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Title:Priprava zelenih hidrofobnih plasti z antikorozijskimi lastnostmi : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Štiberc, Tjaša (Author)
ID Fuchs-Godec, Regina (Mentor) More about this mentor... New window
ID Bren, Urban (Comentor)
Files:.pdf VS_Stiberc_Tjasa_2024.pdf (2,36 MB)
MD5: A7B756E5003A8C2A95A4A00C8FAEAB22
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Diplomsko delo temelji na preučevanju zelenih inhibitorjev s potencialnimi antikorozijskimi lastnostmi, pri čemer smo se osredotočili na rožmarinov ekstrakt in bučno olje. V ta namen smo pripravili samosestavljive hidrofobne prevleke na kovinskih vzorcih, formirane s potopitvijo v etanolno raztopino 0,05 M stearinske kisline z dodatki različnih koncentracij rožmarinovega ekstrakta in bučnega olja. Določene kovinske vzorce smo predhodno funkcionalizirali z APTES-om in fosfatiranjem, da bi preučili zmožnosti izboljšanja adhezije. Korozijski medij je bila 3,5-odstotna raztopina natrijevega klorida. Učinkovitost hidrofobnih prevlek smo preučili s klasično elektrokemijsko potenciodinamsko metodo. Za podrobno analizo morfologije vzorcev smo uporabili vrstični elektronski mikroskop, poleg tega pa smo uporabili še Fourierjevo transformacijsko infrardečo spektroskopijo (FTIR) in Goniometer OCA25. Rezultati potrjujejo protikorozijsko učinkovitost dodanih inhibitorjev, saj se je inhibicijska učinkovitost z večanjem koncentracije dodatkov rožmarinovega ekstrakta in bučnega olja višala. Najvišjo inhibicijsko učinkovitost 94,16 % smo dosegli v primeru samosestavljive hidrofobne prevleke formirane s potopitvijo kovinskega vzorca v etanolno raztopino 0,05 M stearinske kisline z dodatkom 4% bučnega olja, pri tem da je bila površina vzorca še predhodno funkcionalizirana v 2 % raztopini APTES-a, kar pomeni, da smo s prej omenjenim postopkom uspešno izboljšali oprijem prevleke na kovinskem vzorcu. Visoko inhibicijsko učinkovitost prevleke zagotavlja njena hierarhična struktura, ki smo jo potrdili s proučevanjem morfologije površine s SEM, in vrednostjo kota omočljivosti (>90). Na hidrofobne lastnosti prav tako nakazuje sama sestava raztopine nastanka prevleke (bučno olje in stearinska kislina). S predhodnim fosfatiranjem smo najvišjo vrednost inhibicijske učinkovitosti dosegli pri dodatku 4% bučnega olja (91,765 %). Glede na rezultate lahko sklepamo, da smo s funkcionaliziranjem površine vzorca v 2 % raztopini APTES-a in s fosfatiranjem uspešno izboljšali oprijem prevleke formirane v nadaljevanju postopka s potopitvijo v etanolno raztopino 0,05 M stearinske kisline z dodatkom bučnega olja in rožmarinovim ekstraktom različnih koncentracij.
Keywords:korozija, hidrofobnost, zeleni inhibitorji, potenciodinamska metoda, bučno olje, rožmarin
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[T. Štiberc]
Year of publishing:2024
Number of pages:1 spletni vir (1 datoteka PDF (VIII, 38 f.)
PID:20.500.12556/DKUM-90376 New window
UDC:665.3.038.5(043.2)
COBISS.SI-ID:220285187 New window
Publication date in DKUM:17.09.2024
Views:152
Downloads:63
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:02.09.2024

Secondary language

Language:English
Title:Preparation of green hydrophobic layers with anti-corrosion properties
Abstract:The thesis is based on the study of green inhibitors with potential anti-corrosion properties, focusing on rosemary extract and pumpkin oil. To this end, we prepared self-assembled hydrophobic coatings on metal samples by immersing them in an ethanol solution of 0.05M stearic acid with the addition of various concentrations of rosemary extract and pumpkin oil. Some samples were pre-functionalized with APTES and phosphating to examine the possibilities of improved adhesion. The corrosive medium was a 3.5 % sodium chloride aqueous solution. The effectiveness of the hydrophobic coatings was studied using the classical electrochemical potentiodynamic method. For a detailed analysis of the sample morphology, we applied a scanning electron microscope, Fourier-transform infrared spectroscopy (FTIR), and a Goniometer OCA25. The results confirm the anti-corrosion effectiveness, as the inhibitory efficiency increased with the concentration of added rosemary extract and pumpkin oil. The highest inhibitory efficiency, 94.16 %, was achieved with a self-assembled hydrophobic coating formed by immersing the metal sample in an ethanol solution of 0.05 M stearic acid with the addition of 4 % pumpkin oil, with the sample surface being pre-functionalized with APTES. This indicates that the pre-functionalization successfully improved the adhesion of the coating to the metal sample. The stability of such a coating is also confirmed by the hierarchically structured layers observed in the SEM images and by the contact angle values, which indicate hydrophobic properties dictated by the composition of the coating solution (pumpkin oil and stearic acid). With pre-phosphating, the best inhibitory efficiency was achieved with the addition of 4 % pumpkin oil (91.765 %). Based on the results, we can conclude that APTES and phosphating successfully pre-functionalized the surface and improved the adhesion of the ethanol solution of 0.05 M stearic acid with the addition of pumpkin oil or rosemary extract.
Keywords:corrosion, hydrophobicity, green inhibitors, potentiodynamic method, pumpkin seed oil, rosemary


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