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Title
Japanese: 
English:METALLURGICAL STUDY ON ELECTRO-MAGNETIC FLOW METER AND PUMP FOR LIQUID LEAD-BISMUTH FLOW 
Author
Japanese: 近藤 正聡, 高橋 実.  
English: MASATOSHI KONDO, MINORU TAKAHASHI.  
Language English 
Journal/Book name
Japanese: 
English:Progress in Nuclear Energy 
Volume, Number, Page Vol. 47    No. 1-4    pp. 639-647
Published date 2005 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.pnucene.2005.05.067
Abstract Corrosion and precipitation of corrosion products at an electrode of an electro-magnetic flow meter and in a narrow channel of an electro-magnetic pump (EMP) for lead bismuth (Pb-Bi) flow was investigated by means of metallurgical analysis. The roughened surface of inlet pump core at the entrance of EMP flow channel was observed, which indicated the occurrence of the so-called corrosion/erosion. In the same time, corrosion products were precipitated on the surface of the electrode and the outlet pump core. Localized corrosion/erosion and precipitation of corrosion products were observed by means of SEM/EDX analysis for their cross sections. The surface condition was different from each other depending on the place. The precipitation products were made of double-layers, that is, an outer layer and an inner layer. The inner layer (diameter range of 0-20 ~tm) contained Fe in the fraction of 99wt%, and the outer layer (diameter range of 20-40 ~tm) contained Pb-Bi in the fraction of 10wt%. The double layer structure might be caused by difference of precipitation period. These lumps of the precipitation products could be the cause of the channel plugging.

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