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2012, vol. 53, br. 1, str. 29-32
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Ispitivanje inhibitorskih svojstva derivata tiazola na koroziju bakra
Study of inhibition properties of some thiazole derivatives against copper corrosion
aUniverzitet u Novom Sadu, Prirodno-matematički fakultet
bHAS, Chemical Research Center, Budapest, Hungary
Sažetak
Ispitivana je inhibitorska efikasnost odabranih derivata tiazola u odnosu na koroziju bakra u kiseloj sredini snimanjem polarizacionih krivi i impedansnim merenjima. Određivana je zaštitna sposobnost sledećih organskim molekula: 5-benziliden-2,4-dioksotetrahidro-1,3-tiazol (5-BDT), 5-(4'-izopropilbenziliden)- 2,4-dioksotetrahidro-1,3-tiazol (5-IPBDT), 5-(3'-teniliden)-2,4-dioksotetrahidro-1,3-tiazol (5-TDT) i 5-(3',4'-dimetoksibenziliden)-2,4-dioksotetrahidro-1,3-tiazol (5-MBDT) u 0,1mol/dm-3 rastvoru Na2SO4 pri pH=2,95. Polarizaciona merenja ukazuju da svi ispitivani derivati tiazola smanjuju brzinu redukcije kiseonika, delujući kao katodni inhibitori korozije bakra kiselom u 0,1mol dm-3 rastvoru Na2SO4. U ispitivanom opsegu, koncentracija od 0,01 mmoldm-3 ima najveću inhibitorsku efikasnost kod svih ispitivanih derivata. Najbolja zaštita uočena je kod 5-IPBDT derivata. Merenja impedanse pokazuju da ispitivana jedinjenja formiraju film na površini bakarne elektrode koji je sposoban da štiti bakar od korozije u kiseloj sredini. 5-IPBDT derivat jedino formira dovoljno kompaktan film, koji može da štiti bakar od korozije u dužem vremenskom periodu.
Abstract
The inhibitor efficiency of some thiazole derivatives against copper corrosion in acidic sulfate solution were investigated using polarization and electrochemical impedance spectroscopy (EIS) methods. Protection efficiency of four organic molecules: 5-benzylidene-2,4-dioxotetrahydro-1,3-thiazole (5-BDT), 5-(4'-isopropylbenzylidene)-2,4-dioxotetrahydro-1,3-thiazole (5-IPBDT), 5-(3'-thenylidene)- 2,4-dioxotetrahydro-1,3-thiazole (5-TDT) and 5-(3',4'-dimetoxybenzylidene)-2,4-dioxotetrahydro-1,3-thiazole (5-MBDT) were investigated on copper electrode in 0.1moldm-3 Na2SO4 solution at pH=2.95. Polarization measurements indicates that all investigated thiazole derivatives could reduces the cathodic reaction rate on copper electrode surface in 0.1 mol dm-3 acidic Na2SO4 solution. In investigation range concentration 0.01mmoldm-3 has the best inhibitor efficiency in case of all investigated thiazole. The best protection is obtained in presence of 5-IPBDT derivatives. EIS results showed that investigated thiazole derivatives formed a film on copper surface which was able to protect copper against corrosion in acidic media. 5-IPBDT derivative only formed closely packed inhibitor film, which is able to protect copper surface during the time.
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