Abstract
Corrosion inhibition of carbon steel in dam water by sodium heptane sulphonate (SHS) and zinc ion system was investigated using weight loss and potentiodynamic polarization methods. Results of weight loss method indicated that inhibition efficiency (IE) increased as the inhibitor concentration increased. A synergistic effect existed between SHS and Zn 2+ . The influence of sodium potassium tartrate (SPT) on the IE of the SHS-Zn 2+ system was evaluated. As the immersion period increased, the IE decreased. Polarization study revealed that SHS-Zn 2+ system functioned as a cathodic inhibitor. AC impedance spectra revealed that a protective film was formed on the metal surface. The nature of the metal surface was analyzed by FTIR spectra, SEM and AFM analyses.
Highlights
Natural water is frequently used in cooling systems
The present work is undertaken to evaluate the inhibition efficiency (IE) of sodium heptane sulphonate (SHS) – Zn2+ system in controlling corrosion of carbon steel immersed in dam water in the absence or presence of Zn2+ by weight loss method; to investigate the influence of immersion period on the IE of the system; to analyze the protective film by FTIR spectra, fluorescence spectra, Scanning Electron Microscope (SEM), and Atomic Force Microscope (AFM); and to propose the mechanism of corrosion inhibition based on the above results
The present study leads to the following conclusions: The inhibition efficiency (IE) of SHS in controlling corrosion of carbon steel immersed in dam water in the absence and in presence of Zn2+ has been evaluated by weight loss method
Summary
Natural water is frequently used in cooling systems. Cooling water circuits may present several problems. The present work is undertaken to evaluate the inhibition efficiency (IE) of sodium heptane sulphonate (SHS) – Zn2+ system in controlling corrosion of carbon steel immersed in dam water in the absence or presence of Zn2+ by weight loss method; to investigate the influence of immersion period on the IE of the system; to analyze the protective film by FTIR spectra, fluorescence spectra, Scanning Electron Microscope (SEM), and Atomic Force Microscope (AFM); and to propose the mechanism of corrosion inhibition based on the above results. The carbon steel samples immersed in blank solution and in the inhibitor solution for a period of one day were removed, rinsed with double distilled water, dried and observed under a scanning electron microscope to examine the surface morphology. The carbon steel specimen immersed in blank and in the inhibitor solution for a period of one day were removed, rinsed with double distilled water, dried and subjected to the surface examination. The biocidal efficiencies of the formulation consisting of the inhibitor in the presence of various concentrations of SDS were calculated
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