Utjecaj polielektrolita na korozijske kinetičke parametre

master's thesis

• Title (english): Effect of polyelectrolytes on corrosion kinetic parameters
• Author: Marija Jelena Lovrić
• Mentor: Davor Kovačević (mentor)
• Mentor: Damir Hasenay (mentor)
• Committee member: Davor Kovačević (predsjednik povjerenstva)
• Committee member: Jasmina Rokov Plavec (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Committee member: Branimir Bertoša (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U sklopu ovog rada ispitivano je elektrokemijsko ponašanje aluminija u otopinama limunske i
perklorne kiseline pri različitim pH vrijednostima, bez i s dodatkom natrijevog poli(stirensulfonata). Cilj istraživanja je određivanje utjecaja prisutnosti natrijevog poli(stiren-sulfonata)
u otopinama, na kinetičke korozijske parametre. Za određivanje kinetičkih korozijskih
parametara korišena je metoda potenciodinamičke polarizacije. Za karakterizaciju površine
aluminija prije elektrokemijskih mjerenja korištena je metoda mikroskopije atomskih sila.
Određen je utjecaj pH vrijednosti otopina na kinetičke korozijske parametre. S obzirom na
utjecaj pasivnih oksidnih filmova na koroziju aluminija ispitan je utjecaj prisutnosti
polielektrolita na pasivaciju aluminija i potencijalno inhibitorsko djelovanje polielektrolita.
Dokazano je da prisutnost natrijevog poli(stiren-sulfonata) utječe na kinetičke korozijske
parametre. U otopinama s limunskom kiselinom prisutnost polielektrolita ima sinergijski efekt,
pojačava koroziju aluminija te djeluje na stabilnost oksidnog filma na površini metala. U
otopinama s perklornom kiselinom vidljiv je inhibicijski utjecaj, ali i adsorpcija polielektrolita
na površinu aluminija što utječe na stabilnost oksidnog filma.

Abstract (english)

In this thesis, electrochemical behaviour of aluminum in citric and perchloric acid solutions, at
different pH values, with or without added sodium poly(styren sulfonate) was studied. The goal
of the research was determining the impact of presence of sodium poly(styren sulfonate) in
solutions on kinetic corrosion parameters. The potentiodynamic polarization method was used
for that purpose. The atomic force microscopy was used to characterize the aluminum surface
before electrochemical measurements. The influence of solution pH on kinetic corrosion
parameters was determined. Considering the influence of passive oxide films on the corrosion
of aluminum, the influence of the presence of polyelectrolytes on the passivation of aluminum
and the potential inhibitory effect of polyelectrolytes was investigated. The presence of sodium
poly(styrene sulfonate) has been shown to affect kinetic corrosion parameters. In solutions with
citric acid, the presence of polyelectrolytes has a synergistic effect, enhances the corrosion of
aluminum and affects the stability of the oxide film. In solutions with perchloric acid, the
inhibitory effect is visible, but also the adsorption of polyelectrolytes on the aluminum surface,
which affects the stability of the oxide film.

• Keywords: aluminij; korozija; kinetički korozijski parametri; limunska kiselina; polielektroliti; perklorna kiselina
• Keywords (english): aluminum; citric acid; corrosion; kinetic corrosion paramaters; polyelectrolytes; perchloric acid
• Language: croatian
• URN:NBN: urn:nbn:hr:217:651356
• Project: Number: IPS-2020-01-6126; Title: Modulacija polifenolnog profila voća uslijed fizikalnih tretmana nakon branja; Title: Modulation of fruit polyphenolic profile by sustainable postharvest physical treatments; Leader: Davor Kovačević; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IPS
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2024-02-25
• Created on: 2022-03-03 15:30:04