Abstract
The rate of oxidation of zirconium followed a cubic rate law in the temperature range 400°–900°C at oxygen pressures of 50, 200, and 800 mm. At 200 mm the activation energy was calculated to be .The oxidation of zirconium binary alloys containing 1, 2, and 4 atom % of aluminum, beryllium, carbon, chromium, cobalt, copper, hafnium, iron, lead, molybdenum, nickel, niobium, platinum, silicon, tantalum, tin, titanium, tungsten, uranium, and vanadium was studied at 700°C and 200 mm oxygen. For those additives which are soluble in zirconium the initial oxidation rates are explained by a valency effect; the breakaway phenomenon is explained in terms of a 15% deviation of the ionic radius from that of zirconium. X‐ray and electron diffraction studies indicate that for some alloys the breakaway coincides with a polymorphic transformation in the zirconium dioxide film.
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