Abstract
The kinetics of the dissolution of copper single crystals (100), (110) and (111) planes in 0.1 M H 2SO 4 containing various concentrations (10 −5 M to 10 −2 M) of strychnine have been investigated by weight loss and polarization techniques. The corrosion rate which was controlled by the surface reaction was found to be a function of crystallographic orientation, temperature and the concentration of strychnine. The stabilities of the crystal planes in uninhibited acid were in the order (111) > (100) > (110). At the critical concentration of strychnine the order of stability was found to be (100) > (110) > (111). The observed corrosion data indicated the inhibition of copper corrosion to be by surface adsorption of inhibitor molecules which followed the Bockris-Swinkels adsorption isotherm. The weight loss and polarization techniques gave similar inhibitor efficiency values. The order of stability of crystal planes is further confirmed by the observed surface topography and the thermodynamics of adsorption of inhibitor molecules.
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