Abstract
Corrosion inhibition of an amido-imidazoline derivative on API 5L X52 steel in CO2 saturated 3wt% NaCl solution was investigated. The effect of iodide ion additives was also studied by using electrochemical techniques. The results showed that amido-imidazoline derivative inhibited corrosion of steel and the extent of its inhibition was concentration dependent. Potentiodynamic polarization investigations revealed that amido-imidazoline acted as a mixed inhibitor showing anodic and cathodic behaviour. Furthermore, the inhibition efficiency of amido-imidazoline was enhanced by addition of iodide ions due to synergistic effect. It was also found that amido-imidazoline adsorbed chemically on the steel surface and followed the Langmuir adsorption isotherm.
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