The inhibition performance of a non-oxidising surfactant, namely cetyl trimethyl ammonium bromide (CTAB), and its co-adsorption behaviour with zinc ion on carbon steel in well water was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), weight loss, as well as atomic force microscopy (AFM) and scanning electron microscopy. Results indicated that the formulation acted as an anodic inhibitor. Adsorption of the used inhibitor led to a reduction in the double layer capacitance and an increase in the charge transfer resistance. A synergistic effect was also observed for the studied inhibitor with Zn 2+ in weight loss measurements and electrochemical studies.

The inhibition of corrosion of carbon steel in well water using diethylenetriamine penta (methylene phosphonic acid) (DETPMP), Zinc ions and dodecyltrimethylammonium bromide (DTAB) was investigated using weight-loss measurement, electrochemical polarization and impedance methods. Inhibition efficiency of above ternary inhibitor reaches maximum values at 93 %. The biocidal efficiency of DTAB was studied which reaches maximum of 88 % at 125 ppm DETPMP, 10 ppm Zn 2? and 150 ppm DTAB. The shape of DC polarization profile revealed the new ternary system which acts as anodic type inhibitor. AC impedance spectroscopic studies indicated the formation of a protective film onto the metal surface in the presence of inhibitors. Analyses of the protective film using scanning electron microscope, energy dispersive X-ray analysis, atomic force microscopy and Fourier transfer infrared spectroscopy have revealed that the film consists of Zn(OH) 2 , oxides and hydroxides of iron and the inhibitor molecules in the form of a complex.

The inhibition effect of amino trimethylene phosphonic acid (ATMP) and zinc ions on the corrosion of carbon steel in potable water distribution system was investigated. The corrosion inhibiting action was studied through weight loss, potentiodynamic polarization and AC impedance spectroscopy techniques. The possibilities of formation of protective complex was examined using UVvisible spectroscopy. The investigations revealed that zinc acts as an excellent synergist in corrosion inhibition. UVvisible spectral study indicates that there will be a possibility of formation of complexes of ATMP and Zn 2+ with carbon steel iron. Polarization studies indicate that the new binary system is a mixed inhibitor. Result of the impedance studies shows that a protective film is formed on the metal surface in presence of the inhibitor formulation.

Corrosion resistance of SS18/8 alloy, SS316L alloy, Gold18carat and Gold 22 carat in artificial saliva in the absence and presence of Erythromycin tablet 500mg has been evaluated by electrochemical study such as polarization study. For SS316L alloy, Gold 18 carat and Gold 22 carat, Polarization study leads to the conclusion that corrosion resistance of SS316L alloy, Gold 18 carat and Gold 22 carat decreases in the order : AS + Erythromycin > AS. Hence, people clipped with an orthodontic wire made of SS316 alloy, Gold 18 carat and Gold 22 carat can take Erythromycin tablet orally without any hesitation. For SS18/8 alloy, polarization study leads to the conclusion that corrosion resistance of SS18/8 alloy decreases in the order: AS > AS + Erythromycin. So, people clipped with an orthodontic wire made of SS18/8, should avoid taking Erythromycin tablet orally.

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