SYNTHESIS, CHARACTERISATION AND CORROSION INHIBITION SCREENING OF Co(II) DITHIOCARBAMATE COMPLEXES IN HCl AND H2SO4
Keywords:
acid, corrosion inhibitor, dithiocarbamate, mild steelAbstract
Most industries use acids during cleaning processes where they may cause severe corrosion attacks on
metal surfaces. This study utilised a corrosion inhibitor to reduce the corrosion rate. Cobalt(II) N
methylcyclohexylamine dithiocarbamate, Co[MeCycHexdtc]2 and cobalt(II) N-ethylcyclohexylamine
dithiocarbamate, Co[EtCycHexdtc]2 were synthesised by using the in-situ method with a molar ratio of
2:2:1 (carbon disulphide:amine:metal salt) in cold ethanolic solution and characterised by using the
Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR) and Ultraviolet-Visible (UV-Vis)
spectroscopies. In the FTIR-ATR analysis, the presence of dithiocarbamate moiety was proven by the
data shown with the presence of a new specific stretching bands, thioureide band, υ(C
in the range of 1478–1481 cm-1 and υ(C
N) which is found
S) in 1010-1012 cm-1 of the spectra in both Co(II) complexes.
For UV-Vis analysis, the Co(II) complexes showed two transitions, π→π* and n→π* transitions, which
indicated that the coordination between metal ions and dithiocarbamates ligands has successfully formed.
The presence of peaks above 400 nm confirmed the d-d transition of Co(II) complexes. Furthermore, mild
steel corrosion inhibition screening was studied using two corrosive media (1 M HCl and 1 M H2SO4)
with and without varied inhibitor concentrations. As the inhibitor concentration increased, the efficiency
of the corrosion inhibitor also increased at a constant temperature.
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