The effect of quinine (Q) and strychnine (8) on the corrosion of copper in sulphuric acid has been investigated using weight loss and polarisation methods. Q Introduction THE use of nitrogen-containing organic compounds as corrosion inhibitors is widespread. Despite the extensive use of inhibitors in preventing corrosion of metals and alloys, little is known of their function because of the complexity of the process. Several mechanisms have been proposed to explain the action of corrosion inhibitors of which the adsorption theory is the most pertinent.! Recently the nature of the action of corrosion inhibitors at the metal-solution interface has been evaluated by adsorption characteristics and also by the thermodynamics of adsorption. 2 -4 Selection of a suitable inhibitor for a given corroding system depends on the type of the corrosive medium,s the nature of the metal, the magnitude of the charge at the metal/ solution interface, and the cathodic reaction.
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