Abstract
The effect of quinine (Q) and strychnine (S) on the corrosion of copper in sulphuric acid has been investigated using weight loss and polarisation methods. Q and S had a significant effect on the corrosion rate of copper, the maximum corrosion inhibition (99%) being observed with S at 10−3 M. The weight loss and polarisation techniques gave closely similar % inhibitive efficiency values for Q and S, the adsorption of which followed Bockris–Swinkels adsorption isotherm. The drift of the corrosion potential in the less noble direction, and the increase in the anodic Tafel slope, in the presence of inhibitors, suggest the inhibition of both the anodic and cathodic reactions of the corrosion process. The negative free energy of adsorption and the high degree of protection indicate a strong interaction between the inhibitors and the copper surface.
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