prikaz prve stranice dokumenta Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta
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undergraduate thesis
Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta
završni rad
Split: University of Split, Faculty of Chemistry and Technology, 2019. urn:nbn:hr:167:986426
Hrepić, Antea
University of Split
Faculty of Chemistry and Technology
Library

Cite this document

Hrepić, A. (2019). Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad (Undergraduate thesis). Split: University of Split, Faculty of Chemistry and Technology, Library. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:986426

Hrepić, Antea. "Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Library, 2019. https://urn.nsk.hr/urn:nbn:hr:167:986426

Hrepić, Antea. "Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Library, 2019. https://urn.nsk.hr/urn:nbn:hr:167:986426

Hrepić, A. (2019). 'Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad', Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Library, accessed 20 April 2024, https://urn.nsk.hr/urn:nbn:hr:167:986426

Hrepić A. Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad [Undergraduate thesis]. Split: University of Split, Faculty of Chemistry and Technology, Library; 2019 [cited 2024 April 20] Available at: https://urn.nsk.hr/urn:nbn:hr:167:986426

A. Hrepić, "Inhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad", Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Library, Split, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:167:986426

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Metadata
TitleInhibicija korozije metala uporabom Padina pavonica (Linnaeus) Thivy ekstrakta : završni rad
Title (english)Corrosion inhibition of some metals by Padina pavonica (Linnaeus) Thivy extract : bachelor thesis
AuthorAntea Hrepić
MentorIvana Smoljko (mentor)
MBZ: 267183
Committee memberNenad Kuzmanić (predsjednik povjerenstva)
Committee memberLadislav Vrsalović (član povjerenstva)
Committee memberIvana Smoljko (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
Library
Split
Defense date and country2019-09-09, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Zbog široke primjene konstrukcijskih materijala neminovno je djelovanje različitih vanjskih utjecaja koja uzrokuju oštećenja. Najznačajni proces odgovoran za ista je korozija pa se, kako bi se spriječila, podliježe metodama zaštite, prvenstveno upotrebom inhibitora. Zeleni inhibitori dobivaju sve više pozornosti jer većina dobivena iz prirodnih proizvoda djeluje antikorozivno, a ujedno su ekološki prihvatljivi i bezopasni te djeluju već pri niskim koncentracijama. Biljni ekstrakti smatraju se bogatim, prirodno sintetiziranim kemijskim spojevima. U ovom završnom radu ispitano je djelovanje vodenog ekstrakta smeđe alge Padina pavonica, u volumnim koncentracijama 0,2 % te 0,8 %, na inhibiciju korozije bakra, AISI 304 nehrđajućeg čelika te aluminija tehničke čistoće u 0,5 mol dm –3 otopini NaCl. Izvršena je ekstrakcija fenolnih spojeva u ultrazvučnoj kupelji te je sadržaj ukupnih fenola određen spektrofotometrijski. Daljnja su ispitivanja provedena elektrokemijskim metodama (metodom mjerenja potencijala otvorenog kruga, metodom linearne polarizacije i potenciodinamičkom polarizacijskom metodom), dok je površina ispitivanih materijala analizirana optičkim mikroskopom pri različitim uvećanjima. Na temelju dobivenih rezultata elektrokemijskih mjerenja, moguće je vodeni ekstrakt P. pavonica klasificirati kao djelotvorni inhibitor korozije u vodenoj otopini soli za sve ispitane metale, a prvenstveno za aluminij. Djelotvornost inhibicije raste s porastom koncentracije ekstrakta u otopini pa se tako 0,8 %-tni ekstarakt pokazao kao najbolji inhibitor korozijskog djelovanja.
Abstract (english)
Wide usage of construction materials in modern world means that such materials are exposed to various external influences that result in damage of the material. Most important process responsible for such damage is corrosion. As a mean to prevent those damages, materials are introduced to methods of protection, most often by using inhibitors. Green inhibitors are attracting more and more attention since majority of them are anti-corrosive and are produced from natural sources, while at the same time are ecologically sustainable and harmless and are effective even in small concentrations. Herbal extracts are considered to be rich with naturally synthesized chemical compounds. This bachelor thesis aims to study the inhibition effect of aquaeous extract of brown algae Padina pavonica (in 0.2% and 0.8% (v/v) concentration) on corrosion of copper, AISI 304 stainless steel and technical aluminium in the 0.5 mol dm –3 NaCl solution. Total phenolic compounds were isolated by ultrasound assisted extraction and were determined spectrofotometrically. Following experiments were conducted using electrochemical techniques (linear polarization and potentiodynamic polarization technique). Surface of the samples was analyzed using optical microscope with various enlargements. The collected experimental results revealed that aqueous extract of P. pavonica can be classified as an effective corrosion inhibitor in saline solution for all of the tested metals, especially for aluminium. The inhibition efficiency increased with increasing extract concentration, thus 0.8% extract proved to be the best corrosion inhibitor.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:986426
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
Embargo expiration date: 2021-09-10
Terms of useLicence In copyright icon
Public noteKljučne riječi doradio knjižničar/ Key words are revised by the librarian
RepositoryRepository of the Faculty of chemistry and technology
Created on2019-09-23 11:04:21