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Title:Inhibicijska učinkovitost mešanic neionske-ionske površinsko aktivne snovi v agresivnem mediju
Authors:ID Jezernik, Klara (Author)
ID Fuchs Godec, Regina (Mentor) More about this mentor... New window
ID Finšgar, Matjaž (Comentor)
Files:.pdf UN_Jezernik_Klara_2017.pdf (2,37 MB)
MD5: C9B8EA3D7DB2FBF688C9C8C87C38AEAC
PID: 20.500.12556/dkum/d179f0e7-c168-489b-9294-730434cd9ff9
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V okviru diplomskega dela smo želeli ugotoviti, kako delujejo mešanice površinsko aktivnih snovi v agresivnem kislem mediju. Pri tem so mešanice površinsko aktivnih snovi delovale kot kislinski inhibitorji. Ker nas je zanimalo, kako vplivajo koncentracije inhibitorjev v mešanicah, smo spreminjali njihova razmerja v raztopinah agresivnega medija. Vsaka mešanica inhibitorjev je vsebovala neionsko površinsko aktivno snov (oktil fenol etoksilat) in površinsko aktivno snov ionskega tipa (HTAB ali SDS). Poskuse smo izvedli na vzorcih nerjavnega jekla, katere smo predhodno ustrezno pripravili. Pri eksperimentalnem delu smo uporabili gravimetrično analizo, ki je zajemala tehtanje vzorcev pred in po izpostavitvi neinhibirani ali inhibirani raztopini agresivnega medija. Na nekaterih vzorcih so bile poškodbe, nastale po izpostavitvi neinhibirani ali inhibirani raztopini agresivnega medija dobro vidne, druge manj, zato smo njihovo površino analizirali tudi pod mikroskopom. Za potrditev adsorpcije in tvorbo zaščitnega sloja na površini vzorcev smo uporabili infrardečo spektroskopijo s Fourierjevo transformacijo na oslabljeni totalni odboj (ATR-FTIR). Mešanice neionske-kationske površinsko aktivne snovi so bile učinkovitejše v smislu inhibicije kot mešanice neionske-anionske površinsko aktivne snovi. Inhibicijska učinkovitost mešanic PAS je naraščala z višanjem koncentracije neionskega inhibitorja. Rezultati potrjujejo, da so lahko mešanice površinsko aktivnih snovi bolj učinkovite kot samostojni inhibitorji, vendar je učinkovitost odvisna od narave preiskovanega sistema.
Keywords:mešanice površinsko aktivnih snovi, korozija, inhibicija korozije, korozijska hitrost, sinergistični parameter
Place of publishing:Maribor
Publisher:[K. Jezernik]
Year of publishing:2017
PID:20.500.12556/DKUM-67490 New window
UDC:620.1/.2:542.942'78(043.2)
COBISS.SI-ID:21034006 New window
NUK URN:URN:SI:UM:DK:IXBABECI
Publication date in DKUM:14.09.2017
Views:2180
Downloads:207
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nd/4.0/
Description:Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:21.08.2017

Secondary language

Language:English
Title:Inhibition efficiency of mixtures of nonionic-ionic surface active agents within aggressive media
Abstract:This undergraduate thesis presents the corrosion inhibition study of mixtures containing surface active agents in aggressive acidic solvents. The main focus of this thesis was the study of the concentration influence of surface active agents in the mixtures on corrosion inhibition effectiveness. Each mixture contained one non-ionic inhibitor (octylphenol ethoxylate) and one ionic inhibitor (HTAB or SDS). The experiments were carried out on stainless steel samples which were prepared beforehand. The change of mass of the samples was measured before and after the corrosion test. Some of the samples were visibly damaged by the acid. Further investigations of the damage caused by corrosion were made by microscope. Afterwards, the samples were characterised with ATR-FTIR-spectroscopy. The results showed that we have successfully inhibited the samples by adding mixtures of surface active agents to the aggressive acidic solvents. The nonionic-cationic mixture of surfactants inhibited the samples more efficiently than the nonionic-anionic surfactants. The mixtures which had higher concentrations of nonionic surface active agent were more effective than those with lower concentrations. The obtained results proved that the surface active agent mixtures can be more effective than the surface active agents alone. However, the efficiency of the agents depends on their properties.
Keywords:mixtures of surface active agents, corrosion, corrosion inhibition, corrosion rate, synergistic parameter


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