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

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 Na 2 SO 4 , 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.

SVET study of the interaction of 2-mercaptobenzothiazole corrosion inhibitor with Au, Cu and Au–Cu galvanic pair

“…Despite the widespread study and use of inhibitors, the adsorption configurations and electrochemical processes that lead to corrosion inhibition remain unclear [20][21][22][23][24]. Among the organic compounds used as corrosion inhibitors, those belonging to the azole group are regarded as effective inhibitors [5,12,13,[25][26][27][28][29]. In particular, 2-mercaptobenzothiazole (2MBT) is considered a good corrosion inhibitor for copper [5,14], being the second most efficient inhibitor for copper [30] among the azole family.…”