COORDINATION COMPOUND FILMS OF 1-PHENYL-5-MERCAPTOTETRAZOLE ON COPPERSURFACE

The chemical nature of the coordination compound film formed by reacti ng PMTA (1-phenyl-5-mercaptotetrazole) with a copper surface has been studied by accelerated corrosion tests, linear sweep voltammetry (LSV) , cyclic voltammetry (CV), Fourier-transform infrared spectroscopy (FT -IR), X-ray photoelectron spectroscopy (XPS) and Auger electron spectr oscopy (AES). These studies show that, in retarding the corrosion of c opper substrate, the film is superior to those formed by TTA (tetrazol e), BTA (benzotriazole), HBTA (hydroxybenzotriazole), MBT (2-mercaptob enzothiazole), MBI (2-mercaptobenzoimidazole), 2-AP (2-aminopyrimidine ), IBM (imidazole) and chromates. The surface film has been characteri zed and found to be a polymeric complex of Cu-PMTA. The mechanism for film formation and relationships between this novel film structure and the observed inhibition behavior are discussed. (C) 1998 Elsevier Sci ence B.V. All rights reserved.