Evaluating the Corrosion Rates of Copper with and without

Abstract

The corrosion rates of copper were determined in presence and in absence ofdifferent compositions of water-ethanol, ethylene glycol, glycerol, dimethyl sulfoxide(DMSO) and dioxane binary mixtures. The rates of corrosion were found to decreaseby increasing the concentration of solvents. The percent inhibition range from 10.9 to78.2% depends on the nature of solvent and its concentration. The calculated energiesof activation prove that the reactions are diffusion controlled type. Thermodynamicparameters were calculated. The investigated adsorption isotherms indicate that proticsolvents fit the Langmuir model. The rate of corrosion of copper in presence of diaphragm is less than that in absence of diaphragm due to the prevention of stirring of hydrogen evolved at cathode. The overall mass transfer correlations under the presentconditions have been obtained using dimensional analysis method. The results agreedwith the previous studies of mass transfer to rotating cylinder in turbulent flow.