Raman and Infrared Spectroscopy of Aqueous Corrosion Films on Lead in O.1 M Sulfate Solutions

摘要

This report contains the manuscript of a paper submitted for publication in the Journal of the Electrochemical Society. The Pb-H20-SO4 Pourbaix diagram was investigated by examining potentiostatically oxidized lead samples using Raman and infrared spectroscopy. In 0.1 M sulfate solutions surface film compositions were not in complete agreement with predictions of the calculated potential -pH diagram. The Pourbaix diagram did not predict the formation of PbO under any conditions; however, spectra indicated the presence of the oxide at certain potentials in acid and neutral solutions and at all potentials above the immunity region in basic solutions. Spectroscopic identification of insoluble surface species was in agreement with potentiodynamic polarization curves. (Author)