Mu Guannan
2009
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Journal
Cleaning World
Abstract
The adsorption and inhibition effect of protocatechualdehyde(3,4-dihydroxy-benzaldehye) on cold rolled steel(CRS) in 1.0 mol/L HCl solution at 20~50℃ has been investigated by weight loss and potentiodynamic polarization methods.The results show that protocatechualdehyde acts a moderate inhibitor in 1.0 mol/L HCl,and inhibition efficiency increases with the inhibitor concentration,while decreases with the temperature.Polarization curves show that protocatechualdehyde is a mixed-type inhibitor in hydrochloric acid.The adsorption of protocatechualdehyde on CRS surface obeys the Freundlich adsorption isotherm equation.The experimental data have been treated with adsorption theory and kinetic Arrhenius equation.Three adsorption thermodynamic parameters(adsorption free energy ΔG°,adsorption heat ΔH°,adsorption entropyΔS°) and kinetic parameter of apparent activation energy Ea are also calculated.The inhibitive mechanism is discussed in detail according to the parameters.