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Title:Ekstrakt rožmarina, kot inhibitor korozijskih procesov
Authors:ID Romanić, Luka (Author)
ID Fuchs Godec, Regina (Mentor) More about this mentor... New window
ID Bren, Urban (Comentor)
Files:.pdf UN_Romanic_Luka_2016.pdf (6,01 MB)
MD5: 52DEAEE251E63B1D5427A05428B66327
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu smo preučili uporabo okolju prijaznega inhibitorja za protikorozijsko zaščito. Natančneje smo raziskali vpliv različnih koncentracij rožmarinovega ekstrakta v prahu, kot zelenega inhibitorja za korozijske procese in princip njegovega delovanja. Uporabljeni so bili vzorci nerjavnega jekla, ki smo jih pred potopitvijo v korodirni medij primerno obdelali. Površino kovine smo skrbno zbrusili z vodo brusnim papirjem različnih granulacij, jedkali, razmastili in očistili s pomočjo ultrazvočne kopeli. Kot korodirni medij smo uporabili močno koncentrirano vodno raztopino klorovodikove kisline. S potopitvami predhodno obdelanih vzorcev v osnovni korodirni medij smo z in brez dodatka rožmarinovega ekstrakta na osnovi gravimetrične metode izračunali korozijsko hitrost in inhibicijsko učinkovitost zelenega inhibitorja. Za lažjo obdelavo podatkov smo vse meritve spremembe mase pri potopitvah opravili pri sobni temperaturi in jih spremljali v različnih časovnih intervalih od 3, 5, 18 do 24 ur. Po opravljenih meritvah in izračunih smo s pomočjo mikroskopa ter infrardeče spektroskopije preučili videz, kot tudi sestavo adsorbiranega sloja na površini jekla. Uspešno smo zaščitili vzorce in upočasnili korozijsko hitrost. Dosegli smo celo več kot 98 % inhibicijsko učinkovitost, pri čemer smo ugotovili, da se ta z večanjem koncentracije inhibitorja veča. Glede na dobljene rezultate lahko trdimo, da je ekstrakt rožmarina dober inhibitor korozijskih procesov za nerjavno jeklo AISI 304 v kislem okolju medija razredčene klorovodikove kisline. Za potrditev hidrofobnega značaja nastalega filma na površini, bi bilo potrebno opraviti še meritve kontaktnega kota. Vsekakor pa so priporočene še podrobnejše raziskave, s katerimi bi bolje razumeli vpliv številnih drugih dejavnikov na afiniteto adsorpcije ter posledično na povečanje inhibicije.
Keywords:rožmarinov ekstrakt, korozija, nerjavno jeklo, gravimetrična metoda, učinkovitost inhibitorjev, spektrometrične analize
Place of publishing:Maribor
Publisher:[L. Romanić]
Year of publishing:2016
PID:20.500.12556/DKUM-62840 New window
UDC:602.197.3:633.812(043.2)
COBISS.SI-ID:20314902 New window
NUK URN:URN:SI:UM:DK:S7DN1ROT
Publication date in DKUM:08.09.2016
Views:2105
Downloads:185
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:Extract of rosemary, as an inhibitor of the corrosion processes
Abstract:In this thesis, we investigated the use of environmentally friendly inhibitor for corrosion protection. More specifically, we examined the effect of different concentrations of rosemary extract in powder, as a green inhibitor in corrosion processes and the principle of its operation. We used samples from stainless steel, which were properly treated before immersion in corrosive medium. The metal surface has been carefully sanded with water sandpaper of different grits, followed by etching, degreasing and cleaning in an ultrasonic bath. For corrosive medium, we used a highly concentrated water-based solution of hydrochloric acid. By immersing the pretreated samples in primary corrosive medium, with and without the addition of rosemary extract, we calculated on the basis of gravimetric method the rate of corrosion and inhibition efficiency of the green inhibitor. In order to facilitate the processing of the data all the measurements of weight change by immersion were performed at room temperature and monitored at various time intervals of 3, 5, 18 to 24 hours. After measurements and calculations, we studied the appearance as well as the structure of the adsorbed layer on the steel surface with the help of a microscope and infrared spectroscopy. We successfully protected the samples and lowered the corrosion rate. We achieved more than 98 % of inhibition efficiency, and found out that it increases with inhibitor concentration. According to the results we can say that the rosemary extract is a good inhibitor of corrosion processes for AISI type 304 stainless steel in an acidic environment of dilute hydrochloric acid medium. To confirm the hydrophobic character of the resulting film on the surface, it would be necessary to make measurements of the contact angle. However, further research would be needed to better understand the impact of a variety of other factors on the affinity of adsorption, and therefore on the increase in the inhibition.
Keywords:rosemary extract, corrosion, stainless steel, gravimetric method, inhibition efficiency, spectrometric analysis


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