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undergraduate thesis
Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida
završni rad
Split: University of Split, Faculty of Chemistry and Technology, 2018. urn:nbn:hr:167:784029
Kvrgić, Dario
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

Institutional repository: Repository of the Faculty of chemistry and technology

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Kvrgić, D. (2018). Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad (Undergraduate thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:784029

Kvrgić, Dario. "Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:167:784029

Kvrgić, Dario. "Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:167:784029

Kvrgić, D. (2018). 'Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad', Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, accessed 23 November 2024, https://urn.nsk.hr/urn:nbn:hr:167:784029

Kvrgić D. Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad [Undergraduate thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2018 [cited 2024 November 23] Available at: https://urn.nsk.hr/urn:nbn:hr:167:784029

D. Kvrgić, "Usporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad", Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Split, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:167:784029

Metadata
TitleUsporedba korozijskog ponašanja AISI 304, AISI 316L i duplex čelika u otopini klorida : završni rad
Title (english)Comparasion of the corrosion behavior of AISI 304, AISI 316L and duplex steel in chloride solution : bachelor thesis
AuthorDario Kvrgić
MentorSenka Gudić (mentor)
MBZ: 181062
Committee memberLadislav Vrsalović (predsjednik povjerenstva)
Committee memberMario Nikola Mužek (član povjerenstva)
Committee memberSenka Gudić (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2018-09-26, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Korozijsko ponašanje različitih vrsta nehrđajućeg čelika (AISI 304, AISI 316L te duplex čelika) u NaCl otopini ispitano je mjerenjem potencijala otvorenog strujnog kruga te primjenom cikličke i linearne polarizacije. Nakon mjerenja cikličkom polarizacijom površine elektroda snimljene su svjetlosnim mikroskopom. Duplex čelik pokazuje najpozitivniju vrijednost potencijala otvorenog strujnog kruga, najmanju gustoću korozijske struje i najšire područje pasivacije, što ukazuje na njegovu najveću korozijsku otpornost. Također, u usporedbi s drugim ispitivanim uzorcima, duplex čelik ima sposobnost obnavljanja površinskog oksidnog filma. S porastom koncentracije kloridnih iona potencijal depasivacije svih ispitivanih uzoraka čelika postaje negativniji. Nadalje, ukoliko se promjena potencijala u pozitivnom smjeru ostvaruje brže, potencijal depasivacije postaje pozitivniji, što znači da je za pojavu pittinga potrebno izvjesno vrijeme (indukcijsko vrijeme) nakon što se uspostavi stvarni potencijal depasivacije. Potencijal depasivacije i vrijeme nukleacije pitting korozije ispitivanih uzoraka raste redom: AISI 304 < AISI 316L < duplex čelik. Ispitivanjem uzoraka svjetlosnim mikroskopom uočena su oštećenja na površini AISI 304 i AISI 316L dok je površina duplex čelika gotovo neoštećena korozijom.
Abstract (english)
The corrosion behavior of stainless steels (AISI 304, AISI 316L and duplex steel) in NaCl solution was investigated using open circuit potential measurements, cyclic polarization and linear sweep voltammetry measurements. After cyclic polarization measurements electrode surfaces were investigated by light microscope. Duplex steel have the most noble open circuit potential, the lowest corrosion current density and the largest width of the passive region indicates its highest corrosion resistance. Also, compared to other samples, duplex steel shows the possibility of self-healing of oxide film. Increasing the Cl - ion concentration, the depassivation potential becomes more negative for all investigated samples. If the potential scan rate increases depassivation potential becomes more positive, meaning that a certain time (induction time) is needed for the pitting which occurs after the actual depassivation potential is established. Depassivation potential and pitting corrosion nucleation time of investigated samples increase in order: AISI 304 < AISI 316L < duplex steel. Light microscopy investigations of samples reveal pits on the surface of AISI 304 and AISI 316L steel while duplex steel surface is almost clear of any corrosion damage.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:784029
Study programmeTitle: Chemical Technology; specializations in: Chemical Engineering, Environmental Protection
Course: Chemical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Public noteKljučne riječi doradio knjižničar/ Key words are revised by the librarian
Created on2019-01-30 09:17:08