Aging of Pyrotechnik Compositions. The investigation of chemical changes by IR spectroscopy and x‐ray diffraction

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Abstract
The aging of tracers, containing different amounts of Mg, Sr(NO3)2, KClO4, Al‐Mg alloy and organic binder, was conducted under the conditions of 50.0% and 98.5% relative humidities at 75 °C, and of 98.5% relative humidity at 25 °C. IR spectroscopy and X‐ray diffraction were used for investigation of chemical changes. At the lower humidity no detectable changes were observed. Tracer of metauoxidant ratio >1 exhibits decreased stability, changing significantly under the conditions of higher humidity, even at room temperature. In the reaction sequence of aging process (Mg(OH)2) and SrCO3 are formed, with concomitant decrease in Mg and Sr(NO3)2 content. Alloy changes only slightly, and the content of KClO4 and binder remains unchanged. Interaction between metal and nitrate is considered to be essential in the process of chemical aging.