The corrosion and passivity of high purity iron in anhydrous dimethoxyethane with 0.5M LiAsF6 have been studied by various electrochemical and surface analytical techniques. The motivations for this study were twofold; (i) to develop an understanding of the passivity of metals and alloys in anhydrous organic solutions at a fundamental level, and (it) to apply what is learned to improve the performance and useful life of high energy density lithium batteries which employ organic solvents. The data show that iron displays a stable passive region with low current densities over a large range of anodic potentials. Several different passivation mechanisms have been identified in this stable region. Among these mechanisms is passivation by solvent chemisorption. Our key finding is the observation of passivation by electropolymerization of the dimethoxyethane solvent. The polymerization reaction has not been observed when electrolytes other than LiAsF~ are used. Consequently, the potential at which breakdown of passivity occurs is lower in solutions containing alternative electrolytes. In addition, a bare oxide-free metal surface appears necessary for initiation of the electropolymerization reaction. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.173.72.87 Downloaded on 2015-06-22 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.173.72.87 Downloaded on 2015-06-22 to IP

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The Anodic Behavior of Iron in Anhydrous Dimethoxyethane and Passivation by Solvent Electropolymerization.-The corrosion and passivation behavior of pure iron in an anhydrous solution of 0.5 M LiAsF6 in DME is studied by various electrochemical and surface analytical techniques. It is found that iron has a stable passive region over a large range of anodic potentials in this solution. Several passivation mechanisms are identified, including the passivation caused by electropolymerization of DME. The polymerization reaction is not observed when electrolytes other than LiAsF6 are used. An oxide-free, bare metal surface appears to be necessary for the initiation of the electropolymerization reaction. -(SCANLON, J. F.; KRUGER, J.; MORAN, P. J.; J.