Title
Uticaj prevlaka polianilina na koroziju mekog čelika u različitim sredinama
Creator
Alkais, Ali R. 1970-
Copyright date
2013
Object Links
Select license
Autorstvo-Nekomercijalno 3.0 Srbija (CC BY-NC 3.0)
License description
Dozvoljavate umnožavanje, distribuciju i javno saopštavanje dela, i prerade, ako se navede ime autora na način odredjen od strane autora ili davaoca licence. Ova licenca ne dozvoljava komercijalnu upotrebu dela. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc/3.0/rs/deed.sr_LATN Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc/3.0/rs/legalcode.sr-Latn
Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
Other responsibilities
mentor
Grgur, Branimir, 1965-
član komisije
Gvozdenović, Milica, 1971-
član komisije
Jugović, Branimir
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Beogradu
Faculty
Tehnološko-metalurški fakultet
Alternative title
The influence of the polyaniline coatings on corrosion protection of mild steel in different environments.
Publisher
Beograd : [A. Elkais],
Format
PDF/A (148 listova)
description
Chemistry - Electrochemistry / Хемија - Електрохемија
Datum odbrane: 26.11.2013.
Abstract (sr)
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.
Abstract (sr)
Предмет и научни циљ рада ове докторске дисертације је било испитивање
корозионог понашања меког челика као најраширенијег и по цени веома
прихватљивог конструкционог материјала са превлакама на бази полианилина у
различитим корозионим срединама: корозија у морској води (3% NaCl),
атмосферској корозији и корозији у земљишту (Сахарски песак). У првом делу је
испитивано електрохемијско таложење полианилина галваностатском техником
на меком челику иy раствора натријум-бензоата у циљу одређивање корозионог
понашања. Такође, испитивана је и потенцијална улога превлака полианилина у
катодној заштити меког челика, посебно у случајевима њеног отказивања и
установљено је да парцијална превлака полианилина пружа адекватну заштиту од
корозије. Показано је да делимично нанета превлака полианилина остварује добру
заштиту од корозије челика у песку Сахаре и од атмосферске корозије На основу
ових испитивања, као модел система, предложен је механизам замене катодних и
анодних зона. По први пут је откривено да и релативно блего осветљење (4 mW
cm-2) има утицаја на корозију челика прекривеног полианилином.
Са обзиром да је електрохемијски метод синтезе полианилина на меком
челику погодан само за релативно мале предмете, у другом делу дисертације је
испитивано електрохемијско и хемијско добијање прахова полианилина. У том
смислу је одређен принос синтезе, облик добијеног полианилина и његова
морфологија. Применом метода хемијског дедоповања и доповања добијени су
узорци електрохемијски односно хемијски формираних прахова у облику
емералдин соли односно емералдин базе, пошто у литератури постоје контраверзе
који облик пружа бољу заштиту од корозије меком челику. Са тако добијеним,
окарактерисаним праховима припрмљене су композитна премазна средства са
различитим садржајем прах полианилина (1-10 мас%). Оваквим премазним
средствима су били заштићени узорци меког челика, а корозионо понашање је
испитивано применом електрохемијске импедансне технике и методом влажне
коморе за узорке са вештачки изазваним оштећењима. Установљено је да
хемијски синтетисани полианилин у облику емералдин соли пружа најбољу
заштиту при чему је оптимална концентрација полианилина око 5 мас.%.
Применом УВ-вис спектроскопије показано је да садржај феназина и анизина у
структури полианилина одређује квалитет антикорозионе заштите. Такође, је
потврђен и предложени механизам заштите од корозије меког челика на реалном
систему.
Authors Key words
polyaniline, benzoates, mild steel, corrosion, cathodic protection,
composite coatings
Authors Key words
полианилин, бензоати, меки челик, корозија, катодна заштита,
композитне превлаке
Classification
544.6:620.19(043.3)
Type
Tekst
Abstract (sr)
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.
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