Photoelectrochemical and Microprobe Laser Raman Studies of Lead Corrosion in Sulfuric Acid

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Abstract
Microprobe laser Raman spectroscopy and photoelectrochemistry are two techniques which have recently been applied to the study of lead corrosion films. In this paper, we have used these techniques to study lead corrosion between 0.4 and 1.0V (vs. ) in , where lead oxides form beneath a film. Photoconductivity spectra were used to determine the bandgap energies of the lead oxides in situ during the constant‐potential corrosion. Cross sections of the corrosion films were then analyzed by microprobe laser Raman spectroscopy. In addition, open‐circuit potential decay curves of lead corrosion films were recorded. The results elucidate the mechanism of oxide film formation and explain discrepancies found in previous photoelectrochemical studies of lead corrosion.

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