INHIBITION PROPERTIES OF SOME MIXTURES OF POLYOXYETHYLENE (40) ISO-BUTYL PHENYL ETHER BY THE ADDITION OF HALIDE IONS WITHIN HYDROCHLORIC ACID SOLUTIONS

Namen diplomskega dela je določiti inhibicijsko učinkovitost neionskega tipa PAS Polioksietilen (40) izobutilfenil etra, in sicer na osnovi razlike v masi med zaščitenim in nezaščitenim vzorcem. Zanimalo nas je, kako na inhibicijsko učinkovitost neionskega tipa surfaktanta vplivajo I˗ in Br˗ ioni. Želeli smo doseči čim boljšo protikorozijsko zaščito. Izbrali smo korozivni medij HCl v koncentraciji 15% in mu nadalje v petih različnih koncentracijah dodajali neionski surfaktant Polioksietilen (40) izobutilfenil eter. Koncentracije dodanega inhibitorja so bile naslednje: c = 0,00001 mol L-1, 0,00005 mol L-1, 0,0001 mol L-1, 0,0005 mol L-1 in 0,001 mol L-1. V koncentraciji c = 0,001 mol L-1 smo nato raztopini dodajali tudi halogenidna iona I˗ in Br˗. Z njima smo želeli vplivati na povečanje inhibicijske učinkovitosti kislinsko neobstojnega jekla AISI 304. Korozijsko dogajanje smo preučevali pri sobnih pogojih, v vsaj dveh paralelkah, in sicer v razmaku po petih ali štiriindvajsetih urah potopitve. Glavna Uporabljena metoda dela je bila gravimetrija. Uporabili smo tudi FTIR za analizo adsorbirane plasti in optični mikroskop za opazovanje nastalih sprememb na površini vzorca. Ugotavljamo, da je v primeru večje koncentracije inhibitorja zaščita vzorca boljša. Ugotovili smo tudi, da je inhibicijsko delovanje Polioksietilena (40) izobutilfenil etra v delovanju z I- ioni bolj učinkovito in bolj uspešno inhibira proces korozije v kislem mediju kot v primeru delovanja z Br- ioni pri istih koncentracijah.Propose of the study was to determinate the inhibitory efficiency of non-ionic type PAS Polyoxyethylene (40) isobutylphenyl ether based on the difference in weight between the protected and unprotected pattern. We wanted to know how to inhibitory influence the effectiveness of non-ionic type I- and Br- ions, where by we wanted to achieve the best possible corrosion protection. We have chosen the acidic medium HCl at a concentration of 15%, which was then in five different concentrations added to nonionic curfactant Polyoxyethylene (40) isobutylphenyl ether. Added concentrations of inhibitor were: c= 0,00001 mol L-1, 0,00005 mol L-1, 0,0001 mol L-1, 0,0005 mol L-1 and 0,001 mol L-1. In concentration c=0,001 mol L-1 were added to a solution of a halide ion I-1 and Br-1 with which we wanted to increase the influence on the effectiveness of acid inhibition nondurable steel AISI 304th . Corrosion events were studied at ambient conditions in at least two replicates at intervals of five or twenty-four hours. The main method that was used was gravimetry. We have also used the FTIR for analysis of adsorbed layers and optical microscope to observe the changes on the surface of the sample. We have noticed that in the case of a higher concentration of inhibitor, the protection pattern was better. Also, we have found that inhibiting the operation of polyoxyethylene (40) isobutylphenyl ether in the functioning of I- ions more efficiently and more effectively inhibit the corrosion of the process in an acidic medium than in the case of operation with Br- ions, at the same concentrations