Study of inhibition properties of some thiazole derivatives against copper corrosion

Abstract

The inhibitor efficiency of some thiazole derivatives against copper corrosion in acidic sulfate solutionwere 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 thecathodic reaction rate on copper electrode surface in 0.1 mol dm–3 acidic Na2SO4 solution. Ininvestigation range concentration 0.01mmoldm-3 has the best inhibitor efficiency in case of allinvestigated thiazole. The best protection is obtained in presence of 5-IPBDT derivatives. EIS resultsshowed that investigated thiazole derivatives formed a film on copper surface which was able toprotect copper against corrosion in acidic media. 5-IPBDT derivative only formed closely packedinhibitor film, which is able to protect copper surface during the time.