Abstract
The effect of quinolines (5,6 benzoquinoline; 7,8 benzoquinoline) and acridine on corrosion of copper in sulphuric acid has been investigated by weight loss and polarization techniques at 303 K. These compounds when present even in traces had a significant effect in reducing the corrosion rate. The corrosion rate is a function of temperature, concentration and nature of the inhibitor. The percentage inhibitor efficiency (P) calculated from weight loss and polarization measurements were in good agreement with each other. The drift of corrosion potential towards more noble direction and the change in anodic Tafel slope in the presence of these compounds indicate that they act as anodic inhibitors during the corrosion process. Thermodynamic parameters for adsorption have been evaluated by using Bockris-Swinkels adsorption isotherm.
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