In this study, a series of benzotriazole
derivatives with various
carbon chains (n = 1, 3, 4, 6, 7, 9, 10, 12, 16)
were synthesized for the corrosion inhibition of copper in 3.5 wt
% (wt %) NaCl solution. The corrosion inhibition efficiencies of these
inhibitors in 3.5 wt % NaCl solution for copper were measured by various
measurements including the polarization curves, the electrochemical
impendence spectroscopy as well as the weight loss method. The inhibition
mechanism of these new target molecules were analyzed by the plots
of Tafel, Nyquist, and Bode. The corrosion inhibition effect was also
evaluated by scanning the copper surface with an electron microscope.
The results show that the corrosion of copper in chloride aqueous
solution is efficiently inhibited by these new organic inhibitors.
Furthermore, the corrosion inhibition efficiencies of the target inhibitors
are shown to have much dependence on the carbon chain length attached
to the molecular backbone. The inhibitor carrying a 7-carbon chain
displays the greatest inhibition efficiency as large as ∼98%
at 0.15 mM, while even the poorest inhibitor containing a 2-carbon
chain shows ∼60% inhibition efficiency. The adsorption of these
new inhibitors on copper was further revealed by analysis of Langmuir
isotherms and quantum chemical calculations.
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