Review of liquid metal corrosion issues for potential containment materials for liquid lead and lead-bismuth eutectic spallation targets as a neutronsource

Lead (Pb) and lead-bismuth eutectic (44Pb-56Bi) have been the two primary c andidate liquid metal target materials for the production of spallation neu trons. Selection of a container material for the liquid metal target will g reatly affect the lifetime and safety of the target subsystem. For the liqu id lead target, niobium-1 wt% zirconium (Nb-1Zr) is a candidate containment material for liquid lead, but its poor oxidation resistance has been a maj or concern. In this paper, the oxidation rate of Nb-1Zr was studied based o n the calculations of thickness loss resulting from oxidation. According to these calculations, it appeared that uncoated Nb-1Zr may be used for a i-y ear operation at 900 degrees C at P-O2 =1 x 10(-6) Torr, but the same mater ial may not be used in argon with 5-ppm oxygen. Coating technologies to red uce the oxidation of Nb-1Zr are reviewed, as are other candidate refractory metals such as molybdenum, tantalum, and tungsten. For the liquid lead-bis muth eutectic target, three candidate containment materials are suggested, based on a literature survey of the materials' compatibility and proton irr adiation tests: Croloy 2-1/4, modified 9Cr-1Mo, and 12Cr-1Mo (HT-9) steel. These materials seem to be used only if the lead-bismuth is thoroughly deox idized and treated with zirconium and magnesium. (C) 2000 Elsevier Science S.A. All rights reserved.