Abstract
The dissolution behavior of metallic Pb plates in aqueous neutral sodium nitrate and ammonium nitrate solutions was investigated. Using a rotating disk method, the rate of dissolution was measured by weight changes in the disks for nitrate concentrations of 0.01–0.2 mol dm −3, at rotation speeds of 100–800 rpm and 60–90°C. In ammonium nitrate solution, the dissolution rate was mainly determined by the chemical reaction at temperatures higher than 60°C and by NH 4NO 3 at concentrations higher than 0.05 mol dm −3. The dissolution rate in NaNO 3 solution was much slower than that in NH 4NO 3 solution. X-ray photoelectron spectroscopy analyses showed the formation and compositional differences of a passive oxide layer containing nitrogen compounds on the lead surface in both nitrate solutions.
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