Calcareous deposits that formed in natura) seawater upon ASTM'' A710 (UNSI2) K20747) steel polarized either potentiostatically, galvanostatically, or by a mixed-mode technique (initially galvanostatic followed by potentiostatic) have been studied. Parameters investigated included variation of current density (potentiostatic control) or potential (galvanostatic control) with time, total charge transfer, deposit thickness, thickness-to-charge ratio, deposit morphology, and deposit composition. Based upon these parameters, the mixed-mode technique was judged to provide the deposit with greatest protective properties within the time frame of the experiments. This may be related to the nature of the initial, magnesium-rich film established during he preliminary experimental period; the mechanism of calcareous deposit formation is discuseed within this context.
The augmentation of a ballistic process, based on the well known solid propellant burning by an electrothermal (ET) energy source, is the subject of an experimental and theoretical investigation to obtain improved launching techniques. The plasma jet formation method, the internal ballistics modeling approach and the experimental test bed are described. Experimental results are disclosed showing the enhanced burning rate of a solid propellant ignited and augmented by the injection of plasma jets. We also present preliminary experimental evidence of improved performance of the new proposed method over that of conventional ballistics using solid propellant alone.
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