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Effects of ethanolamine and ethylamine on the entropy content of the corrosion of galvanised steel in 1mol/l NaCl solution

A.I.Onuchukwu, I.A.Akpan, N.O.Offiong

The influence of ethanolamine and ethylamine on the corrosion behaviour of galvanised steel in 1mol/l NaCl solution was investigated at room temperature (25oC) by weight loss method. Results obtained show that the compounds are better inhibitors at low concentrations (<0.5mol/l). From the decreasing weights of the metal over time, the concentrations of the metal was evaluated and plots of logarithm of the concentration of metal versus time as well as Erying-type equations facilitated the access of thermodynamic parameters such as equilibriumconstant (k), enthalpy (“H*) and entropy (“S*) of the corrosion process. The entropy of the aggressive ions was found to have reduced on introduction of the inhibitors into the corrodent medium. Attempt to correlate the molecular structures of the inhibitors to the mechanism of inhibition was made.