Elektrokemijska ocjena degradiranih industrijskih premaza za zaštitu čeličnih konstrukcija

master's thesis

• Title (english): Electrochemical evaluation of degraded industrial coatings for the protection of steel structures
• Author: David Bakula
• Mentor: Sanja Martinez (mentor)
• Committee member: Sanja Martinez (predsjednik povjerenstva)
• Committee member: Jozefina Katić (član povjerenstva)
• Committee member: Igor Sutlović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-11-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences

Abstract

Kako bi zaštitili metal od vanjskih utjecaja i pojave korozije jedna od metoda na koju se inženjeri pouzdano oslanjaju je upotreba zaštitnih premaza, najčešće organskog podrijetla. Zavisno o uvjetima kojima je metal izložen prilagođavaju se karakteristike premaza, njihov sastav te način pripreme površine metala za odgovarajući zaštitni sustav. U ovom radu okarakteriziran je izgled te ispitana učinkovitost premaza protiv korozije na čeličnim uzorcima koji su izlagani i neizlagani korozivnim uvjetima u primorskoj atmosferi kako bi se usporedila ispitivana svojstva u odnosu na stupanj degradacije. Korišteni sustavi zaštite sastojali su se od primera bogatih cinkom, kombinacije primera i epoksidnog premaza te kombinacije primera, epoksida i poliuretanskog premaza, dok je njihov točan kemijski sastav nepoznat. Provedena je elektrokemijska ocjena uzoraka pomoću elektrokemijskih mjerenja impedancije (EIS metoda), mjerenja svojstava samog premaza (debljina, sjaj i boja) te svojstvo adhezije između premaza i izlaganih uzoraka (pull-off test). Obrađeni rezultati mjerenja ukazuju nam na bolju učinkovitost složenjih i višeslojnih sustava premaza koji pokazuju dobre rezultate na svakom od ispitivanja. Daljnja istraživanja u ovom području trebala bi se temeljiti na optimiziranju sustava višeslojnih organskih premaza kako bi se smanjila debljina potrebna za potpunu zaštitu radi veće ekonomičnosti, ali uz očuvanje kvalitete zaštitnog sustava.

Abstract (english)

In order to protect metal from external influences and corrosion, one of the methods frequently relied upon by engineers is the use of protective coatings, most commonly of organic origin. Depending on which conditions the metal has been exposed to, the characteristics of the coating, such as their composition or the preparation of metal surface, must be adjusted as well. This research contains the characterization of coatings' appearance and testing of coatings' anticorrosion efficiency. Samples have both been exposed and unexposed to corrosive conditions in coastal atmosphere in order to compare the properties in question to the degree of degradation. The used systems of protection contained zinc-rich primers, combination of primers and epoxy coating, and combination of both a primer and epoxy coating with poliurethane coating. Their exact chemical composition remains unknown. The assess of the samples' quality was conducted by electrochemical impendance measurement (EIS method), coating properties measurements (thickness, gloss and color), and the measurement of adhesion between the coating and metal supstrate (pull-off test). The results indicate better efficiency of the more complex and multilayered coating systems that show superior results in every of the measurements. Further research in this area ought to be focused on optimizing multilayered systems of protection in order to decrease the thickness of the coating for economic reasons, all while maintaining the quality of the protective system.

• Keywords: premazi; zaštita metala; korozija; elektrokemijska ocjena uzoraka
• Keywords (english): coatings; metal protection; corrosion; electrochemical evaluation of samples
• Language: croatian
• URN:NBN: urn:nbn:hr:149:814343
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-15 15:38:16