CORROSION INHIBITION BY AMINO ACIDS - AN OVER REVIEW

s. Gowry, J. Sathiyabama, S. Rajendran

Abstract


Amino acids have 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 carbonate solution. Various techniques like weight loss method, polarization study and AC impedance spectra have been used to evaluate the corrosion inhibition efficiency of amino acids. The protective film has been analyzed by IR spectroscopy, atomic force microscopy, scanning electron microscopy and auger electron spectroscopy. Adsorption of amino acid on metal surface obeys Langmuir, Flory-Huggins or Temkin isotherm, depending on nature of metal and corrosive environment. Polarization study reveals that amino acids can function as anodic or cathodic or mixed type of inhibitor depending on nature of metal and corrosive environment.

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DOI: http://dx.doi.org/10.17628/ecb.2012.1.470-476

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