Abstract
Guanine inhibition of copper corrosion in 0.1 M HCl was characterized by electrochemical and weight loss experiments under hydrodynamic conditions as well as by Surface-enhanced Raman spectroscopy (SERS). Cyclic voltammetry and polarization measurements revealed that Guanine adsorption modifies copper surface, thus inhibiting its corrosion. Weight loss and electrochemical impedance experiments showed that Guanine has an inhibition efficiency (ξ) of ∼87 % and that its protection is maintained up to 333 K. SERS measurements revealed that neutral Guanine adsorbs on copper at a wide potential range, forming a Cu(I)Guanine complex at greater immersion times.
Published Version
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