New inhibitors for copper corrosion*
Gy. Vastag1, E. Szöcs2, A. Shaban2, and E. Kálmán2,
1University of Novi Sad, Faculty of Natural Sciences
and Mathematics, Yugoslavia; 2Chemical Research Center, HAS, Bp., H-1525,
P.O. Box 17, Hungary
Abstract: The study of the effectiveness of several potential
copper corrosion inhibitors in acidic media was studied. The investigated
thiazole derivative functional groups contain heterocyclic atoms such
as nitrogen, sulfur, and oxygen. Thiazole derivatives, 5-benzylidene-2,4-dioxotetrahydro-1,3-thiazole
(IPBDT), 5-(3¢-thenylidene)-2,4-dioxotetrahydro-1,3-thiazole (TDT),
(MBDT) were tested for copper corrosion inhibition properties. The electrolyte
solution was 0.1 M Na2SO4.
In situ information on corrosion and inhibition processes can be obtained
using different techniques. Electrochemical measurements (EIS), in situ
scanning probe microscopy (SPM), in addition to quartz crystal microbalance
(QCM) measurements were applied. Those methods are very useful owing
to their high sensitivity and resolution. Dynamic STM and AFM measurements
on Cu(111) single-crystal electrode with and without the addition of
some inhibitors were performed.
The presence of the isopropyl group in the case of IPBDT produced far
better protection against copper corrosion in acidic sulfate-containing
media than the rest of the derivatives.
* An issue of reviews and research papers based on
presentations made at the IUPAC/ICSU Workshop on
Electrochemistry and Interfacial Chemistry in Environmental Clean-up
and Green Chemical Processes, Coimbra, Portugal, 6-7 April, 2001.
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