Accession Number : ADA266448

Title :   Investigation of the Influence of Applied Potential on Erosion-Corrosion of Copper in Alkaline Chloride Solutions.

Descriptive Note : Final rept. 1 Dec 86-31 Mar 93,

Corporate Author : FLORIDA UNIV GAINESVILLE DEPT OF CIVIL ENGINEERING

Personal Author(s) : Orazem, Mark E.

Report Date : MAY 1993

Pagination or Media Count : 139

Abstract : A novel electrochemical cell incorporating a scanning ellipsometer was designed and used to investigate the hypothesis that the critical shear observed for the erosion-corrosion of copper was associated with a shear-induced removal of protective film. While high-shear flow was shown to increase the rate of corrosion of copper in aerated and de-aerated saline solutions, ellipsometry indicated that shear induced removal of protective films did not take place, even for shear stresses ten times the reported critical shear for erosion-corrosion of copper. Subsequent work showed that a differential mass transfer mechanism could generate localized corrosion, but the visual appearance of the surface did not resemble classical products of erosion-corrosion. Separate potentiodynamic and impedance experiments were conducted to identify the electrochemical behavior, and new techniques were developed to interpret impedance spectra. Papers resulting from this work are attached

Descriptors :   *COPPER, *CHLORIDES, *ALKALINE EARTH METALS, *CORROSION, *EROSION, *PROTECTION, *FILMS, TRANSITION METALS, ELECTROCHEMISTRY, SCANNING, ELLIPSOMETERS, SHEAR STRESSES, REMOVAL, SALINE SOLUTION, AERATION, MASS TRANSFER, SURFACES, IMPEDANCE, SPECTRA, MODELS, SEA WATER CORROSION, ELECTROLYTES, INTERFACES.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE