Inhibition Effect of Glutamic Acid on Copper Corrosion in 0.5 mol/L HCl Solution

The effect of glutamic acid(GLU) on copper corrosion in an aerated 0.5 mol/L HCl solution was studied by weight-loss measurements,potentiodynamic polarisation curves and electrochemical impedance spectroscopy.The inhibition efficiency(IE) increased with increasing GLU concentration and reached 73.7% at 1 mmol/L level of GLU.Polarization studies showed that GLU rendered the negative shift of corrosion potential and suppressed the cathodic corrosion reactions.