Copper corrosion inhibition in chloride solutions by 1,2,4-triazole and some of its derivatives

Research work on the inhibition of copper corrosion in chloride aqueous solutions by heterocyclic organic compounds, is in progress in this laboratory for several years. Various azole and thiazole derivatives, number of 1,2,3- benzotriazole substituted have been tested, whereas recently some interesting results with a series of tetrazole derivatives have been obtained. The present paper will discuss the results obtained in inhibiting the copper corrosion in neutral sodium chloride solutions at 25°C and 40°C by 1,2,4 - triazole and some of its derivatives, such as amino-, mercapto- and carboxylic substitutes. Weight loss measurements, polarisation resistance determinations, recording of the anodic and cathodic polarisation curves and the calculation of the anodic and cathodic overvoltages in correspondence of definite anodic and cathodic current density values, have been used to evaluate the efficiency of the tested additives. The recording of the FTIR reflection spectra on Cu electrodes in various experimental conditions allowed the authors to draw some conclusions about the action of the quoted series of compounds.