Piezogravimetric investigation of heterocyclic compounds as potential inhibitors against copper corrosion in acidic media

• A. Shaban¹, Gy. Vastag² and L. Nyikos¹

¹ Functional Interfaces Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, H. A. S., 1117 Budapest, Magyar tudósok körútja 2, Hungary
² University of Novi Sad, Faculty of Sciences, Serbia

Abstract: Corrosion and inhibition processes can be followed by different in-situ methods at a nanometer scale. In this contribution, the corrosion breakdown potentials and inhibition efficiencies were evaluated using the electrochemical quartz crystal nanobalance (EQCN) technique, by recording linear potential scan for voltammetric (i–E) and piezogravimetric (m–E) characteristics. The effectiveness of thiazole derivatives, in an aggressive solution of 0.1 M Na2SO4, on the value of the breakdown potential of the copper electrode, was investigated. The investigated thiazole derivatives are: 5-benzylidene-2,4-dioxo tetrahydro-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). The inhibitor effectiveness was monitored and corrosion rates were determined. Previously found effects for some of the thiazole derivatives were confirmed. The most effective, among the tested thiazole derivatives against copper corrosion, was 5-IPBDT, due to the presence of the isopropyl functional group.

Keywords: copper; copper corrosion; corrosion inhibitors; thiazole derivatives; EQCM; corrosion breakdown potential

Int. J. Corros. Scale Inhib., 2015, 4, no. 4, 328-337 PDF (909 K)
doi: 10.17675/2305-6894-2015-4-4-3

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