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Synopsis: An automatic apparatus has been developed for isolation of precipitates and inclusions from steels. The developed apparatus is mainly composed of a sample exchanger, an electrolytic cell, a potentiostat, solution-jectors, ultrasonic vibrations and a program timer. Steel samples in the twelve electrolytic cells on the turntable are potentiostatically electrolyzed one by one in the non-aqueous electrolyte, 10% acetylacetone-1°A tetramethylammonium chloride-methylalcohol, provided by one of the solution-jectors. Electrolysis is performed by the highly precise potentiostat with the built-in coulometer until the predetermined weight of samples is dissolved. The precipitates dispersed in the electrolyte are collected with an organic microfilter and those on the sample surface are subjected to ultrasonic vibration generated by combination of horn-typed vibrator and ring-typed one. The developed apparatus is automatically operated by the program timer. Time required for twelve samples was about ten hrs. and repeatability of the results was better than those by a manual method. Analytical results of A1N, Cr7C3 and MnS by the proposed automatic apparatus are also discussed.

An Automatic Apparatus for Isolation of Precipitates from Steels