Vpliv Br in I ionov na inhibicijsko učinkovitost neionskega tipa PAS v kislem mediju

diplomsko delo univerzitetnega študijskega programa I. stopnje

Sabina Jurak (Author), Regina Fuchs-Godec (Mentor), Matjaž Finšgar (Co-mentor)

Abstract

Namen diplomskega dela je bil raziskati vpliv mešanice neionskega surfaktanta oktilfenol etilenoksida (inhibitor) z in brez dodatka 1 mM KBr ali 1 mM KI v vodni raztopini 15 - odstotne HCl na inhibicijo korozije kislinsko neodpornega jekla AISI 304. V nalogi smo potemtakem proučevali inhibicijske lastnosti neionskega surfaktanta v močno agresivnem mediju kadar je v vlogi korozijskega inhibitorja sam in kakšen je odziv kadar so v raztopino dodani še halogenidni ioni. Kot korodirni medij smo uporabili mešanice 15% HCl + x M oktilfenol etilenoksid, v nadaljevanju še mešanice 15% HCl + x M oktilfenol etilenoksid + 1mM KBr, ter mešanice 15% HCl + x M oktilfenol etilenoksid + 1mM KI. Koncentracije oktilfenol etilenoksida so bile naslednje: c = (10˗3, 5∙10˗4, 10˗4, 5∙10˗4, 10˗5) mol L-1. Eksperimente smo izvajali pri sobni temperaturi in normalnem zračnem tlaku v dveh časovnih potopitvenih intervalih (5 in 24 ur). S pomočjo gravimetrične metode smo določali izgubo mase jeklenih vzorčkov. Spremembe na površini vzorca smo spremljali z optičnim mikroskopom. Za določanje/analizo prisotnosti pričakovanih funkcionalnih skupin na površini kovinskega vzorca smo Fourierjevo transformacijsko infrardečo spektroskopijo – FTIR Dobljeni rezultati nakazujejo, da je inhibicijska učinkovitost ob dodatku halogenidnih ionov veliko boljša. Dodatek bromidnih ionov poveča inhibicijsko učinkovitost predvsem pri nizkih koncentracijah. Višjo inhibicijsko učinkovitost smo dosegli z dodatkom jodidnih ionov. Pri koncentraciji c = 10˗3 mol L-1 po 24 urah je bila le-ta celo do 97 % in več. Na osnovi dobljenih rezultatov lahko trdimo, da dlje časa kot je vzorec potopljen v korozivni medij, večja je adsorpcija na kovino. Potrdimo lahko tudi, da učinkovitost inhibitorja s koncentracijo narašča.

Keywords

oktilfenol etilenoksid;halogenidni ioni;inhibicijska učinkovitost;korodirni mediji;gravimetrična metoda;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2016
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[S. Jurak]
UDC:	661.185.4(043.2)
COBISS:	20310806
Views:	896
Downloads:	65
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	THE EFFECT OF Br AND I IONS ON THE INHIBITION EFFICIENCY OF THE NON-IONIC TYPE OF SAA WITHIN ACIDIC MEDIUM
Secondary abstract:	The purpose of the study was to investigate the effect of a mixture of nonionic surfactant octylphenol ethylene oxide (inhibitor) with and without the addition of 1 mM KBr or 1 mM KI in the aqueous solution 15 - percentage of HCL on the inhibition of corrosion of acid non-resistant steel AISI 304. In this dissertation we have studied thus inhibiting properties of nonionic surfactant in highly aggressive medium when it is in the role of corrosion inhibitor itself and what the response is when are added the halide ions in the solution. As corroding medium, we used a mixture of 15 % HCl + x M octylphenol ethylene oxide, thereafter, the mixture of 15 % HCl + x M octylphenol ethylene + 1 mM KBr, and the mixtures of 15 % HCl + x M octylphenol ethylene + 1 mM KI. Concentrations of octylphenol ethylene oxide were as follows: c = (10˗3, 5∙10˗4, 10˗4, 5∙10˗4, 10˗5) mol L-1. Experiments were carried out at room temperature and normal pressure in the two time immersive intervals (5 and 24 hours). By using the gravimetric method, we determined the loss of mass of steel samples. Changes on the surface of the sample were checked with an optical microscope. For the determination/analysis presence of the expected functional groups on the surface of the metal sample was used the Fourier transform infrared spectroscopy - FTIR The results indicate that the inhibitory efficacy is much better when halide ions are added. Bromide ion increases the inhibitory efficiency especially at low concentrations. Even greater inhibition efficiency was achieved by the addition of iodide ions. At the concentration of c = 10˗3 mol L-1, after 24 hours, the latter raised up to 97% and more. Basedon the results we can say, that the longer the sample is being immersed in a corrosive medium, the greater the adsorption on metal is. We can as well confirm that the effectiveness of the inhibitor increases with the concentration.
Secondary keywords:	octylphenol ethylene oxide;halide ions;inhibition efficiency;corroding medium;gravimetric method;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	X, 34 str.
ID:	9164872