The electrochemical behavior of copper and copper-nickel alloys in synthetic sea water.

摘要

The goal of this work was to investigate the mechanism(s) of erosion-corrosion of copper and copper alloys in high velocity synthetic sea water environments. An impinging jet cell was designed to provide a platform where specific modes of enhanced corrosion could be isolated. A novel galvanostatic impedance technique was developed to collect impedance spectra without disrupting the temporal evolution of the system. A measurement model technique was applied to the impedance spectra to predict the polarization impedance and filter inconsistent data. The effect of velocity, pH, aeration, and applied potentials on the corrosion behavior of copper and copper alloys was investigated using electrochemical impedance spectroscopy, corrosion potential monitoring, and analysis of digital image captures.;A video microscope was used to provide a visual record of the electrode surface which could be used to determine shear-induced enhance corrosion. Results were compared with reported values and mechanisms for enhanced corrosion of previously reported work were proposed.