Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C6H13SO3Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn2þ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn2+ system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).
:The inhibition efficiency of the aqueous extracts of the Chrysanthemum flower as an inhibitor for the Aluminium metal in the alkaline medium was tested using weight loss, potentiodynamic polarisation and AC impedance method. The results obtained showed that the flower extract acts as efficient inhibitor for the system. The inhibition efficiency increases with the increase in the concentration of the inhibitor. Potentiodynamic polarization study reveals that the system controls the cathodic reaction predominantly. The straight line obtained as a result of Langmuir and Temkin adsorption isotherm physical adsorption of the inhibitor on the metal surface. The nature of the film formed on the metal surface was analysed using Scanning Electron Microscope (SEM).
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