Collect. Czech. Chem. Commun. 1993, 58, 2003-2012

Effect of the Molecular Structure of Cyanine Dye on the Electrochemical Corrosion Behaviour of Metallic Copper in Nitric Acid Solution

Mohamed Th. Makhlouf and Zarif H. Khalil

Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt


The effect of 2-(2-hydroxystyryl)quinolinium-1-ethyl iodide (I) and 4-(2-hydroxystyryl)quinolinium-1-ethyl iodide (II) cyanide dyes on the corrosion behaviour of copper metal in nitric acid solution has been studied. Weight loss measurement, galvanostatic polarization curves, open-circuit potential variation of copper electrode with time and the cathodic protective current values indicate that cyanine dye I gives better anticorrosive effect than dye II. The inhibition effect in case of the two cyanine dyes is more pronounced in case of the addition of dye to the corrosion medium than that obtained in case of copper metal coated by dye thin film (previously treated in dye solution) before immersion in corrosive medium.