Corrosion Control by Aminoacetic acid (Glycine) an Overview
Glycine has the ability to control corrosion of various metals such as carbon steel, zinc, tin and copper. It behaves as an inhibitor in acid medium, neutral medium and in desecrated carbonated solution. Various techniques like weight loss method, polarization study and AC impedence spectra have been used to evaluate the corrosion inhibition efficiency of glycine. The protective film has been analysed by IR spectroscopy, atomic force microscopy, scanning electron microscopy and auger electron spectroscopy. Adsorption of glycine on metal surface obeys Langmuir, Flory- Huggins or Temkin isotherm, depending on nature of metal and corrosive environment. Polarization study reveals that glycine can function as anodic or cathodic or mixed type of inhibitor depending on nature of metal and corrosive environment.