Accession Number : ADA322107

Title :   Pulse Voltammetric Characterization of Biocorrosion Processes.

Descriptive Note : Final rept. 1 Feb 93-31 Jul 96,

Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF CHEMISTRY

Personal Author(s) : Osteryoung, Janet G.

PDF Url : ADA322107

Report Date : 21 FEB 1997

Pagination or Media Count : 7

Abstract : The work on anodization of copper electrodes for the first time presented a closed-form solution to the problem of relating the distribution of products of metal oxidation to the potential of the metal. In addition it presented a new method, based on normal pulse voltammetry at microelectrodes, for the determination of the stability constants of complexes, especially appropriate for the formation of chloride complexes in seawater. This work also identified and treated qualitatively the problem of coupled migration, diffusion, and complex formation in seawater. The work on thermoconvection provided a quantitative treatment of the effect of temperature differences on the rate of metal dissolution or deposition. Enhanced rates due to thermoconvenction are observed for both negative and positive gradients and the gradient has a strong qualitative influence on the potential dependence of the current. Thermal gradients are common in copper-containing equipment in contact with seawater. This work explains the consequence of such gradients.

Descriptors :   *PULSES, *VOLTAMMETRY, COUPLING(INTERACTION), METALS, STABILITY, CORROSION, BIOLOGY, DEPOSITION, SOLUTIONS(GENERAL), TEMPERATURE GRADIENTS, OXIDATION, COPPER, ELECTRODES, CHLORIDES, MIGRATION, SEA WATER, ANODIC COATINGS.

Subject Categories : Physical Chemistry
      Properties of Metals and Alloys
      Biochemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE