba organskih inhibitorjev je zelo razširjena metoda za zaščito bakra in njegovih zlitin v zaprtih sistemih. Med najbolj razširjenimi inhibitorji Cu sta benzotriazol (BTAH) in 2-merkaptobenimidazol (2-MBI). Namen doktorske disertacije je bil raziskati možnosti uporabe karboksilnih kislin in inhibitorjev za protikorozijsko zaščito Cu, Zn in medenin Cu10Zn in Cu40Zn v raztopini umetnega dežja. Protikorozijske lastnosti prevlek sem testiral z elektrokemijskima metodama: potenciodinamska polarizacija in elektrokemijska impedančna spektroskopija. Rezultate elektrokemijskih meritev sem dopolnil s potopitvenim testom, kjer sem meril izgubo mase. Površino pripravljenih prevlek sem karakteriziral s pomočjo 3-D profilometra, rentgenske fotoelektronske spektroskopije, z uporabo vrstičnega elektronskega mikroskopa s kemijsko analizo, z uporabo razelektritvene optične spektroskopije in merjenjem kontaktnih kotov. Hidrofobne plasti na površini kovin oz. zlitin sem pripravil s postopkom potapljanja v etanolno raztopino karboksilne kisline, kjer sem testiral spremembe različnih dejavnikov na inhibicijsko učinkovitost. Zaključim lahko, da je protikorozijska zaščita prevlek naraščala z dolžino ogljikove verige karboksilnih kislin, z daljšim časom potopitve vzorcev v etanolni raztopini in z višanjem koncentracije karboksilnih kislin v etanolni raztopini. Preizkusil sem protikorozijske lastnosti prevlek pripravljenih na Cu, Cu10Zn, Cu40Zn in Zn v raztopini umetnega dežja samo z uporabo SA, BTAH ali 2-MBI (individualne prevleke) ter z kombiniranjem le teh. Morfologije prevlek so se zelo razlikovale med seboj. Rezultati elektrokemijskih meritev in potopitvenih testov so izločili prevleko narejeno le iz BTAH kot učinkovito protikorozijsko zaščito Cu. V primeru Cu40Zn in Zn je celo pospešila korozijo. Drugačna slika se je pokazala z kombinacijo SA. Testi so pokazali, da je prevleka pripravljena z 2-MBI pokazal boljše rezultate kakor BTAH prevleka, in še boljše v kombinaciji s SA. Rezultati testov so pokazali, da se je med individualnimi prevlekami najboljša izkazala prevleka narejena iz SA, ki je pokazala najboljše dolgoročne protikorozijske lastnosti in najvišjo hidrofobnost. Testiral sem tudi prevleke pripravljene z kombinacijo SA in BTAH ali 2-MBI. Rezultati meritve so tudi v tem primeru pokazali, da so protikorozijske lastnosti boljše kakor v primeru uporabe samo SA, BTAH ali 2-MBI. Rezultati elektrokemijskih meritev na Cu so pokazali, da lahko postopek priprave prevlek še poenostavimo in skrajšamo čas potopitve v etanolni raztopini na 1 min, saj so bili rezultati testiranja protikorozijske zaščite Cu zadovoljivi tudi z krajšim potopitvenim časom. Testiral sem tudi vpliv dodajanja Vitamina E v etanolno raztopino SA pri pripravi prevleke na Cu in Cu40Zn. Rezultati elektrokemijskih meritev so pokazali, da dodajanje Vitamina E izboljša protikorozijske lastnosti prevleke, kako uporaba samo SA ali Vitamina E. Zaključim lahko, da kombiniranje korozijskega inhibitorja in karboksilne kisline pri pripravi prevleke pozitivno vplivala na protikorozijske lastnosti prevleke. Prevleke narejenen s kombiniranjem korozijskega inhibitorja in karboksilne kisline so pokazale boljšo dolgoročno protikorozijsko zaščito kakor prevleke narejene samo s inhibitorjem ali karboksilno kislino. Tvorjenje prevlek je hiter postopek, kar so pokazali testi narejeni na Cu s prevlekami pri katerih je bil čas potopitve skrajšan na 1 minuto. Dodajanje Vitamin E pri pripravi prevlek s karboksilnimi kislinami prav tako kaže pozitiven vpliv na protikorozijske lastnosti prevlek"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"visokošolska dela"},{"@xml:lang":"en","#text":"theses and dissertations"},{"@rdf:resource":"http://www.wikidata.org/entity/Q1266946"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-G6J5CB2D","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-G6J5CB2D"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-G6J5CB2D/de9dde22f19-00f494e-1f912861b-8-77c6/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Mariboru, Fakulteta za kemijo in kemijsko tehnologijo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-G6J5CB2D/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-G6J5CB2D"}}}}