eco-friendly organic compound effect on the corrosion inhibition behavior of tin in alkaline environment

L-Cysteine (L-Cyst) was tested as corrosion inhibitor of tin in Na 2 CO 3 0.1M + NaCl 1M solution. The inhibition action of this inhibitor was studied by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques.  Temperature effect on the inhibition efficiency was studied in the range from 298 to 328 K and the values of activation thermodynamic parameters were calculated and explained. Experiment results show that inhibition efficiency increases with increasing of L-Cysteine concentration and decreases slightly with elevation of temperature. L-Cyst is a good inhibitor and inhibition efficiency reach 88% at 10 −3 M. Analysis of the polarization curves revealed that L-Cyst is considered as a mixed inhibitor. The results from electrochemical measurements and theoretical calculations are in good agreement. The surface morphology of the metal surface was investigated by scanning electron microscopy (SEM).