Abstract
By means of a vacuum microbalance, the rates of oxidation of pure tin have been determined over a temperature range of 150°–220°C, and for several different pressures of oxygen in the range of 10−3 mm to 500 mm Hg. For oxygen pressures of 1 mm and above, the oxidation appears to proceed with time in three stages: (a) initially, the rate is low, but it increases to a maximum; (b) it then decreases and follows a direct logarithmic relationship; and (c) finally, for long times and thick films, the rate becomes erratic, either increasing rapidly or leveling off. Below an oxygen pressure of 1 mm, the oxidation rate increases continuously with time, and the rate‐determining step in the kinetic process appears to be the dissociation of oxygen.
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