Komercialna kurkuma kot inhibitor korozijskih procesov

diplomsko delo univerzitetnega študijskega programa I. stopnje

Eva Patik (Author), Regina Fuchs-Godec (Mentor), Urban Bren (Co-mentor)

Abstract

Korozija predstavlja enega izmed pomembnih globalnih problemov. Z uporabo korozijskih inhibitorjev lahko upočasnimo raztapljanje kovinskih materialov v agresivnih medijih, in sicer so najbolj zaželeni zeleni inhibitorji, saj nimajo negativnih vplivov na okolje. Glavna komponenta kurkume je kurkumin, ki zaradi antioksidativnih lastnosti sodi med potencialne zelene inhibitorje korozijskih procesov. Namen diplomskega dela je ugotoviti, ali kurkuma zagotavlja učinkovito protikorozijsko zaščito v 3,5-odstotni raztopini NaCl in kako je ta odvisna od koncentracije dodanega inhibitorja (komercialne kurkume). Zaščitne prevleke so bile narejene s potopitvijo vzorca aluminijaste pločevine v etanolno ali metanolno raztopino oktadekanojske kisline z dodatkom komercialne kurkume v različnih koncentracijah. V ta namen smo uporabili klasično potenciodinamsko metodo. Na osnovi klasičnih korozijskih parametrov (gostota korozijskega toka in polarizacijska upornost) smo izračunali korozijsko hitrost in inhibicijsko učinkovitost. Za določitev morfologije zaščitnega sloja je bil uporabljen elektronski mikroskop SEM, na osnovi omočitvenega kota pa smo določili, ali je ta samosestavljiva plast hidrofilna ali hidrofobna. Z ATR-FTIR-spektroskopijo smo analizirali sestavo zaščitne prevleke, kar pomeni prisotnost funkcionalnih skupin v nastalem sloju na površini kovinskega vzorca. Prav tako smo s to metodo analizirali tudi samo raztopino, v katero so bili kovinski vzorci potopljeni. Meritve kontaktnega kota dokazujejo, da imajo tako pripravljene samosestavljive prevleke hidrofobne lastnosti, katerih vrednosti inhibicijske učinkovitosti presegajo vrednost 80 %.

Keywords

korozija;aluminij;zeleni korozijski inhibitor;kurkuma;potenciodinamska metoda;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[E. Patik]
UDC:	620.197.3:547.979.4(043.2)
COBISS:	166684419
Views:	38
Downloads:	6
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Commercial turmeric as an inhibitor of corrosion processes
Secondary abstract:	Corrosion is one of the biggest global problems. Corrosion inhibitors can be used to slow the dissolution of metal samples in aggressive media, and green inhibitors are the most desirable because they have no negative impact on the environment. The main component of turmeric is curcumin, which is one of potential green inhibitors of corrosion processes due to its antioxidant properties. The purpose of this work is to investigate whether turmeric in a 3.5% NaCl solution provides effective corrosion protection and how this depends on the concentration of the added inhibitor (commercial turmeric). Protective coatings were prepared by immersing an aluminium sample in ethanol or methanol solutions of octadecanoic acid with the addition of commercial turmeric at different concentrations. For this purpose, we applied the classical potentiodynamic method. Based on the typical corrosion parameters (corrosion current density and polarisation resistance), the corrosion rate and inhibition effect were calculated. The SEM electron microscope was used to determine the morphology of the protective layer, and the contact angle was applied to determine whether the corresponding self-assembling layer was hydrophilic or hydrophobic. ATR-FTIR spectroscopy was used to analyse the composition of the protective layer, i.e., the presence of functional groups in the formed layer on the surface of the metal sample. Moreover, the solution in which the metal samples were immersed was also analysed by this method. The contact angle measurements show that the self-assembled coatings prepared in this way exhibit hydrophobic properties with a corrosion inhibition effect of over 80%.
Secondary keywords:	corrosion;aluminium;green corrosion inhibitor;turmeric;potentiodynamic method;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo, Kemija
Pages:	1 spletni vir (1 datoteka PDF (VIII, 35 f.))
ID:	19839895