Abstract
The mechanism by which tin is chlorinated to form stannic chloride has been studied at the temperatures of 423 and 473 K in a 10 : 1 volume ratio of dry air-chlorine gas. It has been observed that, initially, tin undergoes both oxidation and chlorination, with chlorination being much faster than oxidation. Formation of oxide and chloride scales on the surface results in a steady state weight loss before chlorination of volatile species proceeds exponentially. The rate of metal loss for the process is mathematically described as: wt-% loss/dt = k 1/t + k 2/y + k 3, where k 1, k 2 and k 3 are logarithmic, parabolic and linear rate constants which apply to early stage film formation, diffusion control and surface reaction, respectively.
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