Corrosion Monitoring in Waste- To-Energy Plant and the Corrosion Evaluation Sistem

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1. The corrosion rates of 31 Ni-base alloys were monitored in three different melts (Na_2SO_4-K_2SO_4-ZnSO_4, NaCl-KCl-LiCl-CaCl_2, NaCl-KCl-Na_2SO4-K_2SO4-ZnSO_4) at 450,500 and 600ﾟC using AC Impedance method. From the monitoring data, the effects of alloying elements on the corrosion resistanace of Ni-base alloys in these melts were clarified.2. The corrosion monitoring of SUS304 was carried out in the mixtures of molten salt (NaCl-KCl-Na_2SO4-K_2SO4-ZnSO_4) and Al_2O_3 particles (diameter : 60mum) at 600ﾟC.The corrosion rate indicated a maximum around 70% Al_2O_3 content. The corrosion mechanism was clarified in the embedding test.3. The impedance characteristics of SUS304 were measured using ashes of two waste incinerators at 500-800ﾟC.Form the high frequency (10kHz) impedances, we can get the melting point of the salt which is present in the ash. The low frequency (10mHz) impedance provides the aggressiveness of the ash.4. The probes for corrosion monitoring in waste incinerators were designed, and the corrosion monitoring by AC impedance method started in November, 1996 in a municipal waste incinerator in Koutou-ku, Tokyo. The obtained monitoring data indicated that the corrosion monitoring is possible in actual waste incinerators.