The electrochemical behaviour of zinc electrode corrosion in hydrochloric acid solution

Abstract EN

The effect of 4-amino-2, 3dimethyl-1-phenyl 3-pyrazoline 5-one inhibitor at various concentration on the electrochemical corrosion of zinc electrode in o.1 mol dm-3 aerated hydrochloric acid solution at over temperatures range from 293.15 K to 313.15K was studied using Potentiostat technique.

The percentage of protection efficiencies were decreased with increasing the various concentration of 4-amino- 2,3dimethyl-1-phenyl 3-pyrazoline 5-one inhibitor and with increased the temperatures.

Thus, the accelerating effect of the extent of 4-amino-2,3dimethy l-1- phenyl 3-pyrazoline 5-one inhibitor concentration was noticed when the corrosion current densities (icorr.) became higher as compared with corrosion current densities in the absence of inhibitor.

The kinetics of the corrosion followed Arrhenius type rate equation.

The compensation effect were discussed according to the linear relationship between the values of Log A and the corresponding values of Ea.

Furthermore, The values of the thermodynamics quantities (ΔG, ΔH, ΔS) were estimated and discussed to enhanced the corrosion inhibition process.